DTC codes / U03xx · Software and configuration mismatches / U0302
U0302 is a network communication fault indicating that the engine control module or another primary controller has detected a software incompatibility with the transmission control module (TCM). The computer has compared software version, calibration identifiers, or configuration data between modules and found a mismatch that prevents normal coordinated operation.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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