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 MANUALSGMC2004ENVOY XL 5.3 P, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (BODY CONTROL SYSTEM)
2004 GMC Envoy XL 5.3 P, 4WD
Section 3 (Body Control System)
2004 GMC Envoy XL 5.3 P, 4WDSECTION Section 3 (Body Control System)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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 B1000: ECU Malfunction
- DTC B1004: Keep Alive Memory (KAM) Reset
- DTC B1007: EEPROM Write Error
- DTC B1009: EEPROM Checksum Mismatch
- DTC B1397: Device Voltage Reference Output Circuit Low
- DTC B1422: Device Power Moding Error
- DTC B1440: Power Mode Master Input Circuits Mismatch
- 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.