Fuel Pressure Sensor Voltage High
Indicates a high voltage reading from the fuel pressure sensor.
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What it means (plain English)
The engine computer is seeing a voltage from the fuel pressure sensor that is higher than expected, which can happen if there's a problem with the sensor itself or the wiring.
What the computer is actually seeing
The engine control module (ECM) reads a voltage from the fuel pressure sensor that exceeds the normal operational range, indicating a potential fault.
What a healthy reading looks like
Typical fuel pressure sensor voltage ranges from 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.
- 11. Check the fuel pressure sensor connector for corrosion or damage. Is it clean and free of shorts? If no, repair the connector or replace it.
- 22. Measure the voltage at the fuel pressure sensor with the key on, engine off. Is the voltage above 4.5 volts? If yes, suspect a faulty sensor or wiring issue.
- 33. If the voltage is normal, start the engine and monitor the voltage while running. Does it fluctuate normally as fuel pressure changes? If no, replace the sensor.
- 44. Inspect the wiring harness for shorts or open circuits. Is the insulation damaged or is there continuity in the wires? If issues found, repair wiring as needed.
Common causes
- Faulty fuel pressure sensor
- Wiring issues (short circuit)
- ECM failure
- Poor ground connection
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive but should fix it soon to avoid performance issues.
Will the code come back?
If the underlying issue isn't resolved, yes, the code is likely to return.
Why does this code appear with SPN 375?
SPN 375 relates to actual fuel pressure, so if the sensor reads high voltage, it may also incorrectly indicate problems with fuel pressure.
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