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  • P0088 Fuel Rail Pressure Signal Is Above Maximum Limit

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    P0088 FUEL RAIL PRESSURE SIGNAL IS ABOVE MAX LIMIT

    When Monitored and Set Condition:

    When Monitored: Engine running.
    Set Condition: Fuel pressure is above a calibrated value for a calibrated amount of time.

    POSSIBLE CAUSES

    • FUEL CONTROL ACTUATOR (FCA)
    • FUEL PRESSURE SENSOR
    • INTERMITTENT CONDITION

    DIAGNOSTIC PROCEDURE

    NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
    NOTE: This DTC will only clear by turning the ignition off. It is necessary to operate the engine for at least five seconds to verify the DTC will clear.

    1. Check for a mechanically stuck Fuel Control Actuator by turning the key switch on and off and listening for a click at the FCA. Do you hear a click from the actuator when the key is cycled off?
      Yes --> Go To 2
      No --> Check the electrical connector of the Fuel Control Actuator, if the connection is tight, replace the fuel control actuator. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
    2. Using the DRBIII®, monitor the fuel pressure while operating the engine at several different RPM settings. Did the fuel pressure reading on the DRBIII® change?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).
      No --> Replace the Fuel Pressure Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL).

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