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DTC P0231, P0232, or P023FDiagnostic Instructions
DTC DescriptorsDTC P0231: Fuel Pump Control Circuit Low VoltageDTC P0232: Fuel Pump Control Circuit High Voltage DTC P023F: Fuel Pump Control Circuit Diagnostic Fault Information
Circuit/System DescriptionThe engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the fuel pump control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure. Conditions for Running the DTCP0231, P023FThe ignition voltage is between 9-18 V. P0232The control enable voltage signal supplied for the ECM to fuel pump control module is inactive for 4 seconds after engine has been shut off. Conditions for Setting the DTCThe fuel pump control module detects a fault on the fuel pump voltage circuit that is less than 4 V or greater than 4.5 V. Action Taken When the DTC SetsDTCs P0231, P0232, and P023F are Type A DTCs. Conditions for Clearing the DTCDTCs P0231, P0232, and P023F are Type A DTCs. Diagnostic AidsUsing 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. On vehicles equipped with a high pressure mechanical pump on Direct Fuel Injection engines, the vehicle may continue to run even though the pump in the fuel tank is not operating. Reference InformationSchematic ReferenceConnector End View ReferenceDescription and OperationElectrical Information ReferenceDTC Type ReferencePowertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool ReferenceControl Module References for scan tool information Circuit/System VerificationIgnition ON, command the fuel pump ON and OFF using the scan tool ECM fuel pump output control. The fuel pump should turn ON and OFF. Circuit/System Testing
Repair InstructionsPerform the Diagnostic Repair Verification after completing the repair.
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