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 1534 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE DOES NOT AUTOSTOPCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Verify no HPCM or ECM DTCs are set. Repair any HPCM or ECM DTCs prior to performing this diagnostic procedure.
- Engine at idle, observe the HPCM Autostop Inhibit Reasons and Hybrid Batt Max Cell Temp scan tool parameters.
- Compare the parameter display to the Typical Scan Tool Data information.
- Identify which Autostop inhibit conditions have prohibited Autostop operation. An Inhibit condition will display YES on the scan tool.
- Determine if the Autostop inhibit conditions are the result of normal operating conditions or the result of a fault condition.
- Repair the conditions that are the result of a fault condition. For example, a hood switch that indicates hood status as open when the hood is actually closed.
- Advise the vehicle operator of the normal operating conditions that will normally inhibit Autostop. For example, advise that Autostop is disabled when Hybrid Battery temperature is less than 10°C (50°F).
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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.