Pinpoint Test I : DTC (Diagnostic Trouble Code) U0121:87: Notes
WARNING: This page is about a different car, the 2018 Ford Focus. 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 SODL and SODR communicate with the ABS module through the BCM.
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 SODL and SODR if ABS messages received from the ABS module over the HS-CAN through the BCM are missing for 2 seconds or more. |
Possible Causes
- Communication network concern
- BCM concern
- ABS module concern
- ABS module