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Home >> Buick >> 2009 >> Lucerne Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0340 To DTC P2544 >> DTC P0401 >> Circuit/System Verification

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. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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