What does code P1605 mean?

Q: What does code P1605 mean?

AT Diagnostic Communication Line. 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.

DTC codes / Nissan codes / P1605

P1605 · NissanAT Diagnostic Communication Line

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.

SystemPowertrain

Code typeNissan specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.