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 28 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DRIVE CYCLESINSPECTION/MAINTENANCE SYSTEM CHECKDIAGNOSTIC PROCEDURES
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Diagnostic Procedures
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Many DTC related repairs will instruct the technician to clear DTC information. This procedure will reset ALL I/M System Status indicators to NO, and require performing the I/M Complete System Set Procedure.
- Perform powertrain diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. Repair any DTCs or driveability concerns that would prevent I/M System Status tests from completing. Did you find and repair a DTC or driveability concern? If yes, go to step 3. If no, go to next step.
- Review any service bulletins for software updates that may prevent I/M readiness. Perform any reprogramming or repairs indicated by the service bulletins. Was a repair service required? If yes, see INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE . If no, go next step.
- Using scan tool, observe I/M SYSTEM STATUS display. Is more than one test indicating a NO status? If yes, see INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE . If no, go to appropriate INSPECTION/MAINTENANCE SYSTEM SET procedure for the indicated system.
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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.