Fuel Pressure Sensor Circuit Low
The fuel pressure sensor is reporting a voltage lower than expected.
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What it means (plain English)
When you see SPN 3273, the fuel pressure sensor is detecting a low voltage, typically below 0.5 volts, indicating the sensor may be malfunctioning or there's a wiring issue.
What the computer is actually seeing
The engine control unit (ECU) expects the fuel pressure sensor to send back a voltage signal between 0.5 to 4.5 volts under normal operation. When it's lower than 0.5 volts, it triggers this fault code.
What a healthy reading looks like
0.5 to 4.5 volts from the fuel pressure sensor, especially when the engine is running and not in limp mode.
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 wiring and connectors to the fuel pressure sensor for damage or corrosion.
- 2Measure the voltage at the fuel pressure sensor connector while the engine is running. Is it below 0.5 volts?
- 3If the voltage is low, check for any open circuits or short to ground in the wiring harness.
- 4If wiring is good, replace the fuel pressure sensor and retest the voltage.
- 5If the new sensor shows low voltage, further check the fuel pump operation and fuel pressure regulator.
Common causes
- Faulty fuel pressure sensor
- Damaged wiring or connectors
- Low fuel pressure due to fuel pump failure
- Fuel pressure regulator issues
- ECU malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive, as low fuel pressure can lead to stalling or no-start conditions.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code pair with SPN 3274?
SPN 3274 indicates high fuel pressure, which can occur if there's a wiring problem affecting multiple sensors.
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