Fix code P0742 Check engine light on – GM the wire to chafe and short to ground. That can cause all the trouble codes as well as harsh shifting due to high line pressure. If you find a chafe on this wire, do not attempt to splice it. Replace it with an updated harness.
- Engine Light ON (or Service Engine Soon Warning Light) | P0742 GMC code description The Torque Converter Clutch (TCC) solenoid valve is activated, with the gear in D4, by the Transmission Control Module ( TCM ) in response to signals sent from the vehicle speed and the Engine Control Module (ECM).
How do I fix error code P0742?
What Repairs Will Fix P0742?
- Replace the torque converter clutch solenoid.
- Replace the torque converter or clutch.
- Change transmission fluid and filter.
- Repair/replace damaged wiring and connectors.
- Repair/replace TCM or ECU.
- Install a rebuilt or remanufactured transmission.
What does Engine code P0742 mean?
When the P0742 code appears, it means that the amount of torque converter lock up required is not in line with the amount that is actually detected. The transmission control module will detect the slippage on the torque converter clutch when the converter is commanded off.
What causes torque converter to Stuck?
A problem with the TCC circuit, such as damaged wiring or loose connections (when equipped) A faulty sensor inhibiting TCC lockup (on electrically controlled TCC systems) Low or dirty transmission fluid. Issues with the control module, such as software in need of an update.
How does a torque converter clutch solenoid work?
The solenoid moves a valve that sends pressurized fluid to the clutch circuit, engaging the TCC. When the clutch is disengaged, the torque converter allows the engine to rotate without stalling. While the vehicle is slowing and approaching a stop, the TCC’s application is undesirable.
How do I know if my torque converter clutch solenoid is bad?
When the torque converter starts malfunctioning, you may feel shuddering and even slipping in overdrive. You usually notice your car shuddering because it feels like it’s vibrating. Your car will vibrate even when you’re not going very fast. The shuddering makes the car lag and is very noticeable.
How do I fix code P0842?
What repairs can fix the P0842 code?
- Replacing the pressure control solenoid.
- Refilling, or flushing and replacing, the old transmission fluid.
- Clearing blocked transmission fluid passages.
- Addressing any mechanic internal transmission failures.
- Replacing a faulty PCM or TCM, in rare cases.
Will a bad torque converter throw a code?
Will a bad torque converter throw a code? Sometimes, but not always. Most torque converter-related codes have to do with the torque converter clutch. Other issues with the converter are less likely to set a code.
What are signs of a bad torque converter?
Symptoms of Torque Converter Problems
- Slipping. A torque converter can slip out of gear or delay a shift its fin or bearing is damaged.
- Contaminated Transmission Fluid.
- Increased Stall Speed.
- Unusual Sounds.
How do you know if you have a torque converter problem?
There are several signs that you might have a torque converter issue:
- Loss of Acceleration.
- Slipping Between Gears.
- Vehicle Won’t Shift at All.
- Transmission is Overheating.
- Transmission Fluid Leak.
- Bad Transmission Fluid.
How do you check a torque converter clutch?
Testing for Bad Torque Converters Turn the ignition key and start up the engine. Wait for a few minutes for the engine to warm up, then gently press the accelerator twice and rev up the engine. Once it returns to its idle state, press the brake pedal all the way and shift into drive.
How much does it cost to replace a torque converter clutch solenoid?
If the solenoid needs to be replaced, then it may cost you between $85 and $400. The individual solenoids only cost $15-$30, on average, but can be as much as $100.
What happens when the torque converter clutch is locked?
Torque converter lock-up is engaged through a solenoid mounted inside the transmission. This clutch acts just like a clutch disc in a manual transmission application. When the converter is “locked up” this clutch is forced against the front of the converter creating a direct drive from engine to transmission.
P0742 Torque Converter Clutch Circuit Stuck On DTC
Dan Weller contributed to this article. Master Technician with the American Society of Automotive Engineers Torque Converter is an abbreviation for Torque Converter. Clutch Circuit Is Stuck In Place This diagnostic trouble code (DTC) is a general OBD-II powertrain code that may be seen on many vehicles. In this case, the term “generic” refers to the fact that it applies to all makes and models of automobiles (1996 and newer), albeit precise repair processes may differ depending on the model.
What does that mean?
To enhance the engine torque output and drive the back wheels, modern cars equipped with automatic transmissions / transaxles make use of a torque converter that is located between the engine and gearbox. The engine and transmission are actually connected by a fluid coupling mechanism located inside the torque converter, which is responsible for multiplying the torque until the speeds equalize and a “stall” speed is reached at which the difference between actual engine RPM and transmission input RPM is approximately 90 percent efficient.
There has been a failure identified in the circuit that runs the torque converter clutch solenoid, according to the transmission control module.
Note: There may be other diagnostic issue codes linked with the transmission control module that may only be obtained with the use of a sophisticated scanning instrument.
Among the possible symptoms of a P0742 error code are:
- The Stuck On Indicator Lamp (MIL) (also known as the Check Engine Light) is lighted. If the torque converter clutch is genuinely jammed on, the engine may stall when the engine is running at low speeds. When travelling at highway speeds and then coming to a complete stop, this is a regular problem for specific model GM automobiles. The engine dies as a result of the torque converter clutch becoming locked in the on position. In most cases, the engine will restart and restore regular functioning immediately.
The following are possible causes of this DTC:
- Damaged, pinched, or shorted-to-power wiring harness connecting to transmission
- A problem with the torque converter clutch (TCC) solenoid
- A problem with the transmission control module (TCM).
Diagnostic Steps for P0742 DTC
Inspection of the transmission wire harness for damage or loose connections should be performed. The right power supply, as well as all connecting points between circuits, should be identified using a factory wiring schematic. Power for the transmission may come from a fuse or a relay, and the transmission may be initiated by a TCM. Test the wiring for the control circuit between the TCM and the wiring harness connector at the transmission case using a DVOM set to the volts scale – it may be necessary to remove the pin from each side of the harness connector to isolate it from the harness while it is still plugged into the TCM and transmission case to ensure that the circuit is functioning properly.
- If voltage is present, it is likely that there is a short to power, and the source of the short circuit in the wire harness assembly must be identified.
- Torque converter clutch (TCC) solenoid Some brands and models employ a transmission wire harness that includes the TCC solenoid as well as the internal harness as a single piece of equipment.
- Resistance should be within the manufacturer’s requirements; if it is too low, it may be required to remove the transmission oil pan in order to check or replace the solenoid inside the transmission, but this is rare.
- Transmission control module (TCM) The torque converter clutch solenoid is generally regulated by a duty cycle in order to engage a more pleasant torque converter clutch engagement for the user.
- To test the positive lead, insert it into the wire harness that is hooked into the TCM, while to test the negative lead, insert it into a known good ground.
Depending on the circuit being utilized, if the cycle remains at 0 percent or 100 percent, it is necessary to re-check the connections. If the wiring and the solenoid are in proper working order, the TCM may be at fault.
Related DTC Discussions
- Inspection of the transmission wire harness for damage or loose connections should be carried out. The right power source, as well as all connecting points between circuits, may be identified using a factory wiring diagram. Power for the transmission may come from a fuse or a relay, and the transmission may be initiated by the transmission control module. Test the wiring for the control circuit between the TCM and the wiring harness connector at the transmission case using a DVOM set to the volts scale – it may be necessary to remove the pin from each side of the harness connector to isolate it from the harness while it is still plugged into the TCM and transmission case to ensure that the circuit is working properly. If you have the key on and the engine off, check for battery voltage with the positive leads on each end of the wire and the negative lead connected to a known good ground. Consider whether there is a short to power present and whether you can locate the short circuit’s cause inside the wire harness assembly. After removing the transmission harness plug (if applicable, some makes/models use a torque converter clutch (TCC) solenoid that is bolted directly to the transmission case), check the resistance in the TCC solenoid and internal transmission wiring at the transmission case. Torque converter clutch (TCC) solenoid- The transmission wire harness, which includes the TCC solenoid and the internal harness, is used by some makes and models as a single assembly. Setting the DVOM to the ohms scale and connecting the positive and negative leads to the TCC power and control circuit pins will get the best results. In order for the resistance to be within the manufacturer’s standards, it may be required to remove the transmission oil pan in order to examine or replace the solenoid within the transmission. Due to the fact that the torque converter clutch is only activated under certain driving conditions, it will be necessary to monitor the transmission control module (TCM) with an advanced scan tool in order to determine whether the TCM is commanding the TCC solenoid and what the actual feedback reading at the TCM is. Transmission control module (TCM) The torque converter clutch solenoid is generally regulated by a duty cycle in order to engage a more pleasant torque converter clutch engagement for the driver. A graphing multimeter tuned to duty cycle or a digital storage oscilloscope will also be necessary in order to determine whether or not the TCM is truly transmitting the signal. To test the positive lead, insert it into the wire harness that is hooked into the TCM, while to test the negative lead, connect it to a known good ground. If you are using a sophisticated scan tool, the duty cycle should match what was specified by the TCM during the reading. Depending on the circuit being utilized, if the cycle remains at 0 percent or 100 percent, it is necessary to re-check connections. If all wiring and the solenoid are in proper working order, it is possible that the TCM is faulty.
Need more help with a p0742 code?
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Error Code P0742: Torque Converter Clutch Circuit Stuck On
Torque Converter Clutch Circuit Stuck On is the definition of the error code P0742. Meaning that the torque converter clutch circuit is malfunctioning, which is commonly caused by filthy transmission fluid or clogged valves in the transmission. This is a general problem code, which means that it applies to any vehicle equipped with an OBD-II system, as well as automobiles manufactured from 1996 to the present. Of course, the specifications for the definition, diagnosis, and repairs differ from one manufacturer and/or model to another.
To boost the torque production from the engine and drive the back wheels, modern automobiles with automatic gearboxes (transaxles) include a torque converter, which is located between the transmission and the engine. In fact, a fluid coupling mechanism inside the torque converter is what multiplies the torque until the speed is equal and creates a’stall’ speed at which the difference between the actual engine RPM and the transmission input of the RPM is approximately 90 percent efficient, allowing the engine and transmission to work together seamlessly.
A defect in the circuit that drives the torque converter clutch solenoid is detected by the transmission control module, resulting in the appearance of Error Code P0742.
Other diagnostic issue codes related with the TCM that may be present can be accessed with the use of an advanced scan tool.
The Check Engine light is on when the error code P0742 is encountered, as is the case with other error codes. It is possible for various cases and settings to have distinct symptoms, as well as for the intensity of those symptoms to vary. Drivers of other types of cars may not be aware of any problems at all. It will, however, be difficult for the torque converter to disengage in other circumstances. Other typical symptoms associated with this error code include:
- The gearbox slipping
- The transmission overheating
- The difficulty in shifting
- The engine stalling or dying
Error Code P0742 can be produced by a variety of factors, including but not limited to:
- Transmission fluid that is low or filthy
- A faulty solenoid valve in the torque converter
- The transmission is experiencing an internal mechanical difficulty.
How to Check
Typically, technicians will connect an OBD-II scanner to the car’s onboard computer in order to gather information about the vehicle and make the appropriate diagnostic.
Then, after they get the information, they will proceed to resetting the code and driving the car to check whether the code returns again. If the code does come back, it indicates that the condition was not tripped in error and that the problem is real and must be addressed as soon as possible.
How to Fix
Typically, technicians will connect an OBD-II scanner to the car’s onboard computer in order to gather information about the vehicle and provide an accurate diagnostic. Once they get the information, they will proceed with resetting the code and driving the car to check whether the code returns. If the code is returned, it indicates that the condition was not tripped in error and that the problem is real and must be addressed.
- Technicians often connect an OBD-II scanner to the car’s onboard computer in order to gather information about the vehicle and provide an accurate diagnostic. Once they get the information, they will proceed to resetting the code and driving the car to check whether the code returns. It is possible that the condition was not tripped in error, but that the problem is real and must be addressed.
Torque converter clutch wire problems and other faults are sometimes missed while a torque converter is in operation. Technicians will instead repair the lock up solenoids or torque converters in this situation, even though they are not required to do so. As a result, it is extremely vital to have an accurate diagnosis. Additionally, Error Code P0742 may signal a major problem, such as shifting difficulty, harsh running, or stalling when the vehicle is idle, among others. Things might be more than simply inconvenient; they can also be potentially hazardous.
GMC P0742 Torque Converter Clutch Circuit Stuck On – Car OBD Codes
P0742 (GM OBD2 Code) is defined as follows: The Torque Converter Clutch (TCC) solenoid valve is triggered by the Transmission Control Module (TCM) while the gear is in D4 in response to signals supplied by the vehicle speed and the Engine Control Module (ECM) to the transmission control module (ECM). The action of the lock-up piston will thereafter be regulated. Asynchronously with the activation of the torque converter clutch solenoid valve, the torque converter lockup clutch will engage, resulting in a 1 to 1 RPM ratio between the rotational speed of the transmission input shaft and the rotating speed of the torque converter lockup clutch.
During lock-up state, the engine speed should not change suddenly when the accelerator pedal is depressed only partially (less than 2/8).
Symptoms of OBD code P0742 GM – Engine Light ON include the following: (or Service Engine Soon Warning Light)
P0742 GM OBD code has several possible reasons. – Insufficient transmission fluid– Dirty transmission fluid – Torque converter that is faulty Torque converter clutch solenoid valve harness or connections – Torque converter clutch solenoid valve harness or connectors – The circuit for the torque converter clutch solenoid valve is open or shorted. – Internal mechanical problem with the transmission Error codes are normally activated when one or more of the following situations are detected: TCM has detected slippage on the TCC during a period when the converter has been instructed to be turned off.
The OBD2 Code Information Be Applicable For GMC:
The 2013 GMC Terrain Denali, 2013 GMC Acadia, 2011 GMC Sierra All Terrain HD Concept, 2010 GMC Terrain, 2010 GMC Granite Concept, 2009 GMC Sierra Hybrid Crew Cab, 2008 GMC Yukon Hybrid, 2008 GMC Denali XT Concept, 2007 GMC Yukon XL, 2007 GMC Yukon Denali, 2007 GMC Yukon, 2007 GMC Sierra Denali, 2007 GMC Sierra Classic, 2007 GMC Sierra 3500 HD SLT Crew Cab
1. The list of vehicle manufacturers on the right-hand side of the display screen. The GMC makes are represented by the ODB-ii codes that are currently in use. 2. Use the search box to look for any other OBD II Trouble Codes that may exist. In the search box, type in the five-character problem codes and hit the “Search” button. Remember that a particularOBD-II code does not always represent the same thing across different vehicle manufacturers, since there are numerous different manufactures specific codes in use.
This is because not allOBD2 codes used by one manufacturer are also used by other manufacturers.
The material included on this website is provided solely for the purpose of providing general information.
If you have any questions or concerns about the repairs on your car, please speak with your mechanic.
Oldsmobile Transmission Code P0742
1. The list of vehicle manufacturers on the right-hand side of the display screen. 2. It is for the GMC models that the current ODB-II codes have been chosen. 2. Use the search box to look for any other OBD II trouble codes that may exist. Then, in the search box, type five-character problem codes to see if they come up. Remember that a particularOBD-II code may not always imply the same thing across different auto manufacturers, since there are many different makes and models of vehicles. In the event that yourOBD-II issue codes are for a different vehicle, pick that vehicle series before looking for the diagnostic codes.
It is your responsibility to keep your car in good working order.
Oldsmobile TRAC And ABS Lights
2000OldsmobileSilhouette. 3.4-liter engine with anti-lock brakes and traction control as warning lights. The warning signal is illuminated, and the transmission changes smoothly, but the vehicle will not go into overdrive. A issue with the ABS system would result in the ABS and Trac lights being illuminated. It’s possible that an issue with the ABS is preventing the transmission from going into overdrive. I would recommend that you have the ABS corrected first. For example, a problem with the front wheel speed sensors or a wiring issue with one of the front sensors are both typical reasons.
06 HHR Electrical Problems – Code P0742
Since 2009, I have not participated in this forum. I have a 2006 Honda HHR with 149,000 miles on it. I haven’t had any serious issues with the vehicle up until now. Here’s everything you need to know: When the automobile was restarted after a rest break, the first sign that there was an issue was when the security indicator illuminated and remained illuminated, and the instrument panel powered down and back up. After shutting down the vehicle, cycling the key numerous times, and double-checking the connections to the battery terminals, the security indicator went off and the problem was no longer an issue.
- I went through the same process as before, and the problem subsided once more.
- The automobile began to shift more aggressively as well.
- The error code I received was P0742, which stood for TCC solenoid failure.
- I drove around 1100 miles after the problem began; I was a little apprehensive, but the car appeared to be in fine working order.
- That these codes all appear to point to the TCC solenoid malfunctioning isn’t the thing that worries me; it’s the fact that the security indicator is illuminated and that the instrument panel cycles on and off.
Despite the fact that this is mostly the speedometer and the temperature. I’m curious if anyone has any comments on this. Is there a circumstance when the TCC solenoid fails and results in this sort of behavior that anyone has seen or witnessed? Allen
check engine light
10-PCM P0751 H C was the code. That is the most recent code that appeared when I attempted to search it up. What if the numbers don’t appear on the screen? Any information would be much appreciated. It appears that the torque converter is not locking up in the vehicle. In addition, when driving at 65mph, the rpms were far too high for the 3.42 gears to be effective. It’s like 3000! Is there any information? Thanks Jimmy O: I’m Jimmy O. I’m Jimmy O. I’m Jimmy O. I’m Jimmy O. DTC P0751 is a slam dunk.
The 1-2 SS valve is a normally-open exhaust valve that is used in conjunction with the 2-3 SS valve to allow for four distinct shifting combinations to be achieved.
DTC P0751 is a type A diagnostic trouble code.
P0122 and P0123 DTCs for the TP sensor were not present.
DTC P0740 indicates that there is no TCC solenoid valve.
DTC P0753 indicates that there are no 1-2 SS valves.
DTC P0785 indicates that there is no 3-2 SS valve assembly.
DTC P1810 is a diagnostic trouble code.
For 5 seconds, the engine’s speed is more than 450 RPM, according to the manufacturer.
The TP angle is between 10 and 35 percent.
D4 is the gear ratio range.
The PCM directs a 1-2, 2-3, and 3-4 shift, respectively.
The car is traveling at a rate greater than 8 km/h (5 mph).
Engine speed in 3rd gear is 50 RPM lower than the previous engine speed in 2nd gear within 2 seconds of shifting into third gear.
In the event that all of the aforementioned requirements are satisfied, one of the following events occurs: Condition 1: The speed ratio is between 0.95 and 1.2.
The TCC slip speed is 200-1000 RPM for 4 seconds at a constant speed.
The speed ratio is 0.65 to 0.8 in condition 2.
When the DTC is activated, the following action is taken: The PCM causes the Malfunction Indicator Lamp to illuminate (MIL).
If the vehicle is traveling at a speed greater than 48 km/h, the PCM prevents 3-2 downshifts (30 mph).
When the Conditions for Setting the DTC are met, the PCM records the operating conditions in the event that the DTC is set. Freeze Frame and Failure Records are the two types of records that the PCM keeps track of this information. DTC P0751 is stored in the PCM’s history as DTC P07.