Fuel Pressure Sensor Circuit High
The fuel pressure sensor is reporting a voltage that's too high.
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What it means (plain English)
Inside the fuel system, the fuel pressure sensor measures the pressure of the fuel. When it detects a voltage above the normal range (like over 5 volts), it triggers this code, indicating a potential issue in the sensor circuit or a problem with fuel pressure.
What the computer is actually seeing
The engine control module (ECM) sees a voltage signal from the fuel pressure sensor that exceeds 5 volts, which is outside the expected operating parameters for the sensor.
What a healthy reading looks like
The fuel pressure should typically be around 50-60 psi at the rail, with the sensor output voltage ranging from 0.5 to 4.5 volts corresponding to that pressure.
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 fuel pressure at the rail. It should be between 50-60 psi. If it’s low, address that issue first.
- 22. Inspect the wiring and connectors to the fuel pressure sensor for damage, corrosion, or loose connections.
- 33. Measure the voltage at the sensor connector with the ignition on (engine off). It should be between 0.5 to 4.5 volts. If it's above 5 volts, there's likely a short.
- 44. If voltage is normal but you still have the code, replace the fuel pressure sensor and retest.
- 55. If the code persists after sensor replacement, suspect a possible ECM issue.
Common causes
- Faulty fuel pressure sensor
- Damaged wiring or connector issues
- Short circuit in the sensor circuit
- Low fuel levels causing incorrect readings
- Failed engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not recommended to drive as low fuel pressure can cause performance issues.
Will the code come back after fixing?
If you address the underlying issue, it shouldn’t return.
Why does this code pair with low fuel pressure?
The fuel pressure sensor provides feedback on fuel pressure; if fuel pressure is low, it can affect the sensor readings.
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