P055DEngine Oil Pressure Sensor/Switch B High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Cam phasing or valve lift switching possibly restricted
- Often no noticeable symptoms
- Likely causes
- LikelySensor ground open
- PossibleSignal shorted to 5 V or 12 V
- PossibleSensor B faulty internally
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.