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.
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HOMESERVICE MANUALSCHEVROLET2002AVALANCHE 2500 4WD V8-8.1L VIN GREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONPROGRAMMING AND RELEARNING
2002 Chevrolet Avalanche 2500 4WD V8-8.1L VIN G
Programming and Relearning
2002 Chevrolet Avalanche 2500 4WD V8-8.1L VIN GSECTION Programming and Relearning
The HVAC control module will relearn the actuator limits whenever power is disconnected and re-connected to the module.
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module.
IMPORTANT:
- The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.
- Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.
3. Wait 60 seconds.
4. Install the fuse.
5. Turn ON the ignition.
6. Wait 60 seconds before installing a scan tool.
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module.
IMPORTANT:
- The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.
- Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.
3. Wait 60 seconds.
4. Install the fuse.
5. Turn ON the ignition.
6. Wait 60 seconds before installing a scan tool.
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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.