Pinpoint Test C : U0121:87: Notes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions
The BCM communicates with the ABS module through the GWM. REFER to: Communications Network .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0121:87 | Lost Communication With Anti-Lock Brake System (ABS) Control Module: Missing Message | A continuous memory DTC that sets in the BCM if ABS messages received from the ABS module through the GWM are missing. |
Possible Sources
- Communication network concern
- Battery voltage concern
- ABS module
- BCM