Oil Pressure Sensor - Low Voltage
Oil pressure sensor is reporting low voltage readings.
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What it means (plain English)
The oil pressure sensor is sending a low voltage signal, indicating that it might not be detecting enough oil pressure in the engine, usually below 0.5 volts when you'd expect at least 1.0 volt when the engine is running.
What the computer is actually seeing
The engine control module (ECM) is reading the oil pressure sensor's voltage signal, which should vary between 1.0 to 4.5 volts depending on the oil pressure condition. A low voltage reading (below 0.5 volts) triggers this fault code.
What a healthy reading looks like
Expected voltage at the sensor should be between 1.0 to 4.5 volts when the engine is running 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.
- 1Check the engine oil level to ensure it's within the proper range.
- 2Inspect the wiring harness and connectors at the oil pressure sensor for damage or corrosion.
- 3Using a multimeter, measure the voltage output of the oil pressure sensor; it should be between 1.0 to 4.5 volts when the engine is running.
- 4If voltage is below 0.5 volts, replace the oil pressure sensor and retest. If the problem persists, check the oil pump operation.
Common causes
- Faulty oil pressure sensor
- Corroded wiring or connectors
- Insufficient oil level in the engine
- Failed oil pump
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive, as low oil pressure can lead to engine damage.
Will this issue come back after fixing?
If the wiring and sensor are properly repaired or replaced, it shouldn't recur.
Why does this code pair with SPN 6804?
SPN 6804 indicates high voltage from the same sensor, pointing to potential electrical issues.
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