Fuel Pressure Sensor Circuit Low
Fuel pressure sensor signal is below expected range.
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What it means (plain English)
The fuel pressure sensor is checking how much fuel pressure is in the system. It's supposed to see a pressure of between 5 to 55 psi, but right now, it's seeing numbers lower than that.
What the computer is actually seeing
The engine control module sees a voltage from the fuel pressure sensor that drops below 0.5 volts, indicating a low pressure condition when it should be higher.
What a healthy reading looks like
Fuel pressure should be between 5 to 55 psi under normal operating conditions; voltage from the sensor should be between 0.5 to 4.5 volts.
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 level in the tank; should be above 1/4 tank. Decision point: If low, fill the tank and retest.
- 2Inspect wiring and connector for damage or corrosion at the fuel pressure sensor. Decision point: If damaged, repair or replace the wiring/connector.
- 3Test the fuel pressure with a gauge; should be 5 to 55 psi. Decision point: If pressure is low, check for fuel pump operation.
- 4Measure voltage at the fuel pressure sensor while the engine is running. Decision point: Should be 0.5 to 4.5 volts. If not, replace the sensor.
Common causes
- Faulty fuel pressure sensor
- Wiring issue or damaged connector
- Fuel filter restriction
- Fuel pump failure
- Low fuel level or contamination
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advised to fix this soon as low fuel pressure can lead to engine misfiring or stalling.
Will this code come back after repair?
If the underlying issue is fixed properly, the code shouldn't return.
Why does this code pair with engine misfires?
Low fuel pressure can cause insufficient fuel delivery, leading to misfires.
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