Fuel Pressure Sensor Voltage Low
The fuel pressure sensor is reporting a low voltage condition.
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What it means (plain English)
This means the fuel pressure sensor is sending a signal that's below the expected voltage, which could suggest there's not enough fuel pressure in the system or the sensor itself is faulty.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the fuel pressure sensor between 0.5V (at low pressure) and 4.5V (at high pressure). If the voltage drops below 0.2V, the ECM triggers this error code.
What a healthy reading looks like
Normal operation voltage from fuel pressure sensor should be between 0.5V and 4.5V when engine is running.
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 wiring and connector at the fuel pressure sensor for damage or corrosion. Fix any issues found.
- 2With the key on, engine off, measure the voltage at the fuel pressure sensor connector. Expect a battery voltage (around 12V). If no voltage, trace back to the fuse and relay.
- 3Start the engine and monitor the fuel pressure sensor signal voltage. It should be between 0.5V and 4.5V. If it is below 0.2V, replace the fuel pressure sensor and recheck.
- 4If the sensor is reading correctly, measure fuel pressure at the rail with a gauge. Expect around 40-60 psi for most vehicles. If low, investigate the fuel pump and filter for blockages.
Common causes
- Faulty fuel pressure sensor
- Wiring issue (short or open circuit)
- Fuel system blockage
- Faulty fuel pump
- Bad ECM software
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate; you can drive but should fix it soon to avoid fuel delivery issues.
Will this issue come back after a reset?
If the underlying problem isn't fixed, yes, it will come back.
Why does this code pair with fuel system issues?
Because low fuel pressure affects engine performance, triggering this and related codes.
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