Pinpoint Test B : DTC (Diagnostic Trouble Code) U0121:00 Or P1934:87: Notes
WARNING: This page is about a different car, the 2016 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation and Fault Conditions
The BCM communicates with the ABS module over the HS-CAN. Refer to: Communications Network - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0121:00 | Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information | A continuous memory DTC that sets in the BCM if ABS messages received from the ABS module over the HS-CAN are missing. |
| P1934:87 | Vehicle Speed Signal: Missing Message | A continuous memory DTC that sets in the BCM if ABS vehicle speed messages received from the ABS module over the HS-CAN are missing. |
Possible Sources
- Communication network concern
- Battery voltage concern
- ABS Module
- BCM