BMW DTC P1746 – Transmission Control Module Output Stage Error
DTC P1746 meaning on BMW
The DTC P1746 on a BMW indicates a Transmission Control Module (TCM) Output Stage Error. This fault code is triggered when the TCM detects an issue with the output stage, which controls various functions within the transmission system.
BMW DTC P1746 symptoms
Symptoms of the BMW DTC P1746 may include harsh shifting, transmission slipping, delayed engagement, or the transmission going into limp mode. Additionally, the vehicle may display a warning light on the dashboard indicating a transmission fault.
BMW DTC P1746 causes
The common causes of the BMW DTC P1746 include a faulty transmission control module, damaged wiring or connectors, internal transmission issues, or a malfunctioning solenoid within the transmission system.
BMW DTC P1746 seriousness
The DTC P1746 should be addressed promptly as it can lead to further damage to the transmission system if left unresolved. Driving with this fault can result in poor vehicle performance and potential safety hazards.
How to diagnose DTC P1746 on BMW
To diagnose the DTC P1746 on a BMW, a professional diagnostic scanner capable of reading transmission fault codes is required. The technician will perform a thorough inspection of the transmission system, check the wiring and connectors for any damage, and conduct tests to identify the specific cause of the fault.
How to fix DTC P1746 on BMW
Fixing the BMW DTC P1746 typically involves repairing or replacing the faulty transmission control module, addressing any damaged wiring or connectors, or resolving internal transmission issues. It is recommended to consult with a qualified mechanic or dealership to accurately diagnose and repair the problem.
How to erase DTC P1746 on BMW
Once the BMW DTC P1746 has been diagnosed and fixed, the fault code can be erased using a diagnostic scanner. The technician will clear the code from the TCM memory, and if the issue has been successfully resolved, the warning light should no longer appear on the dashboard.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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