Engine Oil Pressure Sensor Fault
The engine control unit has detected an abnormal oil pressure signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine oil pressure sensor is sending a signal that's too high or too low, meaning the engine might not have proper oil circulation, which can lead to serious damage.
What the computer is actually seeing
The ECM expects a voltage between 0.5V to 4.5V from the oil pressure sensor to indicate pressure ranging from 0 to 100 psi. A signal outside this range triggers the code.
What a healthy reading looks like
Normal oil pressure should be between 25 psi to 75 psi at idle and above 15 psi when the engine is cold.
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 engine oil level – must be between ADD and FULL marks.
- 22. Inspect oil filter for clogs or restrictions.
- 33. Using a multimeter, check the voltage at the oil pressure sensor connector; should be 0.5V to 4.5V. If out of range, replace the sensor.
- 44. Check wiring and connectors for damage or corrosion.
- 55. If oil pressure sensor checks out, perform an oil pressure test with a mechanical gauge. Should read 25-75 psi at idle. If not, suspect oil pump failure or engine issue.
Common causes
- Faulty oil pressure sensor
- Low engine oil level
- Clogged oil filter
- Oil pump failure
- Wiring or connector issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 379 active?
No, driving with low oil pressure can cause severe engine damage.
Will the code come back after fixing?
If the issue is resolved, this code should not return.
Why does SPN 379 appear with other codes?
Multiple codes may indicate issues related to the oil system or other engine sensors.
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