What does code P1643 mean?

P1643 · JaguarCAN Link Engine Control Module Transmission Control Module Circuit Network

P1643 on a Jaguar means the engine control module (ECM) has lost or detected a fault in the controller area network (CAN) communication link that carries data between the ECM and the transmission control module (TCM). The ECM monitors the CAN bus circuit for missing or corrupted messages from the TCM and stores this code when the expected data stream is interrupted or implausible.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

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