Fuel System Pressure Sensor - Circuit Low Input
The fuel system pressure sensor is reporting a low voltage signal.
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What it means (plain English)
The fuel pressure sensor is sending a signal that's lower than normal, which suggests the fuel system isn't maintaining the right pressure for engine operation.
What the computer is actually seeing
The engine control module (ECM) sees the voltage from the fuel system pressure sensor drop below 0.5 volts when it should be between 0.5 and 4.5 volts during normal operation, indicating low fuel pressure.
What a healthy reading looks like
Fuel pressure should typically be between 35-60 PSI; sensor voltage should be around 0.5-4.5 volts under standard conditions.
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 fuel level in the tank; ensure it's at least 1/4 full.
- 2Inspect wiring harness to the fuel system pressure sensor for any visible damage or corrosion.
- 3Measure voltage at the fuel pressure sensor connector; it should be between 0.5 and 4.5 volts. If lower, inspect wiring further.
- 4With the key in the ON position (engine off), check the signal wire while a helper monitors the scanner; it should rise as fuel pressure builds up (crank the engine briefly).
- 5If the sensor voltage remains low while cranking, replace the fuel pressure sensor and retest.
Common causes
- Faulty fuel system pressure sensor
- Wiring issues (short to ground, damaged wires)
- Fuel pump failure or weakness
- Blocked fuel filter
- Low fuel levels
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's typically safe to drive short distances, but you might notice poor performance or stalling; fix soon.
Will this code come back after clearing it?
It might return if the underlying issue isn't resolved, like a bad sensor or fuel pump.
Why does this code sometimes appear with loss of power?
Low fuel pressure can cause inadequate fuel delivery, leading to performance issues and potential engine stalling.
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