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 1699 (ENGINE CONTROLS AND FUEL - 6.6L - DTC P1448 TO DTC P2510)DTC P2002CIRCUIT/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 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the integrity of the entire exhaust system by visually inspecting for the following conditions:
- Any damaged components
- Improper installation-The exhaust differential pressure lines should have a continuous downward gradient, without sharp kinks, from the differential pressure sensor to the particulate filter.
- Improperly routed exhaust differential pressure sensor lines-The smaller line connects to the front of the exhaust particulate filter and the smaller port of the exhaust pressure sensor.
- Completely restricted differential pressure sensor lines.
- Verify the integrity of the entire air induction system by inspecting for the following conditions:
- Restrictions in the air induction system and the turbocharger system
- Leaks in the intake air ducts and the turbocharger ducts
- Cracked or damaged MAF sensor housing
- Inspect for a dirty air filter element
- Debris blocking the air sensing filaments of the MAF sensor
- If a condition is found, repair as necessary.
- Test the charge air cooler system for leaks. Perform the Full System Air Leak Test in Charge Air Cooler Diagnosis (Induction System Smoke Test)
or Charge Air Cooler Diagnosis (Full System Air Leak Test)
or Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test)
.
- If a charge air cooler leak is found, repair as necessary.
- Test the engine air induction system for leaks. Perform the Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Smoke Test)
or Charge Air Cooler Diagnosis (Full System Air Leak Test)
or Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test)
.
- If an induction air leak is found, repair as necessary.
- If the air intake system, exhaust system, DPF components, and the charge air cooler test normal, replace the particulate filter.
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.