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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0638 To DTC P2635 >> DTC P1255 or P064A >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT: Verify that DTC P0231, P0232 or P023F are not set as current or history before performing this diagnostic. If any of those codes are set as current or history, go to DTC P0231, P0232, or P023F .
  1. Check 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 as current.
    • If DTC P1255 or P064A reset as current, replace the FPCM.
  2. If the DTCs do not set in the FPCM again, the system is okay. Do not replace the FPCM.
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