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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P244C >> Circuit/System Testing

Circuit/System Testing

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  1. 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.
  2. 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.
  3. 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.
  4. If all inspections and tests are normal, replace the DOC.
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