BMW DTC U11AB – Lost Communication With Torque Request Crankshaft Transmission Data via FA-CAN
DTC U11AB meaning on BMW
The DTC U11AB code on a BMW indicates a communication error between the engine control module (ECM) and the transmission control module (TCM). Specifically, it signifies a lost communication with the torque request crankshaft transmission data via the FA-CAN (FlexRay Communication on the Controller Area Network) network.
BMW DTC U11AB symptoms
Symptoms of the BMW DTC U11AB code may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Transmission shifting issues
- Reduced engine performance
- Vehicle going into limp mode
BMW DTC U11AB causes
Common causes of the BMW DTC U11AB code include:
- Faulty wiring or connectors in the CAN network
- Defective ECM or TCM
- Interference from other electronic components
- Software issues
BMW DTC U11AB seriousness
The DTC U11AB code should be addressed promptly as it can lead to drivability issues and potential damage to the vehicle’s drivetrain components. Ignoring this code may result in further transmission problems and reduced overall vehicle performance.
How to diagnose DTC U11AB on BMW
To diagnose the DTC U11AB code on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM and TCM
- Inspect the wiring and connectors in the CAN network for any damage or corrosion
- Check for any loose connections or poor grounds
- Perform a communication test between the ECM and TCM
How to fix DTC U11AB on BMW
To fix the DTC U11AB code on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connectors in the CAN network
- Ensure all connections are secure and free of corrosion
- Update the ECM and TCM software to the latest version
- Replace the ECM or TCM if found to be faulty
How to erase DTC U11AB on BMW
To erase the DTC U11AB code on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the ECM and TCM. After the repair has been completed and the underlying issue resolved, the code can be erased to reset the Check Engine Light and ensure proper operation of the vehicle.
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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