DTC codes / Honda codes / P1660
P1660 on Honda vehicles indicates a failure in the serial data communication line between the automatic transmission (A/T) control module and the engine control module (ECM) or powertrain control module (PCM). The ECM/PCM has detected that the data stream carrying transmission operating parameters is missing, intermittent, or corrupted, so it can no longer reliably coordinate engine and transmission operation.
Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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