Fuel Pressure Sensor Supply Voltage
The fuel pressure sensor supply voltage is outside the expected range.
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What it means (plain English)
The fuel pressure sensor isn't getting the right voltage from the engine control module, which means it can't measure fuel pressure correctly.
What the computer is actually seeing
The engine control module expects a voltage between 0.5 and 4.5 volts from the fuel pressure sensor but sees something outside that range—either too low or too high.
What a healthy reading looks like
Expected supply voltage for the fuel pressure sensor is typically around 5 volts. Output should vary based on pressure, usually 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. Inspect the wiring and connectors for the fuel pressure sensor; look for frays or loose connections.
- 22. Check the fuel pressure sensor voltage with a multimeter; ensure it's receiving around 5 volts.
- 33. If voltage is good but output signal is wrong, replace the fuel pressure sensor and retest.
- 44. If there's no voltage reaching the sensor, inspect the wiring back to the ECM for breaks or shorts.
- 55. If you find wiring issues, repair them and recheck; if issues persist, consider testing the ECM.
Common causes
- Faulty fuel pressure sensor
- Broken wiring or poor connections
- Faulty engine control module (ECM)
- Corroded terminals
- Failed fuel pump causing erratic pressure
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; improper fuel pressure can affect performance and emissions.
Will this code come back after fixing?
If the issue is properly diagnosed and repaired—wiring, sensor, or ECM—this code shouldn't come back.
What other codes should I look for?
Look for related fuel system codes like SPN 0392 or SPN 0395 which can provide additional context.
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