Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is reporting a voltage lower than expected.
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 is in the system. If it reports too low a voltage (usually below 0.5V), the engine control unit thinks there's a problem, affecting fuel delivery.
What the computer is actually seeing
The computer sees a voltage from the fuel pressure sensor falling below the threshold that indicates normal operation. Expected voltage should be around 0.5V to 4.5V depending on fuel pressure.
What a healthy reading looks like
Normal expected output voltage from the sensor is between 0.5V and 4.5V corresponding to a fuel pressure of 5-60 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.
- 11. Check the vehicle's fuel level to ensure it's not low. Replace fuel if necessary.
- 22. Inspect the wiring and connectors for the fuel pressure sensor for signs of damage or corrosion. Repair or replace as needed.
- 33. Use a multimeter to measure the voltage at the fuel pressure sensor connector; it should be between 0.5V and 4.5V. If it's below 0.5V, continue troubleshooting.
- 44. If voltage is correct, replace the fuel pressure sensor. If voltage is still low, check for issues in the ECU or fuel supply system.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or shorts
- Connector problems
- Low fuel level or fuel pump failure
- ECU malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive the vehicle, but expect possible drivability issues or poor fuel economy. Fix soon.
Will this code come back after resetting?
If underlying issues aren’t resolved, yes, the code will likely reappear.
Why does this code pair with SPN 5582?
SPN 5582 typically indicates a high voltage scenario, meaning problems in the circuit can lead to both low and high voltage codes.
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 →