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, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 231 (BODY CONTROL MODULES)SYSTEM TESTSNOTES

2002 Chevrolet Avalanche 2500, RWD

System Tests: Notes

2002 Chevrolet Avalanche 2500, RWDSECTION Notes

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM INDEX

Symptom	Perform Test
Scan Tool Does Not Power Up	A
Scan Tool Does Not Communicate With Class 2 Device	B
Power Mode Mismatch	C
Retained Accessory Power On After Timeout	D
Retained Accessory Power Inoperative	E

RENDER: 1.0x

NO RELATED

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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.