Engine Oil Pressure Sensor Voltage High
The engine oil pressure sensor is reporting too high a voltage.
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What it means (plain English)
When the engine computer checks the oil pressure sensor, it sees a voltage reading that's higher than expected—this can mean there's a problem with the sensor or the oil pressure is actually too high.
What the computer is actually seeing
The engine control module (ECM) expects a voltage between 0.5V (low pressure) and 4.5V (high pressure) from the oil pressure sensor under normal conditions. When it sees a voltage above 4.5V, it triggers SPN 1331.
What a healthy reading looks like
Normal oil pressure typically gives around 0.5V to 4.5V. If readings exceed 4.5V, it indicates a fault.
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 engine oil level; fill if low. Decision: Is oil level adequate? If no, fix the oil level and retest.
- 2Inspect the wiring and connector to the oil pressure sensor. Look for signs of damage or corrosion. Decision: Are connections solid? If no, repair or replace as needed and retest.
- 3Use a multimeter to check the oil pressure sensor output voltage with the engine running. Decision: Is the voltage over 4.5V? If yes, sensor is likely faulty; replace it.
Common causes
- Faulty oil pressure sensor
- Wiring issues (short to voltage)
- Faulty engine oil pump causing excessive pressure
- ECM malfunction
- Poor ground connection
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best not to drive until you check the oil level and sensor; high oil pressure can lead to engine damage.
Will this come back after I clear it?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code appear with low oil pressure warnings?
If the sensor is faulty or the wiring is shorted, it can report false high values, causing confusion with low pressure warnings.
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