P0090: Fuel pressure regulator control circuit fault
The ECU detects an electrical fault in the circuit that drives the fuel pressure regulator. Usually the wiring, the connector or the part itself.
| Code | P0090 |
|---|---|
| System | Engine and transmission |
| Group | P00xx, Air, fuel and emissions |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0090 means
The ECU operates the fuel pressure regulator with an electrical signal. This code means it has spotted something wrong in that circuit, such as an open circuit or abnormal resistance. It is an electrical problem rather than a pressure problem, although it ends up affecting pressure.
Most common causes
- Loose, corroded or damp regulator connector
- Regulator wire broken, chafed or rubbing on the engine
- Faulty coil inside the regulator
- Blown fuse or poor power supply to the circuit
- Rarely, an ECU fault
Symptoms
- Engine warning light on
- Loss of power or limp mode
- Hard starting or stalling
- Rough idle
Can you drive with P0090?
With care You can drive gently, but without reliable pressure control the engine may lose power or stall. Get it to a garage soon.
Open the bonnetthe in-depth explanation
How to check it
With the engine cold and off, check the regulator connector is fully home and free of green corrosion. Then clear the code and see if it returns straight away: an instant return means a permanent fault, which is easier to trace.
How to read and clear P0090 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0090 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P008C The fuel cooler pump control has a broken or disconnected wire
- P008D The fuel cooler pump control gives a lower signal than normal
- P008E The fuel cooler pump control gives a higher signal than normal
- P008F The engine coolant and fuel temperatures do not agree
- P0091 Fuel pressure regulator control circuit low
- P0092 Fuel pressure regulator control circuit high
- P0093 Large leak detected in the fuel system
- P0094 A small leak has been detected in the fuel system
- P0010 Camshaft A actuator control: open circuit (bank 1)
- P0011 Camshaft A timing over-advanced (bank 1)
- P0012 Camshaft A timing over-retarded (bank 1)
- P0013 Camshaft B actuator control: open circuit (bank 1)
What does code P0090 mean?
The ECU operates the fuel pressure regulator with an electrical signal. This code means it has spotted something wrong in that circuit, such as an open circuit or abnormal resistance. It is an electrical problem rather than a pressure problem, although it ends up affecting pressure.
Can you drive with P0090?
You can drive gently, but without reliable pressure control the engine may lose power or stall. Get it to a garage soon.
How do you clear P0090?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0090 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
