The most common cause for P0128 in a GM is the engine coolant thermostat is stuck open. When the thermostat does open, hot coolant should start to flow and quickly warm up the radiator hose. If the radiator hose heats up slowly, the thermostat is stuck open or opening prematurely and needs to be replaced.
What does the p0128 code mean?
- The description for code P0128 is ‘coolant thermostat (coolant temperature below thermostat regulating temperature).’ This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. In other words the engine is running too cold – or at least the PCM thinks it is.
What does it mean when your coolant temperature is below thermostat regulating temperature?
It means that the ECM/PCM has “noticed” that the engine coolant temperature is consistently running below thermostat regulating temperature. In other words, the engine is running cooler than it should. To put it another way, the engine is running too cool or the temperature does not increase quickly enough.
What causes a coolant temp sensor to fail?
One of the common problems is; when the sensor has a, poor connection inside or in the connector. This causes interruptions in the signal to the (PCM) and the (PCM) sets the fault. In some vehicles, symptoms of this problem show up as, erratic readings of the temperature gauge.
Can I drive my car with a P0128 code?
Can I drive my vehicle with a P0128 trouble code and illuminated CEL? You may drive your vehicle with a P0128 trouble code. You will not notice any issue except for maybe the temperature gauge never reaching normal levels, and possibly the Check Engine light being illuminated.
Can low coolant cause P0128?
Low engine coolant can alter the engine running temperature enough to signal trouble code P0128. Your intake air temperature sensor, coolant temperature sensor and coolant fan could also signal this trouble code, so these should be inspected after you look over your thermostat and coolant level.
Where is the temperature sensor located?
Most of the time it is close to the thermostat of the cooling system, or in some cases even inside of it. Note: Some engines may actually have a pair of sensors—one sending information from the engine to the control unit, the other sending information from the control unit to the dash.
Will a bad thermostat throw a code?
the most noticeable issues occur when the thermostat gets stuck in either the open or closed position. a malfunction can result in a trouble code, generated by the engine’s computer, which can turn on your check engine light.
What does P2181 code mean?
Diagnostic trouble code (DTC) P2181 stands for “ Cooling System Performance.” It is triggered when the powertrain control module (PCM) detects that the coolant temperature in the radiator and engine is outside of the normal range (too hot or too cold).
What causes low engine temperature?
The most common reasons for the temperature to remain low include: A thermostat stuck open. A bad engine coolant temperature sensor. A locked fan clutch.
What sensor controls the temperature gauge?
To troubleshoot your car’s temperature gauge, you need to know how it works. The temperature gauge reading starts out as a reference voltage that is sent to the coolant temperature sensor. This sensor is nothing more than a thermistor — a variable resistor that changes resistance with temperature changes.
What are signs of a bad thermostat?
5 Symptoms of a Bad Thermostat (and Replacement Cost)
- #1 – Temperature Gauge Reading Higher (or Lower) Than Normal.
- #2 – Sudden Air Temperature Changes Inside Vehicle.
- #3 – Coolant Leaking.
- #4 – Rumbling Noises.
- #5 – Heater Malfunction.
How serious is a P0128 code?
Error code P0128 is not serious enough to require immediate repair or prevent you from driving your vehicle. However, as it can greatly impact fuel economy and emissions, the issue should be addressed in a timely manner. Prolonged coolant temperature problems can also lead to serious engine damage.
How much does it cost to replace a coolant thermostat?
You will pay between $150 and $200 to have your thermostat replaced. The labor should be around $125, while parts should cost you, on average, about $45.
GM P0128 – Meaning, Causes, Symptoms, & Fixes
The temperature of the coolant thermostat is below the regulating temperature.
GMCode P0128 Meaning
The powertrain control module (PCM) of your vehicle keeps track of how long it takes for the engine of your vehicle to achieve and maintain the proper operating temperature. As soon as the proper engine operating temperature is attained, the powertrain control module instructs the fuel system to enter ‘closed loop,’ in which the readings from the oxygen sensors are utilized to maintain the efficient air to fuel mixture, which is 14.7:1 by default. The majority of PCMs require that the engine coolant temperature sensor record temperatures greater than 160 degrees Fahrenheit within 15 minutes of the engine being started.
If one of these two requirements is not satisfied, the PCM of your GM will record the failure.
GM P0128 Symptoms
- Make sure the engine is working properly. The light is on
- The idle speed is higher than usual
- Fuel efficiency has been reduced. The temperature gauge has dropped to an exceptionally low level.
GM P0128 Causes
(The asterisk denotes the most common)
- Faulty coolant temperature sensor
- Faulty wiring for the coolant temperature circuit
- Radiator fan that is continually operating
- Stuck open thermostat*
GM Code P0128 Severity – Low
A thermostat that has become stuck open is most likely the source of the problem; nevertheless, thermostats are often constructed such that when they fail, they remain open, enabling full flow of coolant to safeguard your engine. Make sure your coolant level is fully charged before proceeding with the operation of the vehicle. In the event that your engine overheats, it will result in engine failure.
GM Code P0128 Common Diagnosis Mistakes
Many people just replace the thermostat in their General Motors vehicle without investigating all of the probable issues. Examine the cooling system for rust deposits or a blend of different coolants to determine its condition. When changing the thermostat, make sure to clean the engine block and radiator thoroughly to avoid deposits from becoming lodged in the new thermostat housing.
GM Code P0128 Diagnosis Steps
- Verify that P0128 is the only code present on your GM by scanning it. If there are any additional codes present, they must be dealt with first. Check the level and condition of the coolant. If there is an excessive amount of rust and poor coolant quality, this can cause the cooling system to clog up and the thermostat to become unresponsive. Remove any corrosion from the cooling system by flushing it with fresh water and replacing the coolant. It is necessary to refill the coolant system if the level is low and to check for leaks. An electronic multimeter may be used to examine the coolant temperature sensor. The ohm measurement will fluctuate in response to changes in temperature. if the ohm reading in your GM does not change with the temperature, replace the coolant temperature sensor in your vehicle, or fix any damaged wiring that may have been caused by the sensor
- The most common cause of P0128 in a General Motors vehicle is a jammed open engine coolant thermostat. This may be easily diagnosed by feeling the radiator pipe and monitoring how hot the coolant becomes as it begins to flow through the radiator hose
- However, you must exercise extreme caution when doing so since you could be burnt. The hose should only be somewhat heated until the thermostat is activated. The heated coolant should begin to flow through the radiator line as soon as the thermostat is activated, immediately warming it. if the radiator hose warms up slowly, the thermostat may be jammed open or may be opening prematurely, and it is necessary to replace it.
- Replace the thermostat, as well as the gaskets and coolant. Test drive the vehicle and keep an eye on the coolant temperature. Look for any leaks.
What causes a P0128 code on GM
A P0128 code is described as Engine Coolant Temperature (ECT) below Thermostat Regulating Temperature, and many individuals automatically replace the thermostat when they receive a code like this. Although it is a low-cost component, it is unlikely to resolve the P0128 error and will instead cause the code to reappear. In order to resolve the issue on the cars mentioned below, General Motors has released service bulletin 09-06-02-004A. 2009 All vehicles equipped with the 3.6L engine AND built prior to the VIN breakpoints listed below: Buick Enclave 2009 Chevrolet Traverse 2009 GMC Acadia 2009 Saturn OUTLOOK All vehicles equipped with the 3.6L engine AND built prior to the VIN breakpoints listed below: Buick Enclave 2009 Chevrolet Traverse 2009 GMC Acadia 2009 Saturn OUTLOOK Buick 9J191884GMC Acadia 9J191884Saturn Outlook 9J191884Chevrolet Traverse 9S143279Buick 9J191884GMC Acadia 9J191884Saturn Outlook 9J191884Chevrolet Traverse 9S143279 Before proceeding, the service bulletin urges you to check the coolant level on your vehicle.
If the system is completely full, REPROGRAM the PCM using the most recent software available.
A vehicle’s programming may be updated at any dealer or independent shop that has the necessary equipment.
Please check with your dealer first to see if your vehicle is protected by the 8-year/130,000-kilometer emission controller warranty, which was implemented in 2016. Rick Muscoplat is a professional musician. Rick Muscoplat posted a blog entry on
How to Fix P0128 Code ❤️ “Coolant Thermostat Temperature Below’
If you’re looking for information on how to fix the P0128 problem, first make that the error code is there by utilizing an OBDII scanner. After you’ve determined the source of the problem, you’ll need to check two components: the ECT sensor and the thermostat itself. If any of these components becomes defective, you must replace them immediately. Alternative to this is to have a professional mechanic evaluate the car for more complex testing before driving it. Automobile repairs are EXTREMELY EXPENSIVE.
- While it may appear that high temperatures are detrimental to any engine, your engine nevertheless need a specific degree of heat to run correctly at its optimum.
- This page has been written specifically for you in order to help you understand what is causing the P0128.
- In addition, we will discuss the key causes, symptoms, repair choices, and a general estimate of repair costs to assist you in resolving a P0128 error code problem.
- The P0128 code is defined as ‘Coolant thermostat temperature below the regulating temperature’ according to the standard.
- The following part will provide you with some basic information about the cooling system as well as the optimal engine temperature in order to help you better comprehend this error number.
- Despite the fact that temperature is widely recognized as one of the most dangerous enemies of any combustion engine, the engine must nonetheless achieve a particular temperature in order to function effectively.
- The cooling system in your car is the major component responsible for maintaining engine temperature regulation.
- Occasionally, when the thermostat fails, the engine will be exposed to the coolant all of the time, preventing it from reaching the optimal operating temperature.
- You’ll notice a drop in your vehicle’s overall performance as well as a considerable reduction in its fuel economy when the P012 code is activated.
Your vehicle’s engine will not function correctly when the P012 code is activated. What are the most common causes of the P0128 error code? When your check engine light activates as a result of a problem associated with a P0128 code, the problem is most likely caused by one of the following factors:
- A thermostat that has become jammed open
- It might be a faulty coolant temperature sensor. Wiring in the cooling system circuit that is not working properly
- A thermostat that isn’t working
What is the best way to tell if it is the P0128 code? Symptoms associated with the P0128 error code Early detection of a problem associated with the P0128 code may be accomplished by keeping an eye out for the following signs and symptoms in your car.
- The check engine light has been illuminated. Fuel efficiency has been reduced. Significantly greater idle than average
- Thermometer with a very low temperature range
Keep in mind that all of the symptoms listed might be attributed to a variety of different reasons. As a result, it is not possible to state categorically that when the temperature gauge is consistently low, the problem is caused by a P0128 coat. Using an OBDII scanner, you may validate and obtain reliable findings by connecting it to the engine and scanning for any fault codes that may exist. What is the solution to the P0128 error code? Because the P0128 error code may be addressed at home without the assistance of a professional technician, you can save hundreds of dollars on labor expenses.
Use an OBDII scanner to confirm the error
It is important that we are all on the same page before listing the many DIYs that we have inspected. This may be done by first validating the mistake and then completing the entity otherwise. It is possible that many individuals may believe that the problem is tied to AP0128, but this is not the proper way to proceed. Consequently, connecting the OBDII scanner to your vehicle’s computer and scanning for problems will take you no more than a few minutes at most. The problem codes will be shown on the screen by your OBDII scanner when they have been scanned and defined by the scanner.
Be aware that certain inactive or old errors may appear on the screen as well; as a result, double-check that you are looking at the most recent or active error codes before attempting to correct them.
Inspect the ECT sensor
It is important that we are all on the same page before listing the many DIYs that we have studied. This may be accomplished by first verifying the mistake and then executing the entity otherwise. The fact that many individuals believe the problem is tied to AP0128 is incorrect; nonetheless, this is not the proper way to proceed. So connecting the OBDII scanner to your vehicle’s computer and scanning for problems will take no more than a couple of minutes on most occasions. The problem codes will be shown on the screen by your OBDII scanner when they have been scanned and defined by your scanner.
Be aware that certain inactive or old errors may appear on the screen as well; as a result, double-check that you’re looking at the current or active error codes before attempting to correct them.
Check the thermostat
Assuming that the ECT sensor is functioning properly, the next step is to examine the thermostat itself in further detail. Locate your thermostat by consulting your vehicle’s owner’s handbook, then gently remove it from the vehicle. Keep in mind that you should avoid touching the engine while it is really hot since the thermostat may get quite hot, and messing with the coolant can be highly dangerous. Consequently, once the engine has cooled down, you may proceed with any examination or thermostat replacement that is necessary.
As a result, you will need to replace the thermostat and ensure that it is functionally comparable to the previous one before attempting to install it.
In order for the thermostat to work, it must be linked to the engine on one side and to the hose on the other.
A helpful advice in this case is to snap a picture of the old thermostat and use it to guide you through the process of installing the new one. Alternatively, you may always have the vehicle’s owner’s handbook on hand for more extensive instructions.
Clear the error code
Once the problem has been resolved, you must make sure that the error code has been manually cleared. Any internal problem codes linked with the check engine light will not be erased on their own by the check engine light. You must scan the vehicle with an OBDII scanner and request that any inactive codes be cleared. Once you’ve cleared the codes, you’ll be able to check that the problem has been resolved. In addition, it is critical that you do a second scan to guarantee that the area code does not surface a second time.
- When you take your automobile to a repair shop, they may examine it more closely and determine if you completed the DIY correctly or incorrectly.
- Is it legal for me to drive my automobile with a P0128 code?
- It is important to note that the only time you should stop driving this car is if the coolant level is low.
- What is the approximate cost of resolving the P0128 error code?
- As an example, if the problematic component that caused a P0128 code was a bad coolant temperature sensor, repair charges ranged from $140.00 to $190.
- Keep in mind that the cost of labor is a significant component of any repair expenses associated with the P0128 error code.
- This is because dealerships charge a high hourly rate.
While repairing the vehicle, there is a very little probability of introducing new problems.
P0128 codes are generally inexpensive to solve, therefore repairing them now to avoid severe problems down the line is always a good investment.
Example: If you know that your automobile has serious transmission or engine problems, it is never worth spending a few of hundred dollars to correct a P0128 code on your dashboard.
Is it possible for a thermostat that has become jammed open to cause a P0128 code?
Did you know that when a thermostat malfunctions, it is programmed to force the door to open automatically?
As a result, a thermostat that is jammed open is a fairly common source of the P0128 error code.
However, your engine must achieve its optimal operating temperature in order to function effectively.
Despite the fact that the P0128 code is not as dangerous as some others, it is critical that you as a driver take care of it as soon as you see it in order to avoid dealing with major difficulties down the road in the future.
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What is Trouble Code P0128
Thermostat for the coolant (Coolant Temperature Below Thermostat Regulating Temperature)
Here is what a P0128 means, in simple terms
The P0128 trouble code indicates that your engine is operating at an excessively high temperature. This sounds fantastic, doesn’t it? In actuality, it isn’t. An engine that is unable to reach the necessary temperature in the requisite amount of time may result in an increase in dangerous emissions. So the Engine Control Module (ECM) is configured to recognize low engine coolant temperature (when compared to ambient air temperature and a pre-determined value), as well the pace at which the pre-determined engine coolant temperature must be achieved.
What caused my vehicle to set a P0128 trouble code?
The Engine Coolant Temperature (ECT) sensor is used by the engine control module to assess whether or not an OBD-II P0128 code should be generated. Any time a trouble code P0128 appears by itself, a shop technician is likely to believe that the sensor for the engine coolant temperature or the thermostat is malfunctioning.
- A coolant thermostat that is either jammed open or opens prematurely
- Engine coolant temperature (ECT) sensor and/or ECT wire (most commonly at the ECT connection/harness) that are not functioning properly
What symptoms will my vehicle experience when trouble code P0128?
- Your vehicle’s check engine light (CEL), Malfunction Indicator Lamp (MIL), or Service Engine Light (SEL) is illuminated when the engine is running. When the ECC detects an issue with the engine coolant temperature, a light will be lighted and freeze frame data will be saved, containing information on the engine sensor data at the moment of detection. In addition, the trouble code P0128 will be logged in the ECM ROM memory. The engine will take an excessive amount of time to warm up (particularly on cold days)
- Because it uses the engine’s coolant to heat the vehicle’s interior, the air conditioning heater may not be able to achieve the desired temperature because the coolant never reaches its maximum working temperature. Because the correct engine operating temperature is not attained quickly enough, the smell of HC (hydrocarbon) lingers for a longer period of time than is typical during engine beginning.
How can I fix a P0128 problem and where should I start?
We recommend that you start by checking to see if your engine’s thermostat is functioning properly. A properly functioning thermostat should only let the flow of coolant after the coolant has reached the right operating temperature (usually around 200f). Start your engine (from a cold start) and observe the temperature of the radiator hose that is connected to the thermostat housing to determine whether or not the thermostat is working properly. To begin with, the hose should be chilly to the touch, but it should quickly become quite hot (after around 3-5 minutes depending on ambient air temperature).
- If you do not notice a sudden increase in the hose’s exterior temperature and instead feel the hose gradually getting warmer, your vehicle may have a thermostat that is stuck open, which allows coolant to flow through the radiator immediately after the engine is started.
- Providing the thermostat is performing as it should, the next component to be checked is the engine coolant temperature sensing device.
- Check for reference voltage from the ECM to the ECT while the ignition is turned on and the engine is turned off.
- After that, start the engine and measure the voltage across the ECT signal line.
- However, because the values vary from car to vehicle, we will not go into specifics about what voltage you should be seeing here.
- The most crucial thing to pay attention to is whether or not there is a voltage fluctuation.
As a final precaution, make certain that you take the reading after the ECT connection and at the ECT sensor. In this way, you may establish whether the problem is caused by a faulty connection, which might save you money by not having to replace the ECT needlessly.
- The coolant hose attached to the thermostat housing should be checked periodically for a sudden increase in temperature. Examine the ECT signal and the reference voltage for any anomalies. Check the ECT connection for damage.
Can I drive my vehicle with a P0128 trouble code and illuminated CEL?
- You may be able to use your car while the P0128 problem code is displayed. Except for the possibility that the temperature gauge never reaches normal levels and that the Check Engine light is lighted, you will not notice any problems with your vehicle. In addition, if your vehicle is required to undergo smog testing, the presence of the P0128 trouble code and the presence of the check engine light will result in the vehicle failing the test. The check engine light or malfunction indicator lamp is illuminated while the P0128 trouble code is recorded in the ECC.
Code P0128 – Coolant Temperature Below Thermostat Regulating Temperature
Date last updated: July 31, 2021 The codeP0128 – Coolant Temperature Below Thermostat Regulating Temperatureindicates that the engine has not reached the anticipated temperature after being operated for an appropriate amount of time, or, in other words, that it is taking an excessive amount of time to warm up. In frigid conditions, this code frequently causes the Check Engine light to illuminate and then turn off.
There might be no symptoms at all, or there could be any of the following symptoms associated with the code P0128: Because of the cold weather, the engine takes a long time to warm up; the engine temperature lowers when driving on the highway, especially in the winter; the air conditioner and (or) temperature gauge quit working; and (or) the Check Engine light illuminates (GM).
Is it safe to drive with the code P0128?
If the car is in good running condition, the coolant level is enough, there is sufficient heat, and there are no other driving difficulties, it is conceivable that the thermostat is stuck intermittently. In general, this is not a major issue, however it may have an impact on the gas mileage in some cases. We would nevertheless recommend that you get the car inspected by a mechanic.
A stuck thermostat may be the cause of occasional sticking if the car runs properly, the coolant level is normal, there is enough heat and there are no other driving difficulties. Although it may have an impact on gas mileage, this is generally not a major issue. We nevertheless recommend that you get the car inspected by a professional.
How the code P0128 is diagnosed:
The Torque app is being used to check the engine temperature. First and first, a simple check beneath the hood must be carried out: is the coolant level satisfactory? Check to see that the engine coolant temperature sensor connector is free of corrosion and that it is correctly connected. Do you know whether there are any service bulletins? The following step is to check to determine if the engine temperature sensor is functioning properly. You should check the engine temperature when the engine is cold if you have a scan tool that can record live data.
- Drive the car for 10 minutes and then check the engine temperature again; it should be between 180 and 220 degrees Fahrenheit (82 and 105 degrees Celsius).
- An ohmmeter can be used to test the engine temperature sensor if you don’t have access to a scan tool.
- More information may be found at: Symptoms, issues, and testing for the engine coolant temperature sensor are all covered in this article.
- It is common practice to replace a thermostat anytime the code P0128 is present.
In certain cases, reprogramming the engine computer (PCM) with current software may be sufficient to resolve the issue. This may be done at your local dealer and costs between $80 and $120 if the vehicle is not still under warranty. See the list of frequent issues below.
Common problems causing the code P0128 in different cars:
The code P0128 is frequently associated with a faulty thermostat in numerous General Motors vehicles (including the Chevrolet Trailblazer, Chevrolet Silverado, Chevrolet HHR, and other models). When the code P0128 is activated in some General Motors vehicles, the temperature gauge stops operating and the radiator fans operate continuously. Unless there are other concerns, replacing the thermostat is usually sufficient to resolve the problem. For the code P0128 in 2006 Chevrolet Malibu, Impala, Pontiac G6, and a few other vehicles, a 2007 General Motors Technical Service Bulletin proposes reprogramming the PCM as a remedy.
- According to the Mazda service notice, the code P0128 may be caused by incorrect calibration of the PCM (engine computer) in some early Mazda 3 and Mazda 5 model year vehicles.
- Subaru service bulletin 09-56-13 is available.
- It was discovered that resetting the PCM (engine computer) is recommended when the code P0128 is detected in a handful of Chrysler technical service bulletins for many Jeep and Dodge models.
- In this case, a shim should be used in conjunction with a thermostat housing that has been modified.
How the thermostat works
The code P0128 is frequently caused by a faulty thermostat in various General Motors vehicles (including the Chevrolet Trailblazer, Chevrolet Silverado, Chevrolet HHR, and other models). Some General Motors vehicles experience problems when the code P0128 is activated, including a malfunctioning temperature gauge and persistent use of the radiator fan. Unless there are additional concerns, replacing the thermostat usually solves the problem. For the code P0128 on 2006 Chevrolet Malibu, Impala, Pontiac G6, and a few other cars, a GM Technical Service Bulletin from 2007 proposes reprogramming the PCM.
It is possible that faulty calibration of the PCM (engine computer) is the source of the code P0128 in some early Mazda 3 and Mazda 5 model year vehicles, according to a Mazda service notice.
Bulletin 09-56-13 issued by Subaru It is recommended that the thermostat and gasket be replaced if the code P0128 is present and all other probable reasons have been ruled out for a number of 2013-2014 models, including as the Legacy, Forester, and Impreza.
According to yet another Chrysler Technical Service Bulletin for the 2009-2010 Dodge Challenger and 2008-2010 Dodge Magnum/Charger and Chrysler 300, the thermostat may shift out of position, allowing coolant to run through and setting the code P0128.
An new thermostat housing should be used in conjunction with a shim to resolve the issue.
What does trouble code p0128 mean on a car? – Swirlzcupcakes.com
What Is the Meaning of Trouble Code P0128? This generic issue code can be triggered by a wide range of vehicle makes and models. When your powertrain control module detects an odd temperature measurement while your engine is running, a code is generated and displayed on your dashboard. When your thermostat does not read any temperature or reads the temperature incorrectly, you will often receive a notification from the system.
What does p0128 mean on a Dodge thermostat?
Because this code frequently signals a problem with the thermostat, regardless of whether you are driving a Dodge, a Ford, or a Jeep, the P0128 code is likely to show whenever your coolant thermostat or temperature sensor fails to function properly. Of course, as previously indicated, there are a variety of other possible explanations for the code.
Can a p0128 coolant thermostat cause a burn?
When the engine is heated, the cooling system is pressured and extremely hot, and if you do not exercise caution, you might suffer burns or other bodily injuries. As a result of previous experience, it appears that the thermostat replacement is the most likely remedy for a P0128. However, the following are some recommendations for troubleshooting and correcting a P0128 OBD-II code:
When does the PCM record code p0128?
If one of these two requirements is not satisfied, the PCM will make a note of it. In the event that one of these faults is detected again on the next engine starter, the code P0128 is activated. The P0128 Error Has Several Symptoms. Code P0128 Is Caused By What Exactly? What Is the Severity of Code P0128? – Affordability
When does a car have a trouble code?
This generic issue code can be triggered by a wide range of vehicle makes and models. When your powertrain control module detects an odd temperature measurement while your engine is running, a code is generated and displayed on your dashboard. When your thermostat does not read any temperature or reads the temperature incorrectly, you will often receive a notification from the system.
What does trouble code p0125 stand for?
According to your vehicle, the actual position of the thermostat, as well as the concerns associated with a malfunctioning thermostat, may be different. In addition, the trouble code P0125 is associated with this problem in the majority of automobiles. When it comes to managing coolant temperature and monitoring for more significant engine concerns, your thermostat is a critical component.
What does the p0128 code on a Mercedes mean?
The P0128 Mercedes code is an error code that is used to identify a Coolant Thermostat in a Mercedes automobile. In the event that you receive the P0128 code on your Mercedes Benz, there are a few of possible explanations for the code to appear.
What causes Mazda 3 to have code p0128?
According to the Mazda service notice, the code P0128 may be caused by incorrect calibration of the PCM (engine computer) in some early Mazda 3 and Mazda 5 model year vehicles. Reprogramming the PCM with new software and, in the case of Mazda 3s made before to 2004, replacing the thermostat with a new component are the only options for fixing the problem.
Why does my car have trouble code p0125?
In addition, the trouble code P0125 is associated with this problem in the majority of automobiles.
When it comes to managing coolant temperature and monitoring for more significant engine concerns, your thermostat is a critical component. A faulty thermostat, on the other hand, is unlikely to result in any performance concerns.
What causes code p0128 on a Chevy Trailblazer?
The following are some of the most common problems that cause the code P0128 in different cars: The code P0128 is frequently associated with a faulty thermostat in numerous General Motors vehicles (including the Chevrolet Trailblazer, Chevrolet Silverado, Chevrolet HHR, and other models). When the code P0128 is activated in some General Motors vehicles, the temperature gauge stops operating and the radiator fans operate continuously.
What to do if your coolant temperature is below p0128?
P0128 should be addressed as soon as feasible. In order to thoroughly identify the problem, you’ll need to look into all of the likely reasons. If you do not have the necessary DIY car repair knowledge or abilities, you should get your vehicle checked by a professional technician.
What could cause the code p0128?
A thermostat that has become jammed is the most typical cause of the P0128 error code. During the heating of the engine, the wax contained within the thermostat expands, pressing down on the spring-loaded valve. This causes the valve to open, preventing flow via the bypass port but allowing flow through the radiator.
What causes a p0128 code on GM?
P0128 is caused by the GMC Envoy. Due to the fact that the thermostat is responsible for 90 percent of all P0128 errors, repairing the code is typically a straightforward process. The following are the most often seen causes of P0128: Generally speaking, the most common reason of the P0128 error code is going to be a thermostat that has become stuck open for an extended period of time. When a thermostat is jammed open, coolant is allowed to run through the engine at all times, which is dangerous.
What is check engine code p0128?
Engine code P0128 should be checked. The Check Engine light is illuminated, and the P0128 code for the coolant thermostat is shown (coolant temperature below thermostat regulating temperature).
What is p0128 code on GMC?
P0128 is a rather common OBDII fault code that appears on the dashboard. It is activated when the coolant temperature in your GMC Envoy does not reach the correct operating temperature. It is a generic powertrain code, which implies that it will have the same meaning regardless of who made the car (1996 and after). What Is the Meaning of Trouble Code P0128? This generic issue code can be triggered by a wide range of vehicle makes and models. When your powertrain control module detects an odd temperature measurement while your engine is running, a code is generated and displayed on your dashboard.
If one of these two requirements is not satisfied, the PCM will make a note of it.
The P0128 Error Has Several Symptoms.
What Is the Severity of Code P0128?
In addition, the trouble code P0125 is associated with this problem in the majority of automobiles. When it comes to managing coolant temperature and monitoring for more significant engine concerns, your thermostat is a critical component.
Chevrolet HHR Questions – what would cause my temperature gauge not to work and engine light com.
On my 2009 HHR, I experienced the identical problem with the temperature not reading and the A/C not functioning. There is no needle gauge reading, and there is no – readout for the on-board computer for the engine temperature, either. However, even after replacing the temperature sensor, which is situated on the drivers side of the engine, towards the back (be sure to let the engine cool down and use a drip pan), the problem persisted. I’ve read that if any of the other sensors aren’t working properly, the on-board computer can be fooled into thinking everything is fine.
- The problem had not been resolved, and the check engine light was now illuminated.
- On the way there, the temperature started to rise, according to both the needlegauge and the onboard computer.
- The parts associate informed me that I needed to detach the battery in order to reset it.
- In any case, I’m relieved to know that it’s got a new sensor and that my tires are correctly filled.
How Long Can You Drive with A P0128 Code?
Before delving into the intricacies of the P0128 Code, it’s important to understand what it represents and how it operates in your vehicle. Please don’t be concerned, since we are here to explain how long you may safely drive with a P0128 code. The code P0128 informs your repair sensor that the coolant thermostat in your automobile is functioning below the temperature that it should be. Alternatively, your car’s engine may not be heating up quickly enough. I understand what you’re thinking. Yes, a hot engine appears to be a terrible thing.
It operates in a closed loop to heat up quickly, and after it has reached a sufficient temperature, it opens up to allow the radiator to perform efficiently.
However, if you want more in-depth information, you may find it here.
Causes: Why P0128 Error Code Happens.
Before I go into detail regarding the reasons of the P0128, I’d like to call your attention to the following points: If the thermostat is left off for a lengthy period of time, it is possible that the temperature readings will be inaccurate. As a result, the PCM may be prompted to activate the P0128 as a result of this incorrect data. If the thermostat is not there, it may potentially result in the activation of P0128 being enabled.
As long as the coolant is not there, the temperature will not decrease.
When the coolant temperature sensor reports an inaccurate temperature measurement, the PCM may be triggered to generate the P0128 code, which is shown on the dashboard. If your automobile does not have a radiator fan, the temperature can quickly rise to dangerous levels at times. Because there is no way to cool down your engine, it might become quite hot. As a result, the code may be activated. If the wiring for the coolant temperature circuit is not properly installed, it may result in an increase in engine temperature.
- The P0128 Error Code has the following signs and symptoms: While you are looking for tips and techniques on how to fix and maintain your automobile, you should be aware of the signs and symptoms of the P0128 Code.
- As a result, take a moment to review the following points before proceeding with the repair.
- You will notice that the predicted start-up time for your engine is increasing longer.
- You’ll see that the anticipated start-up time for your engine is getting longer and longer as time passes.
- Check to see how low the temperature gauge has dropped.
- While the engine will require significantly longer time to warm up, the fuel efficiency will suffer as a result of the increased time required.
- Therefore, you will need to refuel more frequently than you would in a typical setting.
- Take it as a gentle warning that the vehicle’s engine is not up to the task of driving.
How can you fix the P0128 problem?
Experts advise that the first step in diagnosing the P0128 error code should be to examine the engine’s temperature sensor. Check to see if it reaches the proper operating temperature or not. As a rule of thumb, the temperature should range between 160° and 200° Fahrenheit. The question of how to check the thermostat’s functionality may arise from the opposite end of the spectrum. Begin by starting your engine and measuring the temperature of the radiator hose to determine how hot your engine is.
- However, it is possible that it will suddenly get quite hot in a matter of minutes (3-5 minutes).
- A jammed open thermostat situation may be present in your vehicle in this instance.
- While the thermostat continues to function properly, as it did previously, you should examine the engine coolant temperature (ECT) sensor at this point.
- Keep the ignition turned on and the engine turned off.
- Keep an eye on at least 5 volts on a constant basis.
- When the temperature of your engine rises, the voltage will fall.
Pay attention to the voltage reading to determine if there is a voltage fluctuation or not. Check the readings after the engine coolant temperature connection as well at the engine coolant temperature sensor itself to ensure that they are accurate. Follow the steps outlined below, one at a time:
- If you notice an unusual increase in temperature, check the coolant sock linked to the thermostat housing. Check the ECT signal and the reference voltage at the same time. Perform a visual check of the ECT connection.
How to Diagnose and Repair the P0128 code?
The first step in diagnosing your vehicle is to run a scan on it, which will reveal whether or not the P0128 code exists. After that, look to see if there are any error codes present. If there are any problems, you should take care of them first. After that, check the coolant levels to see how they’re doing and what the scenario is. There is no good condition in the coolant that comes together with big rusts. Efforts must be made to flush out the rust as quickly as feasible. Moreover, if the coolant level falls below a certain level, you should check for leaks and thoroughly inspect the coolant system this time.
- If the coolant temperature sensors are not functioning properly, they must be replaced immediately.
- If your radiator fan is incapable of adequately cooling your engine, you must replace it as soon as possible.
- The vast majority of those who diagnosis this procedure do so without being aware of all of the probable causes.
- It is necessary to thoroughly clean the engine block and radiator fan in order to avoid rust deposits from being pushed into the newly installed thermostat.
- It is possible that you will encounter difficulties if your thermostat is stuck open.
- Perform an examination to ensure that the coolant system is functioning properly.
How Long Can You Drive with A P0128 Code?
The first step in diagnosing your vehicle is to run a scan on it to see whether the P0128 code is there. In the following step, determine whether any error codes exist. The first step is to identify and resolve any concerns. Examine the coolant levels to determine how they are doing and whether they need to be replaced. There is no good condition in the coolant that arrives with large rusts. You must flush out the rust as quickly as possible once it has accumulated. Moreover, if the coolant level falls below a certain level, you should check for leaks and thoroughly inspect the cooling system.
- Coolant temperature sensors must be replaced if they are not functioning properly.
- It is critical to repair your radiator fan as soon as possible if it is incapable of adequately cooling your engine.
- It is likely that the majority of those who diagnosis this surgery do so without considering every potential reason for it.
- It is necessary to cleanse the engine block and radiator fan in order to avoid rust deposits from being pressed into the new thermostat.
It’s possible that you’ll have difficulties if your thermostat is stuck open. When thermostats become jammed open, they fail. Confirm that the cooling system is working properly. A hot engine will eventually fail, therefore avoid overheating the engine.
Cost of fixing a p0128
In order to resolve the issue, you will need to address the fundamental concerns that have been raised thus far in this article. As a result, you must estimate the cost of all possible repairs. The approximate cost in this case is composed mostly of two sorts of costs. In addition to the expense of:
- Thermostat: There are a variety of items available, and it is not feasible to provide an exact cost. In general, you’ll need anything in the neighborhood of $150. Check out the Amazon product I’ve recommended to you. Sensor for measuring the temperature of the coolant You will need an additional $25-$50 to purchase it in this location.
Let’s wrap up the P0128 code issue once and for all! You’re on the verge of crossing the finish line. We’ve attempted to provide you with as much information as possible on the error code P0128, as well as an answer to the huge question of how long you may drive with a P0128 code. If you are having any difficulties with the P0128 code, then you should follow the above-mentioned procedure. Hopefully, you’ll be able to fix it without too much difficulty.
When an engine has been idle for eight or more hours, the ECM expects to observe IAT and ECT resistance readings that are within ten degrees of each other, according to the documentation. When the engine is started, it performs a temperature check to ensure that the coolant temperature is rising as predicted depending on the amount of run/drive time spent. If the ECM detects a resistance dispersion between the IAT and the ECT (that is outside of the intended values), it will set the P0128 error code.
If the engine temperature is maintained at a low level for a lengthy period of time, the resistance signal returning to the ECM is interpreted as a super cold temperature.
The disconnecting of the ECT connector at a time when the gauge is reading near the typical running temperature position, in my opinion, would be an effective short test.
After that, jump the two pins and it should peg to full power.