P0742 OBD-II Trouble Code: Torque Converter Clutch Circuit Stuck On

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0742 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0742 code

P0742 is a diagnostic trouble code (DTC) for "Torque Converter Clutch Circuit Stuck On". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0742 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

P0742 code definition

The P0742 code indicates that the torque converter clutch circuit is behaving in an abnormal manner.

What the P0742 code means

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. In some cases, this will require several fail cycles before the Check Engine Light illuminates.

What causes the P0742 code?

The P0742 code can be caused by a variety of things. The following are the most common:

  • Dirty transmission fluid
  • Low transmission fluid
  • Faulty torque converter clutch solenoid valve
  • Internal mechanical problem with the transmission
  • Torque converter clutch solenoid valve harness or connectors could be bad
  • Torque converter clutch solenoid valve circuit could be shorted or open

What are the symptoms of the P0742 code?

Symptoms associated with the P0742 code can vary substantially. With some vehicles, the driver might not detect any issues at all. However, in other cases it will no longer be possible for the torque converter clutch to disengage. Some of the other potential symptoms that you might notice with the vehicle include an overheating transmission, transmission slippage, and a more difficult experience when shifting. Many times, the code will be stored and the malfunction indicator light will turn on.

How does a mechanic diagnose the P0742 code?

Mechanics will want to hook up their OBD-II scanner to the vehicle’s onboard computer. The device makes it possible for them to retrieve data about the vehicle and can help with developing a proper diagnosis. Once they have gathered the data, they will reset the code and then test the vehicle. They want to see if the code returned. If it does, they know that it was not tripped in error and that the vehicle has a legitimate issue that needs to be resolved.

Common mistakes when diagnosing the P0742 code

In some cases, there are malfunctions in the torque converter clutch wiring, and these issues are overlooked. The technician instead replaces the lock up solenoids/torque converters when they don’t need replacement.

How serious is the P0742 code?

When a vehicle has the P0742 code stored, it has the potential to be a large problem. The driver might be fortunate and not notice any issues with their vehicle, but that’s not usually the case. The vehicle could have issues when you are shifting, or it can run rough and stall when you are idling. These things are more than just annoying. They have the potential to be dangerous. Whenever you have an issue with your vehicle, whether it’s a large or small problem, make sure you get the repairs you need.

What repairs can fix the P0742 code?

The following are some of the repairs that technicians can make when they are fixing the P0742 code.

  • Check the transmission wiring harness for loose connections and damage.
  • Check the resistance in the torque converter clutch solenoid and internal transmission wiring.
  • If the transmission control module has issues and is causing the codes to be set without reason, the mechanics may need to repair or replace it.

Additional comments for consideration regarding the P0742 code

The majority of the time when the P0742 code comes on the reason is because there is foreign material that is not allowing the proper function of the solenoid or because the fluid is not flowing properly through the transmission valve body. Although some vehicles will not experience any driving issues when this code is present, that is no reason to ignore it. Always have the vehicle diagnosed and serviced by a mechanic who has the knowledge and experience needed to fix this and any other issues your car might have.

Need help with a P0742 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0742

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0742 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...

Related questions

Q: Check engine sign on

Most Check Engine Lights are illuminated when an error code is triggered and stored in the ECM. Even if you've repaired what was broken or damaged, you still need to clear those codes in order for the light to go...

Q: Car drives poorly with heavy fuel consumption and poor transmission

Hi and thanks for contacting YourMechanic. First, with the dirty cooling system, you would need to perform a coolant flush and replace the thermostat and radiator cap. This will help with the overheating issue if you are still experiencing that....

Q: My Mercedes Benz A-Class -160A start and dies

Wow! That's quite a list! It can be confusing when you get a whole library of codes like that.There are several things that can make that happen. One is if the car was operated with a dead battery. Another is...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com