Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test D: Abs (Anti-Lock Brake System) Module Communication Concern With The BCM (Body Control Module)
Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.
Normal Operation and Fault Conditions
With the ignition ON, the BCM sends messages to the GWM over the HS-CAN1, the GWM relays these messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). For information on the messages sent to the ABS module by the BCM, 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 U0140:87 | Lost Communication With Body Control Module: Missing Message | Sets when the ABS module is missing any of the BCM messages. This can be due to a BCM failure, a circuit failure on the HS-CAN or an excessive load on the network. |
| ABS U0422:86 | Invalid Data Received From Body Control Module: Signal Invalid | Sets if the ignition status message from the BCM is received with invalid or incorrect data. |
Possible Sources
- Network communication concern
- Over or under voltage concerns
- BCM
- GWM
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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