Fuel Pressure Sensor Circuit Low
Indicates low voltage in the fuel pressure sensor circuit.
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What it means (plain English)
The fuel pressure sensor is telling the engine computer that the pressure is lower than it should be, typically less than 5 volts when it should be around 0.5 to 4.5 volts under normal operation.
What the computer is actually seeing
The computer monitors the fuel pressure sensor signal voltage, expecting it to fluctuate between 0.5 to 4.5 volts based on the actual fuel pressure in the system.
What a healthy reading looks like
0.5 to 4.5 volts from the fuel pressure sensor under normal operating conditions.
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 fuel pressure with a gauge; should be within manufacturer's specified range. If out of range, troubleshoot fuel delivery system.
- 2Inspect the wiring and connectors to the fuel pressure sensor for damage or corrosion; repair as needed.
- 3Using a multimeter, check the voltage at the fuel pressure sensor: it should be between 0.5 to 4.5 volts. If low, check wiring integrity from the ECM to the sensor.
- 4If all wiring and the sensor check out, use a scan tool to check for additional codes or freeze frame data to identify conditions when the code was triggered.
Common causes
- Faulty fuel pressure sensor
- Damaged wiring to the fuel pressure sensor
- Bad connector at the fuel pressure sensor
- Insufficient fuel supply (clogged filter, low pump output)
- Faulty engine control module (ECM)
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
It is safe to drive but keep in mind that engine performance may be affected and fuel efficiency could decrease.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code is likely to return after a short drive cycle.
Why does this code sometimes pair with SPN 1569?
Both codes relate to fuel pressure; a fault in one can affect readings in the other.
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