Engine Oil Pressure Sensor Fault
Oil pressure sensor signal is out of expected range.
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What it means (plain English)
The engine computer is getting a signal from the oil pressure sensor that indicates pressure is either too high or too low, which can mean there’s a real problem with oil flow or the sensor itself.
What the computer is actually seeing
The oil pressure sensor sends a voltage signal based on the oil pressure it detects. Normal operating pressure is usually between 20-80 PSI. A signal below 0.5 volts or above 4.5 volts is seen as a fault.
What a healthy reading looks like
Expected oil pressure at idle is between 10-20 PSI, and at higher RPMs, it should be between 40-80 PSI depending on engine type.
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; refill if below minimum and recheck the code.
- 2Inspect the oil pressure sensor wiring and connector for any damage, corrosion, or loose connections.
- 3Using a scan tool, monitor the oil pressure sensor voltage while the engine is running. It should read between 0.5V to 4.5V. If it's out of range, replace the sensor.
- 4Check oil pressure using a mechanical gauge. Connect the gauge to the oil pressure sending unit port and compare readings with the computer. If gauge reads normal and the sensor is out of range, replace the sensor.
Common causes
- Faulty oil pressure sensor
- Low oil level
- Oil pump failure
- Electrical issue (wiring/connectors)
- Oil viscosity too high or low for conditions
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, driving with low oil pressure can cause serious engine damage.
What happens if I ignore this code?
Ignoring this code could lead to engine failure due to inadequate lubrication.
Why does this code come with a low oil level warning?
A low oil level can cause drops in oil pressure, triggering this fault code.
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