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P codepowertrainMedium severity

P2295Fuel Pressure Regulator 2 Control Circuit Low

The control circuit voltage for fuel pressure regulator 2 is stuck lower than expected, usually from a short to ground or a shorted solenoid.

Definition

The PCM drives fuel pressure regulator 2 — typically the rail-mounted pressure control valve — with a duty-cycled signal and monitors the circuit voltage for plausibility. This code sets when the circuit reads low when it should not, indicating a short to ground in the harness, a shorted valve winding, or a failed driver. Because the PCM loses precise authority over rail pressure relief, symptoms can include rough running, power loss, pressure-control companion codes, and an illuminated MIL; some systems enter a reduced-power mode.

Common causes

  • Control wire chafed through and shorted to ground
  • Regulator solenoid windings shorted internally (low coil resistance)
  • Connector contamination creating a leakage path to ground
  • Harness pinched at a bracket, clamp, or after recent engine service
  • Failed low-side driver inside the PCM

Common misdiagnoses

  • Rail pressure control valve replaced when a chafed harness is grounding the circuit
  • High-pressure pump replaced for an electrical circuit code
  • PCM condemned before the harness is isolated and tested
  • Battery/charging system chased because the code mentions low voltage

Troubleshooting steps

  1. 1.Measure the solenoid coil resistance

    Compare the reading at the valve pins to spec; a value well below spec indicates shorted windings and a failed valve.

  2. 2.Isolate the harness and test for short to ground

    With the valve and PCM disconnected, check each circuit wire to chassis ground — any continuity confirms a harness short.

  3. 3.Inspect the harness routing

    Trace the loom for chafe points at brackets, edges, and areas disturbed by recent repairs, especially near the fuel rail and engine lift points.

  4. 4.Verify the PCM driver

    With wiring proven good, scope the control terminal for a proper switching waveform; a line held low with the circuit open implicates the PCM.

  5. 5.Confirm pressure control after repair

    Clear codes, then verify actual rail pressure follows commanded pressure at idle and under load with no return of the code.

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