NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart .

DTC	Description	Action to Take
U0140:00	Lost Communication With Body Control Module: No Sub Type Information	GO to Pinpoint Test Z .
U0164:00	Lost Communication With HVAC Control Module: No Sub Type Information	REFER to Module Communications Network to diagnose lost communication with the HVAC module.
U0422:68	Invalid Data Received From Body Control Module: Event Information	RETRIEVE and REPAIR all non-network DTCs in the BCM. REFER to Multifunction Electronic Modules DTC Chart.
U3000:41	Control Module: General Checksum Failure	INSTALL a new Rear Heating Ventilation Air Conditioning (RHVAC) module. REFER to Auxiliary Climate Control .
U3003:16	Battery Voltage: Circuit Voltage Below Threshold	GO to Pinpoint Test G .
U3003:17	Battery Voltage: Circuit Voltage Above Threshold	GO to Pinpoint Test G .
All Other DTCs	-	REFER to Multifunction Electronic Modules .

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.

Safety Warning

Rear Heating Ventilation Air Conditioning Module