Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is reporting a low voltage condition.
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What it means (plain English)
The fuel pressure sensor is supposed to send a voltage signal representing the fuel pressure in the rail. If it sends a voltage below 0.1 volts, the system thinks there's no fuel pressure, leading to potential engine performance issues.
What the computer is actually seeing
The engine control module (ECM) expects the fuel pressure sensor to output a voltage between 0.5 to 4.5 volts based on fuel pressure. If the reading is below 0.1 volts, it'll trigger this code.
What a healthy reading looks like
Fuel pressure should show between 200 to 600 kPa (around 29 to 87 psi) depending on the engine type, with corresponding sensor voltage between 0.5 to 4.5 volts.
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.
- 11. Check the fuel pressure using a gauge to confirm that pressure is within expected values (200-600 kPa).
- 22. Inspect the wiring and connectors to the fuel pressure sensor for damage or corrosion. Repair as needed.
- 33. Measure the sensor's output voltage with a multimeter while the engine is running; voltage must be between 0.5V to 4.5V.
- 44. If voltage is low, replace the fuel pressure sensor and retest the voltage.
- 55. If voltage is normal, check the ECM input signals; potentially inspect for faults in the ECM.
Common causes
- Faulty fuel pressure sensor
- Wiring issue in the sensor circuit
- Poor connection at the sensor or ECM
- Insufficient fuel supply (blocked fuel filter)
- ECM malfunction
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Can I still drive the vehicle?
Yes, but performance may be affected, and you could experience hard starting or stalling.
Will this code come back after resetting?
Yes, if the underlying issue isn’t fixed, the code will reappear.
Why does this code sometimes show up with other codes?
It often appears with codes related to fuel system issues, as problems in one part can affect others.
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