What does code P1746 mean?

Q: What does code P1746 mean?

Transmission Control Unit Relay Malfunction. P1746 on a Volkswagen means the transmission control module (TCM) has detected a fault in the relay that supplies its own power, so the TCM cannot confirm the relay is switching correctly. The computer monitors the relay's control circuit and the voltage it delivers, and it sets this code when the expected voltage is missing or present when it should not be.

DTC codes / Volkswagen codes / P1746

P1746 · VolkswagenTransmission Control Unit Relay Malfunction

P1746 on a Volkswagen means the transmission control module (TCM) has detected a fault in the relay that supplies its own power, so the TCM cannot confirm the relay is switching correctly. The computer monitors the relay's control circuit and the voltage it delivers, and it sets this code when the expected voltage is missing or present when it should not be.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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