P055F
Engine Oil Pressure Out of Range
The measured oil pressure is far outside the expected range for current engine speed and oil temperature - either too low (oil pump weak, oil level low, bearing wear) or anomalously high (relief valve stuck closed, blocked oil cooler).
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Oil pump worn or oil level lowCommon
- Pressure relief valve stuckPossible
Parts involved
- Oil Pump
- Oil Pressure Sensor A
- Oil Relief Valve
P055F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.