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.
ATC Messages Not Received
Monitored & Set Condition
- When Monitored: With the ignition in RUN position and the IOD fuse installed.
- Set Condition: The BCM does not receive any messages from the Automatic Temperature Control (ATC) module for at least 18 seconds.
Possible Causes:
- Attempt To Communicate With The Automatic Temperature Control Module
- Body Control Module
Testing
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select BODY, then AUTOMATIC TEMP CONTROL. If scan tool communicates with Automatic Temperature Control (ATC) module, go to next step. If scan tool does not communicate with ATC module, perform BUS +/- SIGNALS OPEN OR NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL MODULE test.
- Turn ignition off. Using scan tool, clear DTCs. Turn ignition on and wait one minute. Using scan tool, retrieve DTCs. If ATC MESSAGES NOT RECEIVED DTC resets, replace Body Control Module (BCM). See BODY CONTROL MODULE under REMOVAL & INSTALLATION. If ATC MESSAGES NOT RECEIVED DTC does not reset, fault may be intermittent. Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMS . Repair any problems found as necessary. If no problems are found, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, test is complete.
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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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