• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

The engine control module (ECM) supplies voltage to the fuel pump driver control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump driver control module remains active for 2 s, unless the engine is in crank or run. While this voltage is being received, the fuel pump driver control module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel pressure.

• The ignition voltage is between 9–32 V.
• The engine is cranking or running.
• The fuel pump enable circuit is commanded ON.
• The DTC runs continuously when the conditions above are met.

The fuel pump driver control module detects a driver temperature greater than or equal to 320°F (160°C) for less than 0.2 s.

DTC P1255 is a Type B DTC.

DTC P1255 is a Type B DTC.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Engine Controls Schematics

Component Connector End Views

Fuel System Description

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References for scan tool information

1. Vehicle in Service Mode.
2. Verify DTC P0231, P0232, or P023F is not set.
• If any of the DTCs are set

  Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of the DTCs are set
3. Verify that the area where the K111 Fuel Pump Driver Control Module is located is free of debris, clutter, or any insulating material that would cause the fuel pump driver control module to overheat.
• If any debris, clutter, or other material is found
1. Clear the area where the K111 Fuel Pump Driver Control Module is located.
2. Clear the DTC and test drive the vehicle.
3. Verify the DTC does not set.
• If the DTC sets, replace the K111 Fuel Pump Driver Control Module.
• If the DTC is not set
4. All OK.
• If no debris, clutter, or other material is found
4. Clear the DTC and test drive the vehicle.
5. Verify the DTC does not set.
• If the DTC sets

  Replace the K111 Fuel Pump Driver Control Module.

• If the DTC does not set.
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Fuel Pump Power Control Module Replacement