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 U0121:00 (Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub-Type Information) - sets in continuous memory in the Transfer Case Control Module (TCCM) if data messages received from the ABS module over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or longer with ignition in RUN and battery voltage in range. For a complete list of all network messages, refer to
MODULE COMMUNICATIONS NETWORK
.
This pinpoint test is intended to diagnose the following:
- ABS module
- TCCM