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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1076 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - DTC P154B TO DTC P2693)DTC P244CCIRCUIT/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.
- Inspect the DOC for any of the following abnormal conditions:
- Physical damage or alterations
- Internal rattles caused by a damaged catalyst substrate
- Internal restrictions-Refer to Restricted Exhaust .
- If a condition is found, replace the DOC.
- Inspect the exhaust system for the following conditions:
- Restrictions-Refer to Restricted Exhaust .
- Exhaust leaks before DPF
- Physical damage or alterations
- If a condition is found, repair the exhaust system as necessary.
- Inspect for the following conditions, which may cause a DOC to degrade:
- An engine misfire
- Engine oil or coolant consumption
- Leaking fuel injectors
- A fuel that does not meet the ultra low sulfur requirements, red dye fuel, or off road diesel fuel
- Contaminated fuel-Refer to Contaminants-in-Fuel Diagnosis .
- If a condition is found, repair as necessary, then replace the DOC.
- If all inspections and tests are normal, replace the DOC.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.