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P0702 is a diagnostic trouble code (DTC) for "Transmission Control System 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 for $79.99. 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.
Storage of a P0702 trouble code signifies that the Powertrain Control Module (PCM) has detected a problem with the automatic transmission control system. Related trouble codes include P0700 and P0701.
A P0702 trouble code means that one of the transmission's sensors, solenoids, or switches has sent a signal to the PCM of the detection of a reading that doesn't match the manufacturer's specifications. In addition, the PCM can store a P0702 trouble code when other transmission-related trouble codes are stored.
Some of the more common causes of a P0702 trouble code include the slippage of a transmission component, failure of the torque converter clutch, and shift solenoid failure. A low fluid condition in the transmission can also cause the storage of a P0702 trouble code to the PCM. Faulty sensors, solenoids, or switches can cause a P0702 trouble code, as well as any faulty wiring or connectors.
Some of the symptoms often associated with a P0702 trouble code include:
To properly diagnose a P0702 trouble code, a mechanic needs a suitable code reader, a manufacturer's wiring schematic, and a digital volt/ohmmeter. The mechanic should also perform the following when diagnosing the code:
A common misdiagnosis is for the mechanic to rebuild the transmission and replace the torque converter in the belief that this can fix the problem. Oftentimes, a fix is as simple as replacing a faulty component or wiring.
A P0702 trouble code, if left unfixed, can lead to catastrophic failure of the transmission, especially in a low fluid condition. A mechanic should attempt to fix and clear other trouble codes related to the transmission before trying to fix this code, since this code is sometimes associated with other transmission-related codes.
With a P0702 trouble code serving as an informational code for other more specific problems, dealing with the other codes first can often fix and clear the code. If the code returns after fixing all other transmission problems, the mechanic should attempt the following repairs:
The storage of a P0702 trouble code is an indicator of more specific transmission problem and usually precedes the storage of a more specific transmission-related trouble code. This code is specific to vehicles with an automatic transmission, and if found on a vehicle with a manual transmission, it indicates a faulty PCM.
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