Engine Oil Pressure Low
The engine oil pressure is lower than expected during operation.
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What it means (plain English)
The engine's oil pressure is reading low, which means the oil isn't circulating properly to keep everything lubricated. This can lead to engine damage if not fixed.
What the computer is actually seeing
The ECM measures oil pressure via a sensor that outputs a voltage signal. A voltage of less than 0.5 volts indicates low pressure, typically when pressure drops below 5 PSI while the engine is running.
What a healthy reading looks like
Expect oil pressure to be between 10-60 PSI at idle and up to 80 PSI at full throttle, depending on engine design and temperature.
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; it should be between the 'Min' and 'Max' marks on the dipstick. If low, add oil accordingly.
- 2Inspect the oil pressure sensor wiring for damage or loose connections. Repair as necessary.
- 3Test the oil pressure using a mechanical gauge at the oil pressure sensor port. Verify that it is within the expected range (10-60 PSI). If low, proceed to the next step.
- 4Replace the oil filter if it looks clogged or hasn't been changed in more than 5,000 miles or 6 months, whichever comes first.
- 5If oil pressure remains low, inspect the oil pump. Remove the oil pan to check for mechanical issues or failures.
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
- Faulty oil pressure sensor
- Oil viscosity too low for temp 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 severe engine damage.
Will this code come back after clearing?
If the issue remains unresolved, yes, it will likely come back.
Why does it pair with SPN 2444?
SPN 2444 indicates a fault in the oil pressure sensor, which can produce readings consistent with SPN 2425.
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