Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is detecting a voltage lower than expected.
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What it means (plain English)
The fuel pressure sensor measures the pressure of the fuel in the system. If its output is too low, the engine control module (ECM) thinks the fuel pressure is below the level needed for efficient combustion.
What the computer is actually seeing
The ECM is getting a voltage signal from the fuel pressure sensor that is below 0.2 volts, indicating low fuel pressure.
What a healthy reading looks like
A typical fuel pressure signal should be between 0.5 to 4.5 volts for normal operating pressures (usually around 25-60 psi depending on the vehicle).
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 level in the tank. Is it low? If so, fill the tank and retest.
- 22. Inspect the wiring and connector at the fuel pressure sensor. Are there any frays, shorts, or disconnects? If yes, repair as needed and retest.
- 33. Measure the voltage at the fuel pressure sensor while the engine is running. Is the voltage below 0.5 volts? If yes, proceed to the next step.
- 44. Disconnect the fuel pressure sensor and measure resistance through the sensor. Does it fall within manufacturer specs? If not, replace the sensor.
- 55. If the sensor is good, check the fuel pump operation. Is the pump providing adequate pressure? If not, replace the pump.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or shorts in sensor circuit
- Low fuel level or fuel starvation
- Faulty fuel pump
- Clogged fuel filter
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
It's not recommended to drive as low fuel pressure can lead to poor engine performance or stalling.
Will this code come back after I fix it?
If the cause is properly addressed, the code should not return.
Why did this code appear with another code?
It’s common for fuel pressure issues to trigger multiple related codes, especially those associated with fuel delivery or combustion problems.
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