Damaged, chafed or corroded wiring in the regulator control circuit, such as a short to voltage; Loose, corroded or damaged connector at the fuel pressure regulator or control valve; Faulty fuel pressure regulator or pressure control valve with an internal electrical fault; Fuel pump or fuel rail pressure control component fault, depending on the engine's fuel system design; Poor power or earth supply or a blown fuse in the regulator circuit; Faulty engine control unit driver circuit; Outdated or faulty ECU software where the manufacturer has identified it as a known cause.

P0092

Fuel Pressure Regulator A Control Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
92: FaultThe specific fault in that area

What it means

P0092 means the engine control unit has detected a high electrical signal in the control circuit of fuel pressure regulator 'A'. The ECU commands the regulator, and when the voltage or current it measures in that circuit is higher than expected, it sets the code. This points to an electrical fault in the circuit, such as a short to voltage, or to a fault inside the regulator or the ECU driver, rather than simply a fuel pressure problem.

Symptoms

Engine warning light on
Long cranking or hard starting
Engine running rough, hesitating or stumbling under load
Loss of power or the car going into limp mode
Stalling or intermittent cutting out
Poor fuel economy

Possible causes

Damaged, chafed or corroded wiring in the regulator control circuit, such as a short to voltagelikely
Loose, corroded or damaged connector at the fuel pressure regulator or control valvelikely
Faulty fuel pressure regulator or pressure control valve with an internal electrical faultlikely
Fuel pump or fuel rail pressure control component fault, depending on the engine's fuel system designpossible
Poor power or earth supply or a blown fuse in the regulator circuitpossible
Faulty engine control unit driver circuitrare
Outdated or faulty ECU software where the manufacturer has identified it as a known causerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, checking for related fuel pressure or rail pressure codes.
Check for any manufacturer technical bulletins or known issues for the specific model and engine.
Visually inspect the regulator, its connector and the wiring harness for chafing, heat damage, corrosion, water ingress or pushed-out pins.
Check the relevant fuses and relays, and the power and earth supplies to the regulator circuit against the wiring diagram.
Measure the regulator's coil or solenoid resistance and compare it with the specification for that engine.
With the ignition on, check the control circuit for a short to voltage and for wiring continuity between the regulator and the ECU.
Using a scan tool, monitor the commanded and actual fuel pressure, and check whether the regulator responds to an actuator test where supported.
If the wiring and regulator test fine, check the ECU driver and software status before considering the ECU itself.

How to fix

Repair or replace damaged wiring and fix any short to voltage in the control circuit.
Clean, repair or replace the corroded or damaged connector terminals.
Replace the faulty fuel pressure regulator or pressure control valve.
Replace blown fuses and restore proper power and earth supply to the circuit.
Repair or replace the fuel pump or rail pressure component if testing shows it is at fault.
Update the ECU software only if the manufacturer lists it as a fix, and replace the ECU only after all other faults have been ruled out.

Can I keep driving?

Medium severity

The car may drive, but fuel pressure control could be unreliable, leading to stalling, loss of power or limp mode. Get it checked soon and avoid long journeys or overtaking until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.