Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P055D Engine Oil Pressure Sensor/Switch B High
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo
Oil pressure sensor B is a second sensor, usually in the oil feed to the cam phasers or valve lift switching – on GM's 2.5 L (2014 Impala and Malibu) in the camshaft cover – while sensor A measures the main gallery. Documented only by GM (type B, two trips); Ford uses no sensor B. P055D means the signal is too high – a signal shorted to 5 V or battery voltage or an open sensor ground. GM sets it at a reading of 1000 kPa or more in 120 of 150 samples. Real excess oil pressure is reported separately, by Ford under P055F. The module uses a substitute value.
Likely causes
Sensor ground open
Signal shorted to 5 V or 12 V
Sensor B faulty internally
Engine module
Symptoms
- Check engine light on
- Cam phasing or valve lift switching possibly restricted
- Often no noticeable symptoms
Repair estimate
DifficultyMediumDIY possible
Parts and labour€40–250
Time0.5–1.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
oil pressure sensor bsensor wiringengine control module
Related codes
References: gsi.ext.gm.com, law.cornell.edu.