Injector Pressure Sensor Circuit Low
The injector pressure sensor is reporting a low voltage signal.
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What it means (plain English)
The injector pressure sensor measures the fuel pressure going to the injectors. If it's reading lower than normal, the engine might not get enough fuel, leading to poor performance.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the pressure sensor between 0.5 volts (minimum fuel pressure) and 4.5 volts (maximum fuel pressure).
What a healthy reading looks like
Injector pressure typically ranges from 50 to 80 psi, corresponding to sensor signals of 1 to 4 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. Inspect the wiring and connector at the injector pressure sensor for damage, corrosion, or loose connections. If found, repair or replace as necessary.
- 22. With the ignition on (engine off), use a multimeter to check the voltage at the injector pressure sensor connector. Reference ground and check for 5V power supply. If absent, check wiring back to the ECM.
- 33. Start the engine and monitor the injector pressure sensor output voltage. It should change with engine RPM and stay within 1-4 volts. If it stays low, replace the pressure sensor.
- 44. If the sensor is reading correctly but the vehicle performance is still off, check the fuel pump operation and make sure the fuel filter is not clogged.
Common causes
- Faulty injector pressure sensor
- Wiring issues in the sensor circuit
- Bad fuel pump
- Clogged fuel filter
- ECM malfunction
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal; you may experience reduced power and efficiency. Fix it soon.
Will this code come back after a repair?
If the repair is done correctly and the issues are resolved, the code should not return.
Why does this code often pair with fuel pressure codes?
A faulty injector pressure sensor can cause misleading signals about fuel system health, triggering related fuel pressure codes.
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