BMW DTC U1254 – Message Monitoring Torque Request Crankshaft Transmission Data via A-CAN Signal Error
DTC U1254 meaning on BMW
DTC U1254 on a BMW refers to a Message Monitoring Torque Request Crankshaft Transmission Data via A-CAN Signal Error. This diagnostic trouble code indicates a communication error related to the torque request signal being sent from the crankshaft to the transmission control module over the A-CAN network.
BMW DTC U1254 symptoms
Symptoms of DTC U1254 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Transmission shifting issues
- Reduced engine performance
- Vehicle going into limp mode
BMW DTC U1254 causes
Common causes of DTC U1254 on a BMW include:
- Faulty A-CAN network communication
- Defective crankshaft sensor
- Issues with the transmission control module
- Wiring or connection problems
BMW DTC U1254 seriousness
DTC U1254 should be addressed promptly as it can lead to drivability issues and potential damage to the transmission system. Ignoring this fault may result in further complications and increased repair costs.
How to diagnose DTC U1254 on BMW
To diagnose DTC U1254 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Check the A-CAN network for communication errors
- Inspect the crankshaft sensor for proper operation
- Test the transmission control module for faults
- Inspect wiring and connections for any damage or corrosion
How to fix DTC U1254 on BMW
To fix DTC U1254 on a BMW, consider the following:
- Repair any wiring or connection issues
- Replace the faulty crankshaft sensor if necessary
- Address any faults in the transmission control module
- Reset the fault codes and test drive the vehicle to confirm the issue is resolved
How to erase DTC U1254 on BMW
To erase DTC U1254 on a BMW, use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. After clearing the codes, perform a test drive to ensure the issue has been resolved and the fault code does not return.
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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