Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P055F Engine Oil Pressure Out of Range
Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible
P055F is a condition code: the measured oil pressure is above the maximum expected for speed and oil temperature – Ford, which documents it, calls it 'too high' and pairs it with P0524 (too low). Ford checks continuously for 5 s, only with plausible oil pressure, oil temperature and coolant sensors, as engine protection. Background are regulated oil pumps, whose control valve (P06DA ff) defaults to full pressure on failure. An electrically high signal is P0523 or P055D instead.
Likely causes
Oil pump control valve or variable pump stuck at high pressure
Pump relief valve stuck
Wrong viscosity, very cold oil
Sensor A reading high within range
Symptoms
- Check engine light or oil pressure warning
- Possible engine protection or power limit
- Possible oil filter or seal leaks
Repair estimate
DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–6 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
oil pumpoil pump control valveoil pressure sensorengine control module
Related codes
References: fordservicecontent.com, law.cornell.edu.