Fuel Pressure Sensor Circuit Voltage High
Fuel pressure sensor is reporting a voltage value that's too high.
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What it means (plain English)
The fuel pressure sensor sends the ECM a signal voltage between 0.5V and 4.5V; when it's higher than that, it means there's a wiring issue or a bad sensor.
What the computer is actually seeing
The ECM detects a voltage reading from the fuel pressure sensor that's above 4.5V, which indicates an electrical fault.
What a healthy reading looks like
Normal fuel pressure sensor voltage should be between 0.5V to 4.5V, corresponding to a fuel pressure range from 5 PSI to 70 PSI.
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. Inspect the wiring and connectors to the fuel pressure sensor for damage, shorts, or corrosion. Decision: Is the wiring intact? If yes, proceed to Step 2; if no, repair the wiring and retest.
- 22. With the key on, engine off, use a multimeter to check the voltage at the fuel pressure sensor connector. Expect a reading between 0.5V and 4.5V. Decision: Is the voltage within range? If yes, proceed to Step 3; if no, replace the fuel pressure sensor.
- 33. Check the resistance of the fuel pressure sensor. It should be within manufacturer specifications (typically around 5-10 ohms). Decision: Is the resistance within spec? If yes, check the ECM; if no, replace the fuel pressure sensor.
Common causes
- Short circuit in the wiring harness to the fuel pressure sensor
- Faulty fuel pressure sensor
- Open circuit in the wiring harness
- Poor connections at the sensor or ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code?
It's drivable but can lead to poor engine performance or fuel delivery issues, so get it fixed soon.
Will this code come back after I clear it?
If the underlying issue isn't resolved, yes, it will return.
Why does this code sometimes come with low fuel pressure codes?
High voltage from the sensor can cause erroneous readings, leading to low pressure codes as the ECM thinks pressure is too low.
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