DTC codes / Nissan codes / P1605
P1605 on Nissan vehicles indicates that the automatic transmission (AT) control module has detected a communication fault on the diagnostic line that links it to the engine control module (ECM) or other onboard controllers. The transmission computer is not receiving or sending the expected serial data, so it sets this code and may default to a limp-home mode.
Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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