Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is sending a low voltage signal to the engine control module.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel pressure sensor measures how much fuel pressure is in the system, and a low signal means the sensor thinks there's less pressure than there should be, which can lead to engine performance issues.
What the computer is actually seeing
The engine control module (ECM) receives a voltage reading from the fuel pressure sensor that is consistently below the expected range, usually less than 0.5 volts when it should be around 1-5 volts depending on the system.
What a healthy reading looks like
Normal fuel pressure sensor voltage is typically between 1 and 5 volts; expect at least 1 volt at idle with fuel pressure at around 30-60 psi depending on the engine model.
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 condition of the fuel level and ensure it's adequate; it should be above 1/4 tank to prevent pressure issues. Decision point: Is the fuel level low? If yes, fill the tank and retest.
- 2Inspect the wiring and connectors to the fuel pressure sensor for damage or corrosion. Decision point: Are there any visible issues? If yes, repair or replace the damaged wiring/connectors and retest.
- 3Using a multimeter, check the voltage output of the fuel pressure sensor with the key in the ON position (engine off). Expect 1-5 volts. Decision point: Is the voltage within range? If no, replace the fuel pressure sensor and retest.
- 4If voltage is normal, connect a fuel pressure gauge to the fuel rail. Start the engine and check fuel pressure; it should match specifications. Decision point: Is the fuel pressure within specs? If no, check the fuel pump and filter for issues.
Common causes
- Faulty fuel pressure sensor
- Damaged wiring or connectors to the sensor
- Insufficient fuel level in the tank
- Fuel pump issues
- Blocked fuel filter
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code as it can lead to engine performance issues and potential stalling.
Will the code return after repairs?
If the underlying issue is correctly fixed, the code should not return once the vehicle is cleared and retested.
Why does this code pair with other SPN codes?
Codes can pair due to shared circuitry or related sensor failures; investigating one may lead to discovering issues with others.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →