Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is reporting a low signal.
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What it means (plain English)
The fuel pressure sensor measures the fuel pressure inside the rail, but it's sending a signal that's too low, indicating potential issues with fuel supply or sensor failure.
What the computer is actually seeing
The engine control unit (ECU) expects a fuel pressure reading within a range of approximately 200-900 kPa (29-130 psi) depending on the engine load and RPM. Low values trigger this code.
What a healthy reading looks like
Expect fuel rail pressure to be between 200-900 kPa (29-130 psi).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the fuel level in the tank; ensure it's above 1/4 full to prevent starvation.
- 2Inspect wiring and connectors at the fuel pressure sensor for damage, corrosion, or loose connections.
- 3Measure the output voltage from the fuel pressure sensor; it should typically be around 0.5V to 4.5V, depending on actual fuel pressure.
- 4If the voltage is low, check for a faulty sensor by replacing it temporarily and rechecking the system.
- 5If the new sensor gives a normal reading, replace the old one; if not, continue diagnosing fuel system components.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or damaged connector
- Low fuel level or fuel pump failure
- Clogged fuel filter or lines
- Air in the fuel system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should fix it soon, but it may be driveable with reduced performance.
Will this come back after reset?
Yes, if the underlying issue isn't fixed, the code will return.
Why does this code appear with low fuel pressure?
It indicates that the fuel delivery system isn't meeting the required pressure, which can affect engine performance and efficiency.
Working a real vehicle right now?
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