Fuel Pressure Sensor Circuit Low
Fuel pressure sensor signal is lower than expected.
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What it means (plain English)
The fuel pressure sensor is sending a signal that indicates the fuel pressure is too low or the signal is shorted to ground, which makes the engine think there isn't enough fuel being supplied.
What the computer is actually seeing
The Engine Control Module (ECM) sees a voltage from the fuel pressure sensor below a predetermined threshold, typically around 0.5 volts when it should be closer to 1.5-5.0 volts at normal operating pressure.
What a healthy reading looks like
Normal fuel pressure is usually around 30-60 PSI (206-414 kPa) depending on the engine type and fuel system design.
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 fuel level in the tank; ensure it is above 1/4 tank.
- 2Inspect wiring and connectors for the fuel pressure sensor for any visible damage or corrosion.
- 3Test the fuel pressure using a reliable gauge; it should be within the expected values (30-60 PSI). If it is low, suspect fuel pump or filter issues.
- 4Measure the voltage output from the fuel pressure sensor with a multimeter; it should be between 1.5-5.0 volts regarding the fuel pressure. If below 0.5 volts, replace the sensor and clear the code.
- 5If replacing the sensor does not resolve the issue, check for a PCM ground and power supply issues.
Common causes
- Faulty fuel pressure sensor
- Wiring issues or damaged connectors
- Low fuel level or clogged fuel filter
- Fuel pump failure
- ECM has a software issue
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon; if fuel pressure is critically low, it could lead to engine stalling.
Will this fault code come back after repairs?
If the root cause is fixed properly, the code shouldn't return.
Why do I see this code with other fuel system codes?
This code often pairs with others indicating fuel system malfunctions; they can be interconnected.
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