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Home >> Chevrolet >> 2006 >> Uplander Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.5L - DTC P0220 To DTC P0455 >> DTC P0401 >> Repair Verification
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Repair Verification

  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  5. Observe the EGR Flow Test Count parameter on the scan tool. EGR Flow Test counts may need to be as many as 16 to pass this DTC after the DTCs have been cleared.
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