P00FE

Fuel Pressure Regulator 1 Control Circuit Open

P00FE is a generic OBD-II powertrain diagnostic trouble code: Fuel Pressure Regulator 1 Control Circuit Open. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P00FE
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P00FE means

P00FE is stored when the PCM/ECM detects an open circuit condition in the control circuit for fuel pressure regulator 1. An open circuit means the solenoid is not receiving a complete electrical path from the ECM, preventing any duty-cycle control of the regulator. This is typically caused by a broken wire, a disconnected or poorly seated connector, or an internally open solenoid winding.

With an open control circuit the regulator defaults to its mechanical rest position. Depending on whether the regulator is normally open or normally closed, this may result in maximum or minimum rail pressure being held regardless of engine operating conditions. Either extreme disrupts injection accuracy and can trigger companion codes for fuel pressure deviation, fuel trims, or misfires.

Diagnosis should prioritize connector and harness inspection before any component replacement, as open circuits are frequently caused by connector corrosion, spread pins, or chafed wires. Solenoid resistance should be checked across its terminals; a reading of infinite resistance confirms an internal open and requires regulator replacement.

Common causes

Most-frequently reported root causes when P00FE is logged.

  • 1
    Broken or severed wire in the regulator control circuit harness.
  • 2
    Disconnected, poorly seated, or damaged regulator solenoid connector.
  • 3
    Internally open solenoid winding due to thermal damage or manufacturing defect.
  • 4
    Corroded connector pins creating a high-resistance or no-continuity condition.
  • 5
    ECM connector pin that has backed out of its housing.
  • 6
    Prior repair splice failure or use of incorrect wire gauge causing an open.
  • 7
    Chafed harness where the conductor has broken but the insulation appears intact.

Symptoms drivers notice

MIL illuminated.
Fuel rail pressure fixed at a non-commanded level.
Engine running excessively rich or lean depending on regulator default position.
Misfires or rough idle from uncontrolled fuel delivery.
Hard starting if rail pressure defaults to an extreme value.

How to diagnose P00FE

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and freeze frame data; note any co-stored pressure or trim codes.
  2. 2
    Perform a thorough visual inspection of the regulator connector, wiring, and routing for obvious damage.
  3. 3
    Measure resistance across the regulator solenoid terminals and compare to specification; infinite resistance indicates an internal open.
  4. 4
    With the solenoid disconnected, use a continuity tester to verify the control wire is intact from the connector to the ECM pin.
  5. 5
    Check the ECM connector at the regulator driver pins for corrosion or spread contacts.
  6. 6
    Repair any wiring faults found and retest the circuit before replacing the regulator.
  7. 7
    Replace the fuel pressure regulator if solenoid winding resistance is confirmed open.

Related powertrain codes

Frequently asked questions

Can an open circuit cause the engine to still run?

Yes. The engine will run on whatever pressure the regulator defaults to mechanically, but performance and emissions will be degraded.

How is an open different from a short?

An open circuit has a break preventing current flow. A short circuit is an unintended connection to ground (low) or power (high). P00FE specifically indicates a break in the circuit.

Will wiggling the connector sometimes make the code go away?

If the fault is intermittent due to a loose connector, manipulating it may temporarily restore the circuit. However, the underlying connection problem must be repaired permanently.

Is it worth replacing the connector pigtail rather than the entire regulator?

If the solenoid winding tests within specification and only the connector or wiring is damaged, repairing the harness is the correct and more cost-effective approach.

Disabling P00FE in software

RaceTune can permanently disable P00FE — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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