Engine Oil Pressure Sensor Circuit Low
Indicates a low voltage signal from the engine oil pressure sensor.
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What it means (plain English)
The engine oil pressure sensor is sending a low voltage signal, meaning the oil pressure is either genuinely low or the circuit is faulty.
What the computer is actually seeing
The engine control unit (ECU) sees a voltage from the oil pressure sensor below the expected range, generally less than 0.5 volts when it should be around 1-4 volts with the engine running.
What a healthy reading looks like
Expected oil pressure sensor voltage should be between 1 and 4 volts at normal operating temperatures.
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 engine oil level – should be within the safe range on the dipstick. Decision: If low, refill oil and retest. If okay, continue.
- 22. Inspect wiring harness and connectors to the oil pressure sensor for wear or damage. Decision: If damaged, repair or replace wiring. If good, continue.
- 33. Disconnect the oil pressure sensor and measure resistance across the terminals. Expected resistance should be close to zero ohms for a good sensor. Decision: If resistance is too high or infinite, replace the sensor. If resistance is okay, continue.
- 44. Test for proper voltage at the sensor connector with engine running. Expected voltage should be within 1-4 volts. Decision: If voltage is low, check wiring and ECU. If voltage is normal, replace the oil pressure sensor.
Common causes
- Faulty oil pressure sensor
- Oil pressure too low due to leaks or low oil level
- Wiring issues such as frayed or shorted wires
- Faulty ECU or connector issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe; low oil pressure can cause severe engine damage.
Will this code come back after resetting?
It can come back if the underlying issue isn't fixed, such as a leak or faulty sensor.
Why might it pair with SPN 1565?
SPN 1565 indicates an oil pressure sensor circuit high fault, which can occur if there's a fault in the sensor or wiring.
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