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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - DTC P1255 To DTC P3449 >> 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 area where the K27 fuel pump control module is located. Clear all codes from the K27 fuel pump control module and test drive the vehicle. Verify that DTC P1255 or P064A do not set.
    • If DTC P1255 or P064A reset, replace the K27 fuel pump control module.
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