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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1766 (WIRING SYSTEMS AND POWER MANAGEMENT - INTRODUCTION)DESCRIPTION AND OPERATIONPOWER MODE DESCRIPTION AND OPERATIONPOWER MODEECM AND TCM POWER MODE BACKUP STRATEGY
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
ECM and TCM Power Mode Backup Strategy
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION ECM and TCM Power Mode Backup Strategy
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
The ECM and TCM remain in the last known power mode state until it can determine its backup system power mode based on their discrete Accessory voltage and Run/Crank Ignition 1 voltage inputs.
| Accessory Voltage State | Run/Crank Ignition 1 Voltage State | Power Mode Determined |
|---|---|---|
| Inactive | Inactive | Off |
| Active | Inactive | Accessory |
| Active | Active | Run |
| Inactive | Active | Crank |
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.