Fuel Pressure Sensor 1 Circuit - Voltage Above Normal
The engine's fuel pressure sensor signal voltage is too high.
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What it means (plain English)
Inside the fuel system, the sensor monitors fuel pressure and sends a voltage signal to the ECM. If this voltage is higher than 4.5 volts, it indicates a problem with the sensor or wiring instead of the actual fuel pressure being too high.
What the computer is actually seeing
The engine control module (ECM) expects the fuel pressure sensor signal to range between 0.5 to 4.5 volts for normal operation. Values above this range trigger the fault code.
What a healthy reading looks like
Fuel pressure sensor voltage should be between 0.5 volts and 4.5 volts; pressure values usually range from 250 to 300 kPa (36 to 43 psi) under normal conditions.
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 level in the tank. Ensure it is adequate for testing.
- 22. Inspect the wiring and connectors to the fuel pressure sensor for damage or corrosion.
- 33. Using a multimeter, measure the voltage at the fuel pressure sensor's connector. Expect 0.5 to 4.5 volts. If it is above 4.5 volts, go to step 4; if normal, replace the fuel pressure sensor.
- 44. Check for shorts in the wiring by disconnecting the sensor and measuring resistance from the ECM pin to the sensor connector. If resistance is low (near 0 ohms), wiring may be damaged; fix or replace wiring.
- 55. If wiring is intact, consider testing or replacing the fuel pressure sensor.
Common causes
- Bad fuel pressure sensor
- Wiring issues or shorts in the sensor circuit
- Faulty ECM
- Poor ground connection
- High fuel pressure due to a blocked fuel return line
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive the vehicle with this code, as it may affect fuel delivery and engine performance.
Will this code come back after clearing?
If the underlying issue is not resolved, yes, the code will likely return.
Why does this code sometimes pair with SPN 2237?
Both codes relate to fuel pressure issues, so a problem in the fuel system can trigger multiple faults.
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