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 1065 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - DTC P0016 TO DTC P0299)DTC P0299CIRCUIT/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 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the integrity of the air induction system, the turbocharger ducts and hoses by inspecting for the following conditions:
- Any damaged components
- Any loose or improperly installed components
- A wet or restricted air filter
- Any exhaust leaks before the turbocharger
- Any exhaust restrictions after the turbocharger
- Any snow or ice build-up in cold climates at the air cleaner and MAF sensor
- Any water, snow, ice build-up, restrictions or coking at the MAP sensor
- Test the charge air cooler for leaks. Refer to Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) or Charge Air Cooler Diagnosis (Full System Air Leak Test) .
- Test the turbocharger oil supply feed. Refer to Turbocharger Lack of Oil Supply .
- Inspect the turbocharger oil supply tube for restrictions.
- If a restriction is found, clean or replace the oil supply tube as necessary.
- Inspect the turbocharger for debris, worn impeller and turbine blades, or damage Refer to Turbocharger Cleaning and Inspection
.
- If worn or damaged turbocharger blades or vanes are found, replace the turbocharger assembly.
- If the induction system, charger air cooler system, the turbocharger, and the turbocharger oil supply test normal, replace the MAP sensor.
IMPORTANT:
Perform the Repair Verification after completing the Circuit/System Testing.
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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.