DTC codes / Volkswagen codes / P1652
P1652 is a Volkswagen-specific code that the engine control module (ECM) sets when it cannot retrieve or validate the fault memory stored in the transmission control module (TCM). The ECM is essentially telling you that the transmission computer has diagnostic trouble codes (DTCs) of its own that need to be read, or that communication with the TCM has failed.
Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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