Fuel Pressure Sensor/Transducer Circuit Low
Fuel pressure sensor circuit is reading too low.
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What it means (plain English)
The fuel pressure sensor is detecting that the fuel pressure in the system is lower than it should be, which can cause performance issues.
What the computer is actually seeing
The fuel pressure sensor sends a voltage signal to the ECM that indicates the fuel pressure. A low reading would typically be below 5 volts for a 0-5V sensor output.
What a healthy reading looks like
Normal fuel pressure for many systems is usually between 40-60 PSI during operation. The voltage from the sensor should be around 0.5V to 4.5V depending on the pressure.
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 for any visible wiring and connector damage in the fuel pressure sensor circuit.
- 22. Verify fuel level in the tank is adequate, at least 1/4 tank or more.
- 33. Use a multimeter to check the signal voltage at the fuel pressure sensor — it should be between 0.5 and 4.5 volts.
- 44. If the signal is low, check for wiring continuity and ground — ensure you have 0 volts on the ground pin with the sensor connected.
- 55. If voltage readings are correct, check the fuel pressure with a gauge; it should be between 40-60 PSI under normal operation. If low, investigate fuel pump and filter.
Common causes
- Faulty fuel pressure sensor
- Wiring or connector issues
- Fuel delivery problems (low fuel level, clogged fuel filter)
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive it short distances but should fix it soon to avoid performance issues.
Will this code come back after clearing it?
If the underlying issue isn't resolved (like a bad sensor or fuel delivery issue), it will likely return.
Why does this code sometimes pair with SPN 1347?
SPN 1347 is often a related signal issue that indicates inconsistent readings from the fuel pressure sensor, which can contribute to the low signal issue.
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