Fuel Pressure Indicator circuit
Indicates an issue with fuel pressure sensor or circuit.
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What it means (plain English)
The fuel pressure sensor is either not working or the wiring has a problem, causing incorrect fuel pressure reading to the computer.
What the computer is actually seeing
The computer checks for correct voltage signals (0.5V to 4.5V) from the fuel pressure sensor. If the signal is too high or too low for a specific time (typically over 5 seconds), it triggers this code.
What a healthy reading looks like
Normal fuel pressure voltage should be between 0.5V and 4.5V; with the engine running, expected pressure is usually between 40 to 60 PSI depending on the engine.
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 sensor connector for loose wires or corrosion. If found, repair the connector.
- 22. Measure the voltage at the fuel pressure sensor with the engine running. Should be between 0.5V and 4.5V. If out of range, continue to next step.
- 33. Test the fuel pressure sensor with a multimeter to ensure it's outputting the correct voltage. If faulty, replace the sensor.
- 44. Inspect the wiring harness for shorts or opens; repair as necessary.
- 55. Clear the code and run the engine to see if the code returns.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or open circuit
- Bad ground connection
- Fuel contamination or blockage
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive with this code?
It's not recommended to drive as it could lead to a lack of fuel pressure, resulting in engine stalling.
Will this code come back?
If the underlying issue is not fixed, yes, the code will likely return.
Why does this pair with SPN 341?
SPN 341 indicates related faults in the fuel system, often showing up when SPN 340 is present.
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