Pinpoint Test H : U0121:87: Notes
WARNING: This page is about a different car, the 2015 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 Operations and Fault Conditions
With the ignition ON, the ABS module sends messages to the EPB module over the HS-CAN2. If the EPB module does not receive these messages within the specified time frame, the EPB module sets a DTC. This can be due to an ABS module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the EPB module by the ABS module, REFER to: Parking Brake - 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 | This DTC sets in continuous memory if the EPB module does not receive any network messages from the ABS module. |
Possible Sources
- Wiring, terminals or connectors
- Network communication concern
- ABS module
- EPB module