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Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.6L (LGH) - DTC P0016 Through DTC P11DC >> Diagnostic Information and Procedures >> DTC P0420 >> Testing >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P003A, P0047, P0048, P0101, P0201-P0208, P02E0, P02E2, P02E3, P02E7-P02E9, P02EB, P0300-P0308, P0402, P0545, P0546, P1048, P1049, P10CC, P10CD, P10CE, P2032, P2033, P2047, P2048, P2049, P20CB, P20CC, P20CD, or P20CE is not set.
  2. Engine running, observe the DTC information with a scan tool. DTC P0420 should not be set.
  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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