Fuel System Pressure Sensor Signal Received Invalid Data
The fuel system pressure sensor is sending out incorrect or invalid data to the engine control module.
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What it means (plain English)
The sensor that measures how much pressure is in the fuel system is not working right, giving strange readings that the computer doesn't understand.
What the computer is actually seeing
The engine control module (ECM) is receiving voltage signals from the fuel pressure sensor that are either out of range or not responding correctly, indicating possible sensor failure or wiring issues.
What a healthy reading looks like
The fuel pressure sensor should typically output between 0.5V (low pressure) to 4.5V (high pressure) depending on the fuel system's actual pressure, generally around 30-70 psi for normal operation.
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 the fuel pressure sensor's connector for damage or corrosion. Repair any issues found.
- 22. Measure the voltage at the fuel pressure sensor with the key on, engine off. Expected should be close to 0.5V to 4.5V. If out of range, proceed to next step.
- 33. With the engine running, measure the voltage again at the sensor. If it fluctuates wildly or stays constant outside the expected range, replace the sensor.
- 44. If the sensor reads correctly, check the wiring from the sensor to the ECM for continuity and shorts. Repair any faulty wiring.
- 55. Clear codes and retest. If the code returns immediately, the ECM may need further diagnosis.
Common causes
- Faulty fuel pressure sensor
- Wiring or connector issues between sensor and ECM
- Corroded or loose connections in the fuel pressure sensing circuit
- Electrical interference from other components
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive for long; performance may be affected, including fuel delivery issues.
Will this code come back after replacement?
If the wiring and connections are good, replacing the sensor should resolve the issue.
Why does this code sometimes pair with SPN 3328?
SPN 3328 indicates a similar issue with the fuel system pressure, so they often appear together when there's a fuel pressure problem.
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