Normal Operation
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. 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 the Trailer Brake Control (TBC) module if data messages such as brake torque information are not received from the ABS module. For a complete list of all network messages, refer to MODULE COMMUNICATIONS NETWORK .
This pinpoint test is intended to diagnose the following:
- ABS module
- TBC module