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 CE: Abs Module Communication Concern With HVAC Module
Normal Operation and Fault Conditions
With the ignition ON, the HVAC control module sends messages to the GWM over the MS-CAN, The GWM relays these messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a HVAC control module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the HVAC control module, refer to Network Message Chart
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U0164:00 | Lost Communication With HVAC Control Module: No Sub Type Information | This DTC sets when the ABS module does not receive any autohold messages from the HVAC module within the allowed time. |
| ABS U0424:00 | Invalid Data Received From HVAC Control Module: No Sub Type Information | This DTC sets when the ABS module receives the autohold messages from the HVAC module, but the messages contain invalid data. |
| ABS U0424:86 | Invalid Data Received From HVAC Control Module: Signal Invalid | This DTC sets when the ABS module receives the autohold messages from the HVAC module, but the messages contain invalid data. |
Possible Sources
- Network communication concern
- GWM
- HVAC control module
Pinpoint Tests CE: ABS Module Communication Concern With HVAC
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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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