Fuel Injector Pressure Sensor Failure
The fuel injector pressure sensor is reporting a malfunction.
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What it means (plain English)
The computer checks the fuel injector pressure using a sensor. If the sensor isn't working correctly, it can't report the right pressure readings, causing potential issues with fuel delivery.
What the computer is actually seeing
The fuel pressure sensor output voltage is outside of the expected range, typically less than 0.5V or greater than 4.5V, representing an abnormal fuel pressure condition.
What a healthy reading looks like
Expected output voltage from the sensor should be between 0.5V and 4.5V, correlating to a fuel pressure range of roughly 40-80 PSI depending on the application.
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 injector pressure sensor connector and wiring for damage or corrosion. If found, repair or replace as needed. Decision: Is wiring okay? (Yes/No)
- 22. With the engine running, use a scanner to monitor the fuel injector pressure sensor output. Check for voltage readings. Decision: Is voltage between 0.5V and 4.5V? (Yes/No)
- 33. If voltage is out of range, test the fuel pressure using a mechanical gauge to confirm actual fuel pressure matches expected values. Decision: Is actual fuel pressure within normal range? (Yes/No)
- 44. If pressure is correct but sensor voltage is still faulty, replace the fuel injector pressure sensor. Decision: Did replacing the sensor fix the issue? (Yes/No)
Common causes
- Faulty fuel injector pressure sensor
- Wiring issues or poor connections to the sensor
- Fuel pressure regulator malfunction
- Blocked fuel filter or fuel lines
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so fix it soon but it's driveable unless you notice poor engine performance.
Will this problem come back after repair?
If you correct the underlying issue, and replace the faulty parts, it should not return.
Why does this code pair with SPN 744?
SPN 744 relates to fuel pressure, indicating a common problem area with fuel delivery affecting both codes.
Working a real vehicle right now?
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