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P0740 is a diagnostic trouble code (DTC) for "Torque Converter Clutch Circuit Malfunction". 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.
Torque converter clutch circuit malfunction is the technical definition of this trouble code
What the P0740 code means is that the powertrain control module (PCM) has detected something unusual within the torque converter clutch circuit. The powertrain control module can vary the application of the torque converter clutch for optimal vehicle performance. If the torque converter clutch application is abnormal (usually multiple times) the powertrain control module will trigger a Check Engine Light.
Some potential causes of the P0740 code may include:
Symptoms of a P0740 code that the driver may experience would include:
A mechanic may begin the diagnosis of the P0740 code by first checking the transmission fluid for proper level and condition. If anything is out of the ordinary, this could be part of the problem. If nothing is wrong with the transmission fluid, the mechanic would then use service information to look up a diagnostic procedure for this code given by the manufacturer and then follow the instructions given. Keep in mind that this diagnostic may require the transmission to be removed or even disassembled.
An easy mistake that could be made is assuming that the torque converter is damaged just because this part is listed in the trouble code. This may result in a lot of money being spent to have it replaced, when it may just be the fluid level needing to be topped off. It is important to look at every aspect of each problem to get to the correct solution as quickly and efficiently as possible.
The P0740 code can be very serious as it can cause drivability issues. This is one of the codes that can leave a driver stranded on the side of the road. A good running engine means nothing without a properly operating transmission to transfer the engine power to the wheels. It is a good idea to have this issue diagnosed and repaired as soon as possible.
Repairs that can fix the P0740 code may include:
In order to help prevent trouble codes such as the P0740 code, it is a good idea to replace the transmission fluid in your vehicle along with the filter (if applicable) at the recommended intervals. Doing this will ensure that the internal parts of the transmission stay well lubricated and also prevents debris from causing a restriction within the transmission.
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.