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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1174 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - DTC P154B TO DTC P2693)DTC P2002CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION 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 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 bends or 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.
- Remove the exhaust differential pressure sensor lines. Visually inspect the lines for restrictions.
- If a condition is found, replace the exhaust differential pressure 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. Refer to Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test)
or Charge Air Cooler Diagnosis (Full System Air Leak Test)
.
- If a charge air cooler leak is found, repair as necessary.
- Test the engine for gaskets leaks.
- If an engine gasket 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.