DTC U0121-86: Lost communication with Anti-lock Brake System (ABS) Control Module - Signal invalid: Action
- Check the Anti-lock Brake System Module for stored DTCs. Using the manufacturer approved diagnostic system, complete the CAN Network Integrity test. Refer to the appropriate electrical circuit wiring diagrams and check the CAN network between the Adaptive Front Lighting System (AFS) Control Module and the Anti-lock Brake System Module