BMW DTC U11B4 – Lost Communication With Torque Request Crankshaft Transmission Data2 via A-CAN
DTC U11B4 meaning on BMW
The DTC U11B4 on a BMW indicates a communication error with the Torque Request Crankshaft Transmission Data2 module via the A-CAN network. This error code signifies that the Engine Control Module (ECM) is unable to receive or transmit data properly with the specified module.
BMW DTC U11B4 symptoms
Symptoms of the DTC U11B4 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Transmission shifting issues
- Vehicle may go into limp mode
BMW DTC U11B4 causes
Possible causes of the DTC U11B4 on a BMW include:
- Faulty Torque Request Crankshaft Transmission Data2 module
- Wiring or connection issues in the A-CAN network
- ECM software or hardware problems
BMW DTC U11B4 seriousness
The DTC U11B4 error code should not be ignored as it can lead to drivability issues and potential damage to the vehicle if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC U11B4 on BMW
To diagnose the DTC U11B4 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the A-CAN network wiring and connections for any damage or corrosion
- Check the Torque Request Crankshaft Transmission Data2 module for proper operation
- Verify the ECM software version and perform any necessary updates
How to fix DTC U11B4 on BMW
To fix the DTC U11B4 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connections in the A-CAN network
- Replace the faulty Torque Request Crankshaft Transmission Data2 module if necessary
- Update the ECM software to the latest version
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC U11B4 on BMW
To erase the DTC U11B4 on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the ECM memory. After clearing the codes, it is recommended to perform a test drive to confirm that the issue has been resolved successfully.
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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