P0702 OBD Error Code: Problem & Solutions

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Baffled? Don’t know how to diagnose and treat the error code P0702? Well, this brief guide from Parts Avatar will undoubtedly clear all queries regarding the OBD code. A constantly flashing P0702 trouble code signals at the powertrain control module’ (PCM) detection of a malfunction within the automatic transmission control system. The trouble codes sharing similarities with the code P0702 are P0701 and P0700.

A P0702 trouble code is triggered after a signal being sent to the PCM of a reading failing to match manufacturer’s specifications. These signals are transmitted by one of the transmission sensors, solenoids or switches. Also, the PCM sets in a P0702 trouble code when other transmission-related trouble codes are stored too.

What causes this problem with the Transmission Control System Electrical?

• A malfunctioning transmission control module (TCM)
• The transmission control module (TCM) harness shorted circuited or open
• A weak electrical connection in the transmission control module (TCM)

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Concerned to know the symptoms to OBD code P0702? If yes, then you have landed at the right place. We at Parts Avatar have listed out few common symptoms associated with Transmission Control System Electrical

Common Symptoms

• No obvious symptoms
• A failure in the transmission
• A slippage in the transmission
• Excessively heating transmission
• Problem in shifting
• Failing to shift
• Engine halt when coming to a stop

This OBD code P0702 serves as an informative code for a various number of problems, it should be noted that dealing with the other codes first can often fix and clear the code. Even if the code pops up after fixing all other transmission problems, the technician should start with the following repairs:

• All the distorted wiring, connectors, or components should be repaired or replaced.
• The transmission should be restored by executing a fluid flush, and changing the torque converter if the transmission has suffered excessive damage for a low fluid condition that was allowed to go on for too long.
• Moreover, in a low fluid condition, the transmission should be filled to an appropriate level to mend any leaks. Afterwards, the technician should fill the transmission with fluid to the appropriate level.
• Any damaged sensors, solenoids or switches should be restored or repaired.
• A malfunctioning hydraulic pump should be attended and replaced.
• The code will end up being stored in a vehicle with a manual transmission, if a faulty PCM is not replaced.

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In order to precisely diagnose the error code P0702 the technician will need a suitable code reader, a manufacturer’ wiring scheme and a digital volt/ohmmeter. The following should be performed while diagnosing the error code P0702

• A visual inspection should be performed of the wirings and the connectors to the PCM, utilizing the manufacturer’ scheme for guidance.
• The scanner should be connected to the diagnostic connection to download all the freeze frame data and codes stored.
• Now that all the wirings, connectors, and components have restored or repaired, the technician should next clear the code and take the vehicle for a test drive to see if the code reappears.

Common Mistakes When Diagnosing the P0702 Code

Here listed are a few common mistakes that should be avoided while diagnosing the error code P0702

A basic mistake committed leading to a misdiagnose is when the technician rebuilds the transmission and replaces the torque converter believing that it would cure the problem. Many a times, a fix can be as simple as replacing the faulty part or wiring.