Pinpoint Test C : DTC (Diagnostic Trouble Code) U0121:87: Notes
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 through the GWM are missing. |
Possible Sources
- BCM
- ABS module
- GWM