Engine Oil Pressure Sensor Voltage High
Oil pressure sensor voltage is higher than acceptable range.
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What it means (plain English)
The engine oil pressure sensor is sending a voltage signal that indicates the oil pressure is too high or the sensor itself is malfunctioning, causing the engine control module to trigger a fault code.
What the computer is actually seeing
The engine control module (ECM) expects the oil pressure sensor to send a voltage in the range of 0.5V (low pressure) to 4.5V (high pressure). When it sees a voltage consistently above 4.5V, it triggers this code.
What a healthy reading looks like
Normal oil pressure voltage should range between 0.5V and 4.5V depending on engine RPM and load.
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 wiring and connectors to the oil pressure sensor for damage or corrosion. If damaged, repair or replace as needed. Decision point: Are the connections clean and intact?
- 22. Measure the voltage at the oil pressure sensor connector with the key on and engine off. Expect 0.5V to 4.5V. Decision point: Is the voltage above 4.5V?
- 33. If the voltage is above 4.5V, disconnect the sensor and check the wire harness for short to power. Test for continuity to ground. Decision point: Is there a short?
- 44. If no short is found, replace the oil pressure sensor. Decision point: Was replacing the sensor successful in clearing fault code?
Common causes
- Faulty oil pressure sensor
- Shorted wires or connectors
- Oil pressure relief valve issues
- Incorrect oil viscosity or level
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code as it can indicate high oil pressure, which can lead to engine damage.
Will this code come back after clearing it?
If the underlying issue is not fixed, the code may return shortly after clearing.
Why does this code pair with SPN 6344?
SPN 6344 indicates low oil pressure, while SPN 6345 indicates high oil pressure; both codes suggest issues with the oiling system.
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