Engine Oil Pressure Sensor Circuit High Voltage
Indicates high voltage from the engine oil pressure sensor.
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What it means (plain English)
The engine oil pressure sensor is sending a voltage reading that’s higher than normal, signaling an issue with oil pressure or the sensor itself.
What the computer is actually seeing
The engine control module (ECM) reads the sensor voltage as being above the upper limit, typically above 4.5 volts, indicating potential oil pressure problems or a bad sensor.
What a healthy reading looks like
Normal oil pressure sensor voltage should be between 0.5 and 4.5 volts, representing oil pressure readings of 5-70 PSI in a healthy engine.
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 engine oil level. Ensure it's within the manufacturer's specification; if low, top up and retest.
- 22. Inspect the wiring and connectors at the oil pressure sensor for damage or corrosion; repair as needed.
- 33. Measure the voltage at the oil pressure sensor connector with the key on and the engine off; it should be between 0.5 and 4.5 volts. If it's higher, continue to step 4.
- 44. Disconnect the sensor and check again; if the voltage returns to normal (close to 0 volts), the sensor is faulty and needs replacement. If still high, proceed to the ECM.
- 55. Check the ECM for fault codes related to sensor circuits; if issues persist, consider testing or replacing the ECM.
Common causes
- Failed oil pressure sensor
- Wiring harness short to voltage
- Faulty engine oil pump
- Low oil level
- ECM malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not safe to drive; high oil pressure can cause engine damage.
Will this code come back after a reset?
If the issue isn’t resolved, it will return after the reset or on the next drive cycle.
Why do I see SPN 24 alongside SPN 25?
SPN 25 is often associated when there's a combined issue with the oil pressure sensor or circuit.
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