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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P0016 TO DTC P0299)DTC P0299CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- 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 (Full System Air Leak Test) or Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) or Charge Air Cooler Diagnosis (Induction System Smoke 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.