Gaseous Fuel Pressure Sensor Circuit Low
Low signal detected from the gaseous fuel pressure sensor.
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What it means (plain English)
The computer is reading a lower-than-expected voltage from the fuel pressure sensor, indicating low fuel pressure in the system, usually measured in volts or milliamps.
What the computer is actually seeing
The engine control module (ECM) monitors the gaseous fuel pressure sensor output, which should be around 0.5 to 4.5 volts at standard operating pressure. When it reads below 0.2 volts, it triggers this code.
What a healthy reading looks like
Gaseous fuel pressure should be between 1.5 to 5 psi under normal operation; sensor voltage should be between 0.5 to 4.5 volts when functioning properly.
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 gaseous fuel level. Ensure it's sufficient and the fuel system is full. Decision: If low, add fuel and retest. Proceed if normal.
- 22. Visually inspect the wiring and connectors to the gaseous fuel pressure sensor. Look for damage, corrosion, or loose connections. Decision: If found, repair/replace as necessary and retest. Proceed if good.
- 33. Use a multimeter to check the output voltage at the gaseous fuel pressure sensor. It should read between 0.5 and 4.5 volts. Decision: If out of range, suspect a faulty sensor and replace. Proceed if within range but still has code.
- 44. If the sensor voltage is good, check for continuity and shorts in the wiring from the sensor to the ECM. Decision: If issues are found, repair as needed. If clean, suspect ECM failure.
Common causes
- Faulty gaseous fuel pressure sensor
- Wiring issues (shorts, opens, grounds)
- Bad connections at the sensor or connector
- Fuel system restrictions or leaks
- Open circuit in the sensor circuit
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe but fix it soon since it affects fuel pressure and can affect performance.
Will the code come back after clearing?
It might return if the underlying issue isn't resolved.
Why does this code appear with low power?
Low power could be due to inadequate fuel pressure affecting engine performance, detected through this code.
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