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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510) >> DTC P0402 >> Component Testing

Component Testing

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  1. Using the output controls on the scan tool command the EGR position to 10 percent.
    • If the actual EGR position remains stationary replace the EGR valve.
  2. Spray the EGR valve gaskets and EGR cooler gaskets with a soap solution. Start the engine. Command the turbocharger vane position control solenoid ON to 100 percent and inspect for leaks around the EGR valve gaskets.
    • If a leak is found replace the EGR valve gasket.
  3. Remove the EGR valve. Refer to Exhaust Gas Recirculation Valve Replacement and inspect that the EGR is not stuck, that there are no leaks or restrictions in the EGR valve and EGR passages, and that there is no debris or damage that can cause the EGR valve to stick partially open or partially closed.
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