Normal Operation
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- DTC U0121 (Lost Communication With Anti-Lock Brake System [ABS] Control Module) - sets in continuous memory in the Instrument Cluster (IC) if the data messages received from the ABS module over the High Speed Controller Area Network (HS-CAN) are missing. For a complete list of all network messages, refer to MODULE COMMUNICATIONS NETWORK .
This pinpoint test is intended to diagnose the following:
- ABS module
- IC