Engine Oil Pressure Low
The engine control module detected low oil pressure.
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What it means (plain English)
The computer is saying that the oil pressure in the engine is lower than what it should be, which could mean the oil is too low or there's a problem with the oil pump.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the oil pressure sensor output, which should typically be between 20-80 psi when the engine is running. Anything below 20 psi for more than a few seconds can trigger this code.
What a healthy reading looks like
Normal oil pressure should be between 20-80 psi depending on engine temperature and RPM. Check manufacturer specifications for your specific 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 using the dipstick and add oil if low, ensuring it's within the recommended range.
- 22. Inspect the oil pressure sensor connector and wiring for any damage or corrosion, repair as needed.
- 33. Start the engine and monitor the oil pressure gauge (if present), ensuring it rises to the expected range of 20-80 psi.
- 44. If oil pressure is low, replace the oil filter and consider replacing the oil to ensure proper flow, then retest.
- 55. If the issue persists, test the oil pressure with a manual gauge to confirm the sensor reading, replacing the oil pressure sensor if out of spec.
Common causes
- Low engine oil level
- Oil pump failure
- Clogged oil filter
- Faulty oil pressure sensor
- Wiring issue to the oil pressure sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Not recommended. Low oil pressure can cause serious engine damage.
Will this code come back after clearing?
It may return if the issue causing low oil pressure isn't resolved.
Why does this code appear with others like SPN 1638?
Other codes may indicate related issues, such as oil temperature or engine load problems.
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