Faulty bank 2 fuel rail pressure sensor giving a low or flat signal; Signal wire shorted to ground or chafed against the body or engine; Corroded, loose or damaged connector terminals at the sensor or ECU; Open circuit or high resistance in the 5 volt reference or sensor ground wire; Actual fuel pressure very low in the bank 2 rail, for example from a failing pump or regulator, causing a low reading that is flagged as a circuit fault (depends on engine and system design); Fault inside the engine control unit.

P01C0

Fuel Rail Pressure Sensor Circuit Low Bank 2.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
1: AreaFuel and air metering
C0: FaultThe specific fault in that area

What it means

P01C0 means the engine control unit has detected the signal from the bank 2 fuel rail pressure sensor sitting lower than its valid voltage range. The ECU monitors this signal against its expected range and sets the code when the voltage stays too low, which points to an electrical fault such as a short to ground, an open circuit or a failed sensor. Without a reliable pressure reading the ECU may limit engine output or run a fallback strategy.

Symptoms

Engine warning light on
Reduced power or limp mode
Hard starting or long cranking
Rough idle or misfire
Hesitation under acceleration
Engine stalling in some cases

Possible causes

Faulty bank 2 fuel rail pressure sensor giving a low or flat signallikely
Signal wire shorted to ground or chafed against the body or enginelikely
Corroded, loose or damaged connector terminals at the sensor or ECUlikely
Open circuit or high resistance in the 5 volt reference or sensor ground wirepossible
Actual fuel pressure very low in the bank 2 rail, for example from a failing pump or regulator, causing a low reading that is flagged as a circuit fault (depends on engine and system design)possible
Fault inside the engine control unitrare

How to diagnose

Read all stored and pending codes and note freeze frame data such as engine speed, load and rail pressure at the time of the fault.
Look for other codes, especially other sensor reference voltage or fuel pressure codes, which would suggest a shared supply or ground fault.
Visually inspect the sensor, connector and harness for damage, chafing, corrosion, water ingress or signs of previous repair.
With the ignition on and engine off, check live data for the bank 2 rail pressure reading and compare it with the bank 1 sensor if fitted; the readings should be sensible and similar.
Wiggle the harness and connector while watching live data for the signal dropping out or jumping.
Using the wiring diagram for the specific model, test the sensor for correct 5 volt reference, a good ground and a signal voltage within specification.
Check the signal wire for a short to ground and for continuity back to the ECU with the connector disconnected.
If the electrical checks pass, verify actual fuel pressure using the manufacturer's procedure for that engine, as the method differs between petrol direct injection and other systems.

How to fix

Replace the bank 2 fuel rail pressure sensor if its signal or supply readings are out of specification.
Repair or replace any damaged, shorted or open wiring in the sensor circuit.
Clean or renew corroded or loose connector terminals and ensure the connector locks properly.
Restore the 5 volt reference or ground supply if a fault is found in the shared circuit.
Repair any genuine low fuel pressure fault found, such as a worn pump or faulty regulator, following the manufacturer's procedure.
Clear the code after repair and road test to confirm it does not return.

Can I keep driving?

Medium severity

The car may be driveable in limp mode, but it is best to have it fixed soon as power may be limited and it could stall or become hard to start. Avoid long journeys or heavy loads until it is repaired.

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