Pinpoint Test C : U0121:87: Notes
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Wiring Diagram 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 - System Operation and Component Description .
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 are missing. |
Possible Sources
- Communication network concern
- Battery voltage concern
- ABS module
- BCM