What does code P1746 mean?

Q: What does code P1746 mean?

Transmission Control Module Output Stage. P1746 on a BMW indicates that the Transmission Control Module (TCM) has detected an electrical fault in one of its output driver circuits, often the solenoid power supply or a specific actuator driver. The TCM monitors the voltage and current on its output stages and sets this code when the expected electrical load is not present, signaling an open circuit, short, or failed driver inside the module.

DTC codes / BMW codes / P1746

P1746 · BMWTransmission Control Module Output Stage

P1746 on a BMW indicates that the Transmission Control Module (TCM) has detected an electrical fault in one of its output driver circuits, often the solenoid power supply or a specific actuator driver. The TCM monitors the voltage and current on its output stages and sets this code when the expected electrical load is not present, signaling an open circuit, short, or failed driver inside the module.

SystemPowertrain

Code typeBMW specific

SeverityHigh

Fix difficultyProfessional

AreaTransmission

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