Pinpoint Test ZA: C0078:56: Notes
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation and Fault Conditions
The BCM is programmed with vehicle tire size information during the module configuration step. The BCM shares tire size information with other module over the HS-CAN. When this DTC sets, the ABS module sends a message to the IPC to illuminate the ABS warning indicator.
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C0078:56 | Tire Diameter: Invalid/Incompatible Configuration | If the tire size message sent to the ABS module from the BCM contains invalid data, this DTC sets. |
Possible Sources
- Temporary or mini-spare tire in use
- Under inflated tires
- Mismatched sized wheels and tires
- Network communication concern
- Incorrect BCM configuration