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Home >> Buick >> 2006 >> Lucerne CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.8L - DTC P0201 To DTC P0452 >> DTC P0401 >> Circuit/System Verification
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Circuit/System Verification

  1. If DTCs P0107, P0108, P0403, P0404, P0405 or P0406 are also set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. Operate the vehicle within the Conditions for Running the DTC. Observe the EGR Flow Test Count parameter on the scan tool.
  3. If the vehicle passes the Circuit/System Verification, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
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