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 972 (BODY CONTROL SYSTEM)
2002 Chevrolet Avalanche 2500, RWD
Section 972 (Body Control System)
2002 Chevrolet Avalanche 2500, RWDSECTION Section 972 (Body Control System)
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Body Control System
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B0008: In Park Switch Circuit High
- DTC B1000: Electronic Control Unit (ECU) Performance
- DTC B1004: Electronic Control Unit Identification Circuit
- DTC B1007: EEPROM Read/Write Error
- DTC B1009: EEPROM Checksum Mismatch
- DTC B1440: Power Mode Master Input Circuits Mismatch
- DTC B1507 or B1508: High Power Control Circuit Low/High
- DTC C0550: Electronic Control Unit (ECU) Performance
- Symptoms - Body Control System
- Power Mode Mismatch
- Control Module References
- Repair Instructions
- Description and Operation
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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.