Diagnostic trouble code (DTC) P2138 stands for “Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation.” It is triggered when the vehicle’s engine control module (ECM) or powertrain control module (PCM) detects that the signals from the two throttle position sensors (or two accelerator pedal position sensors) do
How do I fix code P2138?
What repairs can fix the P2138 code?
- Replacing the throttle body motor or throttle body assembly.
- Repairing or replacing wiring that is associated with the throttle body motor.
- Replacing the throttle position sensor.
- Repairing or replacing wiring that is associated with the throttle position sensor.
Can you drive with P2138 code?
We recommend addressing the issue causing P2138 as soon as possible. Your car may have trouble accelerating or go into reduced power mode when this code is triggered, which lets you know it’s not the best idea to drive with P2138.
How do you reset a pedal position sensor?
The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.
How do you know if your accelerator pedal sensor is bad?
SYMPTOMS OF A FAULTY ACCELERATOR PEDAL SENSOR: SYMPTOMS Increased engine idling speed. Vehicle does not respond if the accelerator pedal is pressed. Vehicle switches to “limp-home mode” Engine warning light in the cockpit illuminates.
How much does it cost to fix TPS?
What is this? The parts will cost you between $75 and $130 on average. The labor costs will be anywhere between $60 and $90, depending on the hourly rate of the mechanics. So in total, you can expect to pay between $135 and $220 for a throttle position sensor replacement.
How do I calibrate my accelerator pedal position sensor?
To recalibrate the ECM and accelerator pedal, the ignition switch must be in the ON position and then the accelerator pedal must be slowly and fully depressed from idle to full throttle. Repeat the procedure three times.
Where is the throttle position sensor?
The throttle position sensor is mounted onto the throttle body and measures the opening and closing movements of the throttle valve and these are transmitted to an engine control module, this information, as well as other measurements including; temperature, engine RPM and mass air flow (MAF), are used by the engine
What is the code P2135?
Diagnostic trouble code (DTC) P2135 stands for “ Throttle/Pedal Position Sensor/ Switch A/B Voltage Correlation.” This code appears when your car’s primary computer, which is often referred to as the powertrain control module (PCM), detects a problem with one of throttle and/or the pedal position sensors/switches.
What does the app sensor do?
APP sensor serves as a determiner and connector between the driver and the ECU – basically the brain of a vehicle. It signals the ECU to allow more air-fuel mixture ratio to the engine through the throttle body in accordance with the gas pedal position.
Can I drive with a bad throttle position sensor?
Can you drive with a bad throttle position sensor? It is not a good idea to drive with a bad throttle position sensor. Driving your car in this condition can be dangerous because your car might not accelerate properly or could suddenly accelerate without the driver pressing the gas pedal.
Will a bad TPS sensor throw a code?
a faulty tps can set a trouble code in the computer if the voltage value is either not present, sporadic, slow or constant, and this can illuminate your check engine light.
Can u clean a TPS sensor?
Cleaning the throttle body itself can be done using carburetor fluid and a clean cloth for the removal of light sludge. During this process, the throttle position sensor should not be cleaned due to the possibility of contamination or wire damage.
How much is an accelerator sensor?
An accelerator pedal position sensor on CarParts.com can cost anywhere between $3 and $700. The labor cost for replacing this part typically ranges from $50 to $70.
What causes accelerator failure?
Clogged or dirty fuel filter – A dirty filter, clogged with debris and other impurities will hinder the engine’s ability to receive the proper amount of fuel. If the fuel pump gives out or becomes clogged, it will be unable to supply fuel to the injectors and may result in poor acceleration, sputtering, or stall outs.
P2138: Throttle/Pedal Pos Sensor Voltage Correlation DTC
Are you at the end of your rope? You’ve already crossed your fingers and attempted to reset the computer in your vehicle, haven’t you? Do you believe that you have no choice but to Google “how do I solve difficulty code P2138?” Do you believe that you have no other option? Fortunately, you have arrived at our website, which has an overview guide that will assist you in not only understanding the P2138 error code and why the check engine light is up, but also in determining whether or not the problem can be resolved.
UnderstandingDrive by Wire
Firstly, it is crucial to understand how improvements in throttle design occurred throughout the 1990s, and how this has influenced vehicle design and functioning, before diving into the error code itself and its significance. Automobiles that existed before to the 1990s were very simple in design when compared to the computer-driven versions that are currently available. As an example, a direct cable connection between the throttle and the gas pedal used to be utilized to regulate the throttle.
Learning theMeaning of P2138
What does the code P2138 stand for, exactly? This is a diagnostic issue code that is referred to as a general powertrain code since it applies to all vehicle makes and models manufactured after the year 1996. Although this exact code refers to a problem with the throttle’s ability to open and close properly, it is not the only one that exists. While this code is the same across all makes and models, it is conceivable that it will be referred in a slightly different way depending on the manufacturer.
Watching for PossibleSymptoms and Causes
There are a number of possible warning signs or symptoms associated with this error code. One of the first things that will happen is that the check engine light will be on. This warning may be followed by a sudden reduction or lack of power when traveling at cruising speeds. In addition, the automobile may stall if you come to a complete stop while driving. It’s possible that you’ll have no acceleration or perhaps a jammed throttle. Furthermore, in addition to the various symptoms, there are a number of possible explanations for this type of error message.
Additionally, it is conceivable that the throttle body has been warped, resulting in difficulties with the rotation of the gears.
Another option is that one or more of the sensors failed, or that the throttle body itself malfunctioned completely. Additionally, it is possible that the engine management computer has failed.
A word of caution: the throttle control system is extremely delicate, and it is imperative that you handle everything with utmost caution. If you are not completely confident in your abilities, it is recommended that you take your automobile to a reputable technician for repair work. If, on the other hand, you decide to proceed, you should thoroughly examine all of the throttle body components, which are housed within the housing, before proceeding. The accelerator pedal sensor is the only component that is not part of the body.
Replace whatever that has to be replaced.
Unfortunately, because the electronic throttle system is extremely susceptible to damage, resolving the issues that result in such a code frequently necessitates the assistance of a professional technician.
P2138 code – Diagnose and Fix It Like a Mechanic
It appears that your Check Engine light is illuminated, and you have a code P2138, which stands for “Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation.” What exactly does this mean? In this video, our technician deconstructs the P2138 code, its symptoms, which include poor acceleration and decreased power mode, and demonstrates how to identify the various causes so that you can determine what to do to clear the code on your vehicle. Now is a good time to watch:
Check Engine Light? Weak Acceleration or Reduced Power – Code P2138
Would you want to see more videos like this? To see hundreds of automotive diagnostic and how-to videos, please visit our video collection.
What is code P2138 and what does it mean?
Code P2138 is a sensor code for either the accelerator pedal position (APP) sensor or the throttle position (TP) sensor. In layman’s words, it’s an OBD2 code that’s set when one of the two sensors in your gas pedal fails to operate properly. APP (Accelerator Pedal Position) sensors are located on either side of the gas pedal, as shown by our mechanic in the video above (1:07). These sensors effectively function as fail-safes for one another in the event that one sensor produces an error signal.
It is vital to understand that these sensors will not all produce exactly the same data; rather, the data from each sensor must correlate with the data from the others and fall within a particular range.
If you notice a significant spike or dip from a single sensor, you’ll know which sensor is causing the P2138 code to be triggered.
Can I drive with P2138, or is it too serious?
We recommend that you fix the problem that is producing P2138 as soon as possible.
When this code is activated, your automobile may have difficulty accelerating or may enter reduced power mode, which serves as a warning that driving with P2138 is not a good idea.
What are typical P2138 symptoms?
Among the symptoms of the P2138 error code are:
- Your Check Engine light may be on
- You may be experiencing trouble accelerating
- And your Engine Reduced Power light may illuminate. Simply expressed, this signifies that your car’s computer (powertrain or engine control module) has placed your vehicle in a safe mode in order to minimize strong acceleration or high speeds since code P2138 was activated
What causes a P2138 code?
P2138 can be caused by a variety of factors, including:
- Failure, malfunction, or contamination of the APPorTP sensor
- An APP or TP sensor connection that is damaged, bad, loose, or not attached
- APP or TP sensor wiring or circuits that are faulty or damaged
- On the APP or TP sensor connection, the incorrect dielectric grease has been applied. A problem with the computer
How do I diagnose P2138?
- Use an ascan toolor code reader that graphs data to discover which APP sensor is causing P2138 to be triggered.
While the engine is running and the vehicle is in Park, softly push the gas pedal while keeping an eye on the graph on the scan tool to ensure that the data does not drop or spike dramatically (1:59 in the video above). If there is a spike or a dip in the data, you will know that something is amiss with that specific sensor. The sensor may not be functioning properly because it is dusty or has a poor connection, in which case the pedal will need to be replaced entirely. Certain scan tools feature an option called “Agree or Disagree,” which tells you if the data from the two APP sensors “agrees” or “disagrees,” depending on the situation.
If the data changes, it suggests that the problem is with the pedal itself, rather than with the sensor cables that connect it.
- Make a visual inspection of the APP sensor connector and wires for damage, fraying, or disconnection, as well as the use of the incorrect dielectric grease.
Verify that the APP sensor connector is securely attached, and check the sensor wires for fraying or other signs of wear and tear (2:54). Alternatively, you may observe the data being graphed while wiggling the wires to see if the data changes, which would suggest that a wiring or connection issue is causing P2138. Unplug and thoroughly inspect the connection (3:13), looking for corrosion in the terminals and any frayed or loose wires, which you may double-check by gently pulling on the wires.
Make sure there isn’t any dielectric grease on the connecting terminals as well.
Only low-voltage dielectric grease should be used on this connection because of its high sensitivity to voltage.
- Check the sensor connector wire using a multimeter to see if there is a break in the wiring.
Examine the sensor connector wires for breaks that might result in the P2138 code being triggered using a multimeter and setting the meter dial to the ohms setting (which our mechanic described as appearing like a little horseshoe). In the video above, at 4:03, our mechanic demonstrates how to accomplish this.
- Test the sensor and pedal connector terminals using a multimeter to see if any wires are defective or damaged.
Using a tiny flat-edged instrument, such as a screwdriver, carefully pry the covers off of both connections while the ignition is turned off first (5:11). Beginning at 5:36, our mechanic demonstrates how to test the APP sensor and pedal connector terminals with a multimeter. If one wire’s reading is much greater than another’s, this suggests that something is amiss with the circuit, and you should investigate more. To test a circuit, change the dial on the multimeter from ohms to direct current voltage.
In addition, be certain that your battery has 12 volts before doing this test.
If it isn’t at 12 volts, be sure you charge it before continuing. Starting at 7:00 p.m., our mechanic will teach you through how to do this test, which should assist you identify any potential wire breakage that need to be fixed.
How do I fix P2138?
If any of these tests reveal that the P2138 code is caused by a problem with a particular part or component, you will need to repair or replace that component or component (e.g. Replace theaccelerator pedalor one of the connectors, or repair faulty wires).
Video: How To Replace Accelerator PedalPosition Sensor
- Scan tool includes a “Agree or Disagree” option as well as graphing capabilities. Multimeter
- A screwdriver with a flat head
Need other parts mentioned in this article? Shop now:
- Sensors for the accelerator pedal position (APP) and the throttle position (TP).
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The P2138 code is a diagnostic and repair tool that may be used by mechanics to diagnose and repair a variety of problems. In this video, our mechanic explains the P2138 code (“Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation”) and demonstrates how to diagnose and repair it. The Author1A Auto TeamPublisher Name1A AutoPublisher Logo are trademarks of Author1A Auto TeamPublisher.
P2138 DTC Throttle/Pedal Pos Sensor/Switch D
Don Bowman contributed to this article. ASE Certified Automotive TechnicianThrottle/Pedal Pos Sensor/Switch D / E Voltage Correlation ASE Certified Automotive Technician
What does that mean?
This diagnostic problem code (DTC) is a general powertrain code that may be seen on many vehicles. Although particular repair processes may alter significantly depending on the model, it is called general since it applies to all makes and models of automobiles manufactured after 1996. It is possible that the throttle will not open and shut properly if the throttle/pedal position sensor/switch D/E voltage correlation is set in the automotive trouble codeP2138. In the 1990s, vehicle manufacturers began using “Drive by wire” throttle control technology on a large scale across the industry.
Previously, the vehicle’s throttle was operated by a simple cable that connected the gas pedal directly to the throttle.
When the throttle is moved or positioned, the TPS transforms it to a voltage signal, which is then sent to the engine management computer, which utilizes the fluctuating voltage signal to formulate an engine management plan.
Although the code has the same frame of reference as the other codes, the wording on certain manufacturers is significantly different, such as “Throttle position sensor circuit range/performance” on an Infiniti or “Electronic throttle control system malfunction power management” on a Hyundai, for example.
- As a result, the computer transmits a voltage to the electric motor, which causes the throttle plate to be released.
- An illustration of a throttle body; the throttle body position (TPS) sensor is shown in the lower right corner of the image.
- When both voltages are in agreement, the system is in proper working order.
- Additional difficulty codes may be generated in conjunction with this code, which will help to pinpoint the source of the problem.
- Here is a shot of an accelerator pedal, complete with sensor wire attached to its surface: Panoha (Own work) provided permission for use of his photograph, which was obtained from Wikimedia Commons.
NOTE: Because this P2138 DTC is essentially the same as the P2135, P2136, P2137, P2139, andP2140 codes, the diagnostic procedures for all of them will be the same.
The symptoms of a P2138 code might include stalling when you come to a complete stop, absolute lack of power, no acceleration, rapid loss of power at cruise speeds, and a locked throttle at the present engine rpm, among others. In addition, the check engine light will illuminate, and a code will be assigned to indicate the problem.
Potential Causes of P2138 DTC
- Slight stalling as you come to a halt, complete lack of power, no acceleration, rapid loss of power at cruise speeds, and locked throttle at current rpm are all possible symptoms of the P2138 code. Additional to this, the check engine light will illuminate, and an error message is shown on the dashboard.
Diagnostic / Repair Steps
Here are a few items to consider with the electronically controlled throttle. This system is more delicate and subject to damage than any other system, and it is also the most expensive. Treat it and all of its components with utmost caution. It only takes one spill or one harsh treatment to make it unusable. The throttle body contains all of the other components, with the exception of the sensor for the accelerator pedal. When you look closely at the throttle body, you will discover a flat plastic cover on the top of it.
The motor is equipped with a tiny metal gear that protrudes from the housing behind the cover.
The centering and supporting pin for the gear is inserted into the throttle body housing, while the top pin is inserted into the “thin” plastic cover.
- The first step is to go online and look for the TSBs (technical service bulletins) for your car that are related to the code you received. These Technical Service Bulletins (TSBs) are the outcome of consumer complaints or acknowledged defects, as well as the factory advised repair process. Consult an online service handbook or a computer repair manual for information on a possible relearn technique to reset the machine. For example, on a Nissan, start the engine and wait three seconds before continuing. Pushing and releasing the pedal five times in succession during the following 5 seconds will count as one rep. Ten seconds after pressing the pedal, release it and hold it for another seven seconds. Release the accelerator pedal when the check engine light begins to blink. Wait 10 seconds, then depress the pedal for another 10 seconds before releasing it. Remove the key from the ignition
- Remove the electrical connector from the throttle body by pulling it out. Take a close look at it to see if there are any missing or twisted female terminals. Look for signs of corrosion. Using a little pocket screwdriver, remove any rust that has formed. Connect the wires by putting a little quantity of electrical lubricant on the terminals and reconnecting them. You may get a replacement “pigtail” at most auto parts stores or from the dealer if the terminal connector has been twisted or has missing pins, and you should check the top cover of the throttle body for cracks or warping. If any are present, contact the vendor and inquire as to whether they offer only the top cover. n If this is the case, the throttle body should be replaced. Probe the accelerator pedal sensor with a voltmeter to determine its voltage. It will have a reference voltage of 5 volts and a changing signal adjacent to it. Start by turning the key in the ignition and carefully depressing the pedal. The voltage should gradually increase from.5 to 5.0 without interruption. If the voltage spikes or if there is no voltage at the signal wire, it should be replaced
- Look online for the wire terminal identification on the throttle body of your car, which may be found on the throttle body. Check for power to the throttle motor by probing the throttle body connector. Helper should turn the key on and softly push the accelerator pedal. If there is no power available, the computer is at fault. If there is power, this indicates that the throttle body is faulty.
Other DTCs associated with the throttle include: P0068, P0120, P0121, P0122, P0123, P0124, P0510, and more.
Related DTC Discussions
- P2138 throttle/pedal positioning sensor switch d/e voltage correlation is a Nissan Titan code that appears in 2006. A p2138 error code was shown on my 2006 Nissan Titan, which had 128000 miles on it. I tried changing the throttle body, but nothing worked
- I tried changing the acceleration pedal, but nothing worked
- I hit a pothole while driving, and the engine light came on, giving me a p2138 throttle/pedal positioning sensor switch d/e voltage correlation
- I tried changing the throttle body, but nothing worked. Code P2138 for the 2007 Grand Prix. Greetings to everyone. I have a 2007 Pontiac Grand Prix with a sunroof, and the vehicle is displaying the code P2138. Apparently, this has been going on for about a year now. When driving in heavy rain or extremely slick road conditions, the Reduced Engine Power warning will appear along with the check engine light on the dashboard. This only occurs when the da is wet, and never when the da is dry. Trailblazer P2135, P2138, P300, P303 (2004 model year) I’m experiencing some issues with my 2004 Trailblazer and am hoping that someone can put me in the correct route to resolve the situation. I’ve had the truck for nearly 2 years and have had no problems with it at all. It’s been a fantastic vehicle to drive. Approximately three weeks ago, I pulled out of the driveway and noticed a dash light that said “Reduced
- 2018 Silverado DTC P2138 – Stranded three times so far.” For the first time, I replaced the accelerator pedal with a sensor. The ECM was replaced for the second time. So, what do you do now? Is it necessary to replace the throttle body and its sensors? Is there anyone who can assist me?
- P2138 decreased the number of engine difficulties My check engine light is illuminated, and it indicates that the engine power has been lowered. I adjusted the gas pedal because the codes said p2138. Is there anything else I need do after I’ve cleared the codes but before I start the vehicle? I’m aware that some cars must perform specific tasks in order to ensure that the environment is clear and safe before starting their vehicles. Thank you so much
- Acura TL Error Codes from 2006 P0134 P2251 P2138 P0134 P0134 P0134 Acura TL (3.2) from 2006
- There is no Sports Package with this vehicle. I was having some automotive issue
- When I squeezed the gas pedal, my car barely moved at all. I took it to Auto Zone, and the codes that were displayed were as follows: Misconfiguration of the HO2S (B1) S1 Heather System, code P0134 (No Activity) Circuit with a high voltage sensor (P2251 A/F Sensor S1 V?r) Trailblazer p2138 code
- P2138 application I have a 2005 Trailblazer with the numbers p0641, p2138, and p2135 on the dashboard. My accelerator pedal, throttle body, and new wires from the throttle body have all been replaced
- Nonetheless, the vehicle is still in limp mode. Do you have any other suggestions? The following pilot 2005 numbers: P0137, P2138, P0300, P0302 through P0306 Hello, In the last few months, we’ve had a number of problems with our 2005 Honda Pilot. I went out and bought an OBD reader, and the following codes were shown (the majority of which were cylinder misfires): P0137 O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 P0137 O2 Sensor Circuit Low Voltage P2138 Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation P2138 Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation Code P2138 on a 2009 Chevrolet Impala with the P03 code. My 2009 Chevrolet Impala suffered “traction control not functional” for almost 1 mile, resulting in a significant loss of power. The “P2138” code was stored when I shut off and restarted the engine, however it was cleared after around 50 miles. Everything has returned to normal. What am I supposed to do? What should the dealer do in this situation? This is an example of
- P1125, P2138, and P2125 are the base model codes for the 2006 Pontiac Grand Prix. Hello, I’ve been experiencing problems with my 2006 Pontiac Grand Prix, which has been throwing the codes listed above. Even though I’ve rebuilt the throttle body and the pedal assembly, as well as discovered some exposed wires in the engine compartment (which I repaired), the problem continues to exist. Is there anything else that might be done to solve this?
Need more help with a p2138 code?
P2138 throttle/pedal positioning sensor switch d/e voltage correlation is a code that appears on the 2006 Nissan Titan. A p2138 error code was shown on my 2006 Nissan Titan with 128000 miles. It didn’t help that I struck a pothole while driving and the engine light came on, telling me that the throttle/pedal location sensor switch d/e voltage correlation was incorrect. I changed the throttle body, but it didn’t help, and I changed the acceleration pedal, but that didn’t help either. Code P2138 for the seventh Grand Prix.
- In my 2007 Pontiac Grand Prix with sunroof, the P2138 error number is shown.
- When driving in heavy rain or extremely slick road conditions, the Reduced Engine Power warning will appear along with the check engine light on the dash.
- Trailblazer P2135, P2138, P300, P303 (2004 model year).
- My truck has been in my possession for almost 2 years; I have experienced no difficulties and it has been a pleasure to drive.
- After a few attempts, I was able to successfully replace the accelerator pedal with sensor.
- The next step is to.
- Is there anything I can do to assist you?
The codes read p2138, and I modified the gas pedal to accommodate this information.
In my experience with particular vehicles, specific procedures must be followed in order to ensure that the road is clean and safe for them to drive.
Misfires on the 2006 Acura TL P0134 P2251 P2138 P0134 P0134 P0134 P0134 Acura TL (3.2), 2006 Acura TL There is no Sports Package with this vehicle.
The other day I was having automotive difficulty; when I squeezed the gas pedal, my car barely moved at all.
My accelerator pedal, throttle body, and new wires from the throttle body have all been replaced; nonetheless, the vehicle is still in limp mode.
The following P0137, P2138, P0300, P0302 through P0306 are pilot 2005 flight numbers: Hello, This year, our 2005 Honda Pilot has been causing us a lot of problems.
The “P2138” code was stored when I shut off and restarted the engine, however the code was removed after around 50 miles of driving.
And what should I do now, you ask?
I am referring to the following: Model codes P1125, P2138, and P2125 for the 2006 Pontiac Grand Prix base models.
I’ve rebuilt the throttle body and pedal assembly, as well as discovered and repaired several loose wires in the engine area, but the problem continues. Is there anything further that might be done to help?
P2138 Code – What Does this Mean & How to Fix
This is one of the most often encountered OBD2 error codes. Read the rest of this article to find out what it means, how to solve it, and what additional codes may appear that are associated with it.
The Diagnostic trouble code (DTC) P2138 is an abbreviation for “Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation,” which means “Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation.”
It is a Powertrain diagnostic problem code (DTC), which means it is a standard code. We consider it nonexclusive because it applies to all makes and models of automobiles manufactured from 1996 to the present, however the clear/fix procedures may differ depending on the model. An engine control module (ECM) or a powertrain control module (PCM) has detected a problem in the D or E circuits of the throttle /choke position sensor, resulting in the DTC-P2138 code being displayed. Alternatively, the P2138 error code might be defined as a fault with the throttle’s ability to open and close appropriately.
You can troubleshoot this code at home if you have a good comprehension and expertise of the subject matter involved. The following are the usual suspects for a P2138 code:
- Powertrain Control Module (PCM) or Engine Control Module (ECM) that is not functioning properly
- Difficulties with the circuit, such as corroded wires or inadequate connections There is an issue with the throttle position sensor. The electronic throttle body has been compromised. The accelerator pedal’s wiring or sensor has been compromised. The engine management computer has had a failure. The PCM system might be experiencing a problem, such as software that requires updating.
P2138 code symptoms might be detected whether a vehicle is in motion or when it is at a complete stop. What you’ll notice about a P2138 is as follows:
- At cruising speeds, there is a sudden reduction of power
- It is possible that the car will not accelerate properly (loss or lack of power)
- This will cause the check engine light to illuminate, and the code will be set. The throttle (at any RPM) has become stuck.
- At cruising speeds, there is a sudden drop in power. This might be due to a loss or lack of power in the vehicle’s acceleration. There will be an illuminated check engine light, and a code will be assigned. No response when the throttle is turned on (at any RPM).
- Set the dial of the multimeter to DC voltages at this point. Insert one terminal of the multimeter into the ground and another into a connector to confirm its operation and function. Check to see that your battery is 12 volts and that it is fully charged
- Put the automobile key in the ignition and turn it on, but do not start the vehicle. If the voltage is close to 5 volts, then everything is in working order.
Make sure the multimeter’s dial is set to “direct current.” Connect the multimeter’s black terminal to the ground and another terminal to the connection to verify it. Charge your battery and check to see if it has 12 volts. Do not start your automobile until you have placed the key in the ignition. If the voltage is close to 5 volts, then everything is in working order; otherwise, everything is not.
If you do not have a high-level output device and a computerized voltage scope with the proper connections, there is a slim chance that you will be able to resolve this exact issue on your own. You can consider about changing the “throttle position sensor” to see if it solves the problem. However, there is a possibility that the issues will persist. It is suggested that you have your car inspected by a professional.
How serious is this?
This is a really important mistake, and you should take it into consideration. If your automobile does not receive adequate acceleration, the power of your car’s engine may be reduced, and the car may eventually stall. To properly resolve this issue, it is highly advised that you take the appropriate steps.
What repairs can fix the code?
To fix your automobile, you should do the following things or follow the methods outlined below.
- Replacement or repair of one or both of the TP sensors is necessary. Repair or replacement of the throttle position sensor, as well as the cables that are connected to it
- Make a visual inspection of all of the wires that are connected to the accelerator pedal position sensor circuit and replace or repair them if necessary.
Replacement or repair of one or both of the TP sensors is required. Repair or replacement of the throttle position sensor, as well as any connected wiring. Make a visual inspection of all of the wires that are connected to the accelerator pedal position sensor circuit and replace or repair them if they are damaged.
P2138 is usually accompanied by other codes, and losing control of the throttle may be quite dangerous. Other error codes that are linked to this include:
- “Throttle/Pedal Position Sensor and Switch A/B Voltage Correlation.” “Throttle/Pedal Position Sensor and Switch A/C Voltage Correlation.” “Throttle/Pedal Position Sensor and Switch B/C Voltage Correlation.” “Throttle/Pedal Position Sensor and Switch E/F Voltage Correlation.” “Throttle/Pedal Position Sensor and Switch B/C Voltage Correlation.” “Throttle/Pedal Position Sensor and Switch E/
P2138 indicates a problem with the throttle/pedal position sensor/switch. The pedal position sensor/switch is extremely delicate and should only be handled with utmost caution at all times. If you do not have the necessary tools or training, it is suggested that you consult with a technician. Make certain you consult the owner’s handbook for this specific problem.
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Error Code P2138: Throttle/Pedal Pos Sensor Voltage Correlation DTC
Throttle/Pedal Pos Sensor Voltage Correlation DTC is what Error Code P2138 is stated as in the manual. This indicates that there is an issue with the throttle body’s ability to open and close correctly. It should be noted that this error code is a generic difficulty code, which means that it applies to any car equipped with an OBD-II system, particularly those manufactured from 1996 to the present. Of course, the specifications for the definition, diagnostics, and repairs differ from one make and model to the next depending on the manufacturer.
It is indicated by the Error Code P2138 that the PCM (powertrain control module, also known as ECM or engine control module in other car manufacturers) has discovered an issue with the D and E circuits of the TP (throttle position sensor). We press the accelerator pedal, which activates a sensor that measures the required amount of throttle opening, which is subsequently transmitted to the engine control computer (PCM). The computer then responds by sending a voltage signal to the electric motor, which causes the throttle plate to open.
The PCM keeps track of the relationship between the two voltages.
When they diverge for more than two seconds, the P2138 code will be recorded, and the Check Engine light will be on at the same time as the code.
Other error codes that are linked to this include:
- Error codes: P2135, P2136, P2137, error codes: P2139, error codes: P2140
- Error codes: P2135, P2136, P2137, P2139, and P2140
error codes: P2135, P2136, P2137, error codes: P2139, error codes: P2140; error codes: P2135, P2136, P2137, P2139, error codes:
This error code, like all other error codes, causes the Check Engine light to illuminate and the code to be stored in the vehicle’s memory system. Other frequent signs and symptoms are as follows:
- Slowing down as the vehicle comes to a complete halt
- At cruise speed, there is a lack of power or a rapid loss of power
- The throttle is stuck at its present RPM
- There is no acceleration.
The most common reason of this code is a bad connection in the connector or “pigtail” on the throttle body, which occurs in the majority of cases. In some cases, female terminals rust or peel away from the connection.
- Throttle body motor that is not working properly
- Damaged connector or wire related with the throttle body motor
- Faulty throttle position sensor
- Faulty PCM
- Faulty electronic throttle body The accelerator pedal or its wiring has failed.
How to Check
It is necessary to back probe the accelerator pedal position sensor as well as the tire pressure sensor with a scan tool or a multimeter to see the voltage output of each sensor in order to troubleshoot this code. In order to function properly, the voltage must be within the manufacturer’s standard range. Also utilizing the multimeter, they will check the ohm levels of the accelerator pedal position sensor and the throttle position sensor (TP sensor). Additionally, the readings must be within the manufacturer’s requirements.
They will also match the make and model of the vehicle to any applicable recalls and technical service bulletins (TSBs) to see if one has been issued and implemented.
If there are any other codes present, these other codes must be addressed first because they are components of the system and may be the direct cause of the P2138.
The connections and terminals will be inspected for signs of deterioration, such as corrosion, by the technicians. Cracks or warping in the top cover of the throttle body will also be checked for by the technicians.
How to Fix
The replacement of one or both TP sensors is required. The sensor for the location of the accelerator pedal must be replaced. A circuit (throttle position sensor circuit, accelerator pedal position sensor circuit) that has a problem, such as an open, a short, corroded wire, or a faulty connection, must be repaired. It is a major concern when the error code P2138 occurs, as unexpected stalling while driving can be dangerous, especially in heavy traffic or when making a turn.
P2138 Code: Throttle Position Sensor Issue (Causes and How to Fix)
The most recent update was made on December 15, 2021. Over the past few of decades, engine technology has progressed to a level that is considerably more advanced than anybody could have imagined possible only a few decades ago. Functions that were formerly controlled mechanically are now controlled by computers, boosting both the efficiency and precision of the system. Are you looking for a reliable online repair manual? The top five choices may be found by clicking here. In today’s engines, one of the functions that may now be handled electronically is the manipulation of the interior plate of the throttle body.
While systems of this sort are often constructed with care, they are not immune to the occurrence of a malfunction from time to time.
DTC P2138 is one of the most often encountered of these throttle body-related issues.
Also see: 10 Best Diesel Engines for the Twenty-First Century
What Does Code P2138 Mean?
P2138 is an OBD-II trouble code that has a description. The voltage correlation between the throttle/pedal position sensor and the switch “D”/”E” It is possible that the electronic throttle body in a vehicle is not reacting as expected to ECM/PCM input, as instructed by a signal from the accelerator pedal position sensor, resulting in the appearance of diagnostic error code P2138. For one to comprehend the implications of this predicament, one must first understand the workings of “drive-by-wire” throttle delivery, which is described in further detail below.
- There was a connection that led directly from the accelerator pedal to the engine’s throttle body.
- The classic throttle cable, on the other hand, is no longer used in today’s automobiles.
- Using this information, the PCM/ECM can calculate which signal should be sent to the engine’s electronic throttle body, resulting in the desired output.
- The presence of DTC P2138 indicates that the throttle plate on a vehicle is not oriented correctly in respect to the throttle requests made by the driver.
When a lack of correlation between a vehicle’s throttle position and accelerator position sensor is observed for more than two seconds at a time, this code is normally retained. DTC P0121, DTC P0122, DTC P2135 are all related.
Symptoms of Code P2138
When the P2138 diagnostic issue code is active, there are a variety of symptoms that are commonly seen. However, while the incidence of such symptoms frequently vary from one individual to the next, certain of these symptoms are significantly more prevalent than others. A few of the most frequent symptoms linked with DTC P2138 are listed in the next section.
- Vehicle has a check engine light on and an electronic throttle control light on
- It is stalling at various RPM ranges
- It has poor throttle response, it hesitates under acceleration, it has sudden loss of power and throttle response. idle that is rough or uneven
Causes of Code P2138
When the DTC P2138 is shown, there are a number of possible explanations, some of which are more prevalent than others. The precise root cause of such problems can also differ depending on a variety of factors, including the specific make and model of the car in question. The following are a some of the most often seen reasons of DTC P2138.
- Some of the most prevalent causes of DTC P2138 are listed below, with the most common being the following: There are a variety of elements that might influence the underlying cause of such problems, including the specific make and model of the vehicle under consideration. DTC P2138 can be caused by any of the following factors, which are the most prevalent.
Is Code P2138 Serious?
Some of the most prevalent causes of DTC P2138 are listed below, with the most common first. There are a variety of elements that might influence the root cause of such problems, including the particular make and model of the car in question. The following are some of the most prevalent reasons of DTC P2138 that you may encounter.
How to Fix A Code P2138
When attempting to identify and fix the root cause of diagnostic problem code P2138, the following procedures might be utilized as a basic template. In any case, one should always reference the factory-specific service documentation for their particular vehicle before performing any repairs.
1 – Check For Additional DTCs
It is critical to check for the presence of any additional diagnostic issue codes before proceeding with your diagnostic attempts. It is necessary to properly diagnose and correct the underlying cause of any additional codes that may be present before proceeding with the rest of the procedure.
2 – Check For TSBs
It is critical to check for the presence of additional diagnostic issue codes before proceeding with your diagnostic attempts. In order to proceed, it is necessary to properly identify and correct the root cause of any more codes that are present.
3 – Visually Inspect Throttle Body
You will now physically inspect the throttle body and wiring of your vehicle, paying close attention to any evidence of frayed or pinched wires, as well as any damage to the pins on either side of the throttle body connector. Make an effort to locate any damage to the throttle body housing itself that may be present on the vehicle.
4 – Relearn Throttle Body and Test
You will now physically inspect the throttle body and wiring of your vehicle, paying close attention to any evidence of frayed or pinched wires, as well as any damage to the pins on either side of the throttle body connector, before proceeding. Make an effort to determine whether there is any damage to the throttle body housing itself.
5 – Check Voltage Sweep at Accelerator Pedal
If the DTC P2138 appears again, use a multimeter to check the accelerator pedal of the car in question. Accelerator connectors should be back probed, and voltage readings between the sensor’s signal circuit and ground should be recorded between the accelerator connector and the ground.
The signal voltage should smoothly fluctuate between.5 and 5.0 volts while the vehicle’s key is in the “on” position while the accelerator pedal is steadily depressed while the key is in the “on.” If the signal values change in an irregular manner, it will be required to replace this sensor.
6 – Check Power at Throttle Motor
You will now back probe the power wire for your engine’s throttle motor to ensure that it is operational. In the throttle body wiring connector, you’ll find this wire connected to the throttle body. To begin, have an aide softly sweep down the accelerator pedal while the ignition is turned to “on” position. If the voltage fluctuates, it indicates that the torque converter is malfunctioning, and if there is no voltage, it indicates that the ECM/PCM is malfunctioning or that there is a “open” situation in the related signal circuit.
P2138 Throttle/Pedal Pos Sensor/Switch D/E Voltage Correlation – TroubleCodes.net
|Trouble Code||Fault Location||Probable Cause|
|P2138||Throttle position (TP) sensor/switch D/E – voltage correlation||Wiring, TP sensor/switch|
In order to test the throttle motor’s power line, you must first back probe it. When you plug in the throttle body wiring connector, you’ll see this wire there. Assuming the ignition is in the “on” position, have an aide gently sweep the accelerator pedal. If the voltage fluctuates, it indicates that the accelerator pedal is malfunctioning, and if there is no voltage, it indicates that the ECM/PCM is malfunctioning or that there is a “open” situation in the related signal circuit.
What Does Code P2138 Mean?
I’ve dealt with a stored code P2138 on several times and have discovered that it indicates that the powertrain control module (PCM) has identified a mismatch in the voltage signal between a certain throttle position sensor (TPS) and a specific pedal position sensor (PPS) (PPS). When you see the letters D/E, it refers to a specific circuit, sensor, or portion of that circuit. For information unique to your car, use a respected automotive information source (such as All Data DIY). This code is only used in cars that are equipped with drive-by-wire (DBW) technology.
- It is the PCM that controls the DBW system, which is comprised of a throttle actuator motor, one or more pedal position sensors (also known as accelerator position sensors), and numerous throttle position sensors.
- The circuit is completed by the use of a potentiometer of type TPS/PPS.
- Because of the movement of the contacts across a circuit board, the resistance of the sensor varies, creating variations in circuit resistance and, as a result, fluctuations in the signal input voltage to the PCM.
- In response to the foot petal being pushed, the PCM gets an input signal instructing it to open the throttle plate, as well as an output signal indicating how far the throttle plate should be opened.
- The PCM continuously monitors the signal from the PPS as well as the signal from the TPS and compares the results obtained by the two sensors.
In the vast majority of situations, the PCM will also enter limp mode. If the engine acceleration is not disabled while in this mode, the engine’s performance will be severely restricted.
What are the common causes of code P2138?
- TPS or PPS that is not working properly
- Electrical connections that have corroded
- Circuits that are open or shorted between the TPS, PPS, and the PCM
- A faulty DBW actuator motor has been identified.
What are the symptoms of code P2138?
- Limited or non-existent acceleration
- A stuck throttle (at any RPM)
- Engine stalling when allowed to idle
- Hesitation while accelerating
- And cruise control not functioning.
How do you troubleshoot code P2138?
P2138 is often diagnosed with the use of a scanner, digital volt/ohmmeter (DVOM), and a vehicle information source such as All Data (DIY) in the traditional manner. The visual evaluation of all system-related wiring and connectors is the initial step in the majority of effective diagnosis procedures. Aside from that, I’d look for any evidence of carbon buildup or damage on the throttle plate. Inspect and repair or replace any damaged wiring or components as needed, and then retest the DBW system.
- You may also wish to save any freeze frame data that is associated with the incident.
- Clear the codes from the computer and do a test drive in the car.
- If this is not the case, the illness may have to deteriorate more before a diagnosis can be determined.
- Technical service bulletins (TSB) that are applicable to the condition and vehicle in issue should be obtained from your vehicle information source.
- Make use of the information given in the applicable TSB to assist you in making a good diagnosis.
- Reduce the size of the data stream so that only relevant information is displayed for faster data response.
- As long as the test leads are connected to the right circuits, the DVOM can produce live data.
- As the throttle is gently activated from the closed position to the wide open position, you are searching for voltage glitches (again).
- It is reasonable to believe that the sensor under examination is faulty if glitches or other abnormalities are discovered.
Codes Related to P2138
- PN0120Throttle Position Sensor/Switch A Circuit Malfunction
- PN0121Throttle Position Sensor/Switch A Circuit Range/Performance Problem
- PN0122Throttle Position Sensor/Switch A Circuit Low Input
- PN0123Throttle Position Sensor/Switch A Circuit High Input
- PN0124Throttle Position Sensor/Switch A Circuit Intermittent
- PN0220Throttle Position Sensor/Switch B Circuit Mal
BAT Team Discussions for P2138
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P2138 Throttle/Pedal Position Sensor/Switch ‘D’/’E’ Voltage Correlation
- P2138 Technical Definition: Voltage Correlation between the throttle/pedal position sensor/switch ‘D’ and ‘E’
- P2138 indicates that the accelerator pedal position is not functioning as planned. The most prevalent reason is: Failure of the accelerator pedal position sensor or damage to the wiring/connector
- Engine/driver risks are quite high. Don’t go behind the wheel of the automobile since it might be risky
- The severity of the emissions is LOW. There should be no concerns with the car’s emissions
- Repair time is estimated to take 1-2 days
- Repair costs are estimated to be in the vicinity of $200.
A technical definition for P2138 is: ‘D’/’E’ Voltage Correlation of the throttle/pedal position sensor/switch d/e; This message indicates that the accelerator pedal position is not functioning as planned. Causes that are most frequently seen are listed below. Failure of the accelerator pedal position sensor or damage to the wiring/connector High-risk situations for the engine and driver It is not advisable to use the vehicle since it might be hazardous; SEVERITY OF EMISSIONS: SMALL No difficulties with emissions should be encountered by the vehicle.
Repair costs are expected to be in the vicinity of $200.
6 Common Symptoms When Code P2138 is Present
The following are the most prevalent symptoms of data problem code P2138:
- The Check Engine Light (CEL) is illuminated, and the throttle is stuck open or closed. Lack of control over engine acceleration
- Erratic acceleration control (lags)
- Inability to control engine acceleration There will be no acceleration. Increased or decreased idle speed compared to typical
Possible Causes For Error Code P2138
The following are the most prevalent reasons of data problem code P2138:
- Broken or burned APP sensor wire
- Damaged or loose APP sensor connector
- Disconnected or bent pins on the sensor’s connector
- Faulty APP sensor
How To Diagnose The Engine Code P2138
For the purposes of this essay, it is assumed that you are familiar with the fundamental safety measures that should be followed when working on your car. When feasible, always refer to the original equipment manufacturer’s (OEM) literature. Diagnostic techniques developed by the original equipment manufacturer should always take precedence over a generic process. After that, let’s get started on the diagnostic procedure! 1. First and foremost, preliminary measures must be taken. It is necessary to clear the ECU memory and perform a driving cycle in order to rule out the possibility of an intermittent DTC issue.
- Take note of any data problem codes that you encounter. Delete all problem codes from the memory
- Make at least five to ten minutes of driving in a cycle.
If the Check Engine Light does not illuminate, it is possible that you have an intermittent problem. If the light comes on while you’re driving, continue with the diagnostic procedure until the light goes off. In order to visually verify the condition of the APP sensor, you will need to remove it from the car for inspection. Typically, the Accelerator Pedal Position Sensor and the accelerator pedal are the same piece of equipment. Check for any unexpected conditions such as a damaged sensor, a frayed cable, or other issues.
- Check for burned, broken, corroded, or degraded wires, as well as disconnect the sensor and inspect it for bent terminal pins, loose connections, corrosion, or any other possible indicator of a faulty connection, before proceeding.
- The sensor signal and the reference voltage of the APP sensor are checked.
- If a circuit line has to be repaired, do so.
- Scan Tool Evaluations APP1 and APP2 signal readings should be shown on the screen based on your car and automotive scanner, and you should be able to read the numbers from the accelerometer pedal position sensor.
- Turn the key on, engine off (KOEO), and press the accelerator pedal all the way to the wide open throttle position, then release the pedal.
- Keep an eye on the APP1 and APP2 values.
- Both readings should be comparable, but with a little difference in the offset between the two of them.
How To Repair Error Code P2138
Depending on the findings of the diagnostic tests, you may be required to undertake the following:
- Sensor for the Accelerator Pedal Position should be replaced. Repair the wiring or connection that controls the accelerator pedal position.