What does code P1611 mean?

Q: What does code P1611 mean?

Serial Communicating Link Transmission Control Module. P1611 on BMW vehicles indicates that the transmission control module (TCM) has lost or cannot establish reliable serial communication with the engine control module (ECM) over the internal controller area network (CAN) or serial data link. The ECM or a gateway module has detected missing, corrupted, or timed-out messages from the TCM, so it flags the communication fault and may illuminate the warning light.

DTC codes / BMW codes / P1611

P1611 · BMWSerial Communicating Link Transmission Control Module

P1611 on BMW vehicles indicates that the transmission control module (TCM) has lost or cannot establish reliable serial communication with the engine control module (ECM) over the internal controller area network (CAN) or serial data link. The ECM or a gateway module has detected missing, corrupted, or timed-out messages from the TCM, so it flags the communication fault and may illuminate the warning light.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

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