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Home >> Cadillac >> 2009 >> CTS V, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L - DTC P0641 To DTC P2635 >> DTC P1255 or P064A >> Circuit/System Testing

Circuit/System Testing

  1. Verify that DTC P0231, P0232 or P023F are not set.
  2. Ensure that the entire undercarriage of the vehicle is clean, especially around the spare tire area where the FPCM is located. Clear all codes from the FPCM and test drive the vehicle. Verify that DTC P1255 or P064A do not set.
    • If DTC P1255 or P064A reset, replace the FPCM.
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