P0743 OBD-II Trouble Code: Torque Converter Clutch Circuit Electrical

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

SCHEDULE P0743 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0743 code

P0743 is a diagnostic trouble code (DTC) for "Torque Converter Clutch Circuit Electrical". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0743 DIAGNOSTIC Get a fair and transparent estimate upfront

Code definition

The P0742 trouble code means that the powertrain control module has found in abnormality with the torque converter clutch circuit.

What the P0742 code means

When the powertrain control module has detected that there is a variation from the manufacturer’s specifications with the torque converter clutch application, this code will be stored. Keep in mind that some applications will require multiple failure cycles before the Check Engine light comes on.

What causes the P0742 code?

The following are some of the most common causes for the P0742 code:

  • Faulty torque converter clutch solenoid
  • Defective torque converter
  • Mechanical internal transmission failure
  • Hydraulic blockages inside internal transmission fluid passages
  • Low transmission fluid
  • Dirty transmission fluid
  • A faulty transmission control module or faulty PCM

What are the symptoms of the P0742 code?

These symptoms detected with AP 0742 code can vary substantially. In some cases, the driver might not notice any problems at all what they are behind the wheel. In other cases, they will notice that the engine has issues and it may stall when they have come to stop and the engine is still idling. This can happen at a stop sign or stop light, for example. Some of the other symptoms include trouble shifting, a slipping transmission, lower fuel efficiency, and an overheating transmission. In addition, the Check Engine light will often come on when this code is stored.

How does a mechanic diagnose the P0742 code?

When the mechanic is diagnosing P0742 code, he or she will begin by connecting their OBD-II scanner to the vehicle’s onboard computer. The onboard computer will have stored the trouble code and data from the vehicle. The scanner checks that data. The mechanic then wants to reset the trouble code and drive the vehicle. They do this so they can see if the code comes back. If it does, that means it was not set by mistake. Then, they can continue with the diagnosis to determine what is causing the P0742 code.

Common mistakes when diagnosing the P0742 code

a number of technicians have found that mechanics have replaced the lock up solenoids and torque converters when they do not need to be replaced. In those cases, the mechanics have overlooked the simpler problem of wire malfunctions affecting the torque converter.

How serious is the P0742 code?

If the vehicle is suffering from the symptoms of the P0742 code, then it can be very problematic to drive. The driver might have issues when it comes to shifting the vehicle, and they may notice that their transmission is overheating, which could cause other problems. It can also be a problem to have a vehicle stall when it comes to rest at a stop sign or stoplight. In some cases, it could even be dangerous. Even in those cases when the driver doesn’t notice any issues, if the P0742 code has been stored, it’s a good idea to take the vehicle to a mechanic.

What repairs can fix the P0742 code?

The following are some of the repairs that a technician might make to fix the P0742 code:

  • First, they check to make sure the trouble code is legitimate by resetting, it driving the vehicle, and seeing if it comes back
  • Mechanic will then check the wiring and connections to make sure everything is connected properly and there are no issues
  • The mechanic will also check to make sure there is plenty of transmission fluid, and that it is not dirty or contaminated
  • The mechanic will check for blockages in the transmission fluid passages
  • The mechanic may need to replace the torque converter clutch solenoid or the torque converter
  • In rare cases, they may need to replace a transmission control module or PCM

Additional comments for consideration regarding the P0742 code

Regardless of whether the driver notices any issues well driving the vehicle, if the P0742 code has been stored, the best course of action is to take it into a mechanic.

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 1-800-701-6220.

trouble codes
Check Engine Light
P0743

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

SCHEDULE P0743 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

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

Related questions

Throttle position sensor light on

For many vehicles, regardless of manufacturer, there is the need to do a "re-learn" sequence (after replacing the TPS or a battery) so the TPS and transmission will work smoothly. You may have to drive the vehicle for a bit...

Check Engine Diagnosis - Transmission controller Communication error codes

Hello there, many different faults can cause this combination of codes on your 2006 Chrysler PT Cruiser. When we see loss of communication codes with Transmission Control Module (TCM) internal faults, this usually means one of the following: ...

Car got hot and lost all spark,it turns over but thats it.

There may be a couple of possibilities at play here. The overheating issue may be related to a faulty thermostat, coolant temp sensor relay or potentially a blown head gasket. This can cause the car to run rough or not...

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