BMW DTC U0121 – Lost Communication With Anti-Lock Brake System (ABS) Control Module
DTC U0121 meaning on BMW
DTC U0121 on a BMW indicates a communication error between the vehicle’s Engine Control Module (ECM) and the Anti-Lock Brake System (ABS) Control Module. This error code specifically points to a lost communication with the ABS control module.
BMW DTC U0121 symptoms
Symptoms of DTC U0121 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Stability control system malfunction
- Loss of ABS functionality
- Braking system issues
BMW DTC U0121 causes
The common causes of DTC U0121 on a BMW are:
- Faulty ABS control module
- Wiring or connection issues between the ECM and ABS control module
- Corrosion or damage to the communication lines
BMW DTC U0121 seriousness
DTC U0121 should be addressed promptly as it affects the communication between critical systems in the vehicle. Ignoring this issue can lead to potential safety hazards and compromised braking performance.
How to diagnose DTC U0121 on BMW
To diagnose DTC U0121 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connections between the ECM and ABS control module
- Check for any signs of corrosion or damage in the communication lines
- Test the ABS control module for functionality
How to fix DTC U0121 on BMW
To fix DTC U0121 on a BMW, you can:
- Repair or replace any damaged wiring or connections
- Replace the faulty ABS control module
- Clean or repair any corroded communication lines
How to erase DTC U0121 on BMW
To erase DTC U0121 on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- After fixing the underlying issue, perform a test drive to ensure the error code does not reappear