Pinpoint Test J : Lost Communication With Abs (Anti-Lock Brake System) Control Module: Notes
WARNING: This page is about a different car, the 2015 Lincoln MKZ. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to: Diagnostic Methods .
Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions
The ABS, GSM and TRCM use information contained in messages on the HS-CAN.
NOTE:
If a GSM self-test is performed, make sure the drivers door is closed and locked.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0121 | Lost Communication With Anti-Lock Brake System (ABS) Control Module | This DTC sets if the TRCM and/or the GSM does not receive some or all of an expected message from the ABS module. |
Possible Sources
- Connectors damaged or pushed-out terminals, circuitry open, shorted to power or shorted to ground
- ABS module