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.
Normal Operation and Fault Conditions
With the ignition ON, the IPC and PCM communicate with the ABS module through the GWM. The IPC sends messages to the GWM over the MS-CAN, the PCM uses the HS-CAN1. The GWM transmits the 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 DTCs. For information on the messages sent to the ABS module by the IPC and PCM, refer to the Network Message Chart in Description and Operation in the Anti-Lock Brake System (ABS) and Stability Control article.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0155:00 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information | This DTC when the ABS module does not receive any messages from the IPC. This can be due to a IPC failure, a circuit failure on the HS-CAN or an excessive load on the network. |
| U0155:68 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: Event Information | This DTC when the ABS module does not receive the following messages from the IPC; selectable drive mode display, selectable drive mode test reset, hill descent control switch, odometer master value, or traction control switch. This can be due to a IPC failure, a circuit failure on the HS-CAN or an excessive load on the network. |
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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.