P055D code meaning
Engine Oil Pressure Sensor/Switch B High
Powertrain system Generic code P05xx codes Check engine light
What P055D means
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.
P055D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P055D
- Check engine light on
- Cam phasing or valve lift switching possibly restricted
- Often no noticeable symptoms
Common causes of P055D
- Most likelySensor ground open
- PossibleSignal shorted to 5 V or 12 V
- PossibleSensor B faulty internally
- Less likelyEngine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oil pressure sensor bSensor wiringEngine control module
What each part of P055D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 5D | The exact fault in that area. |
What to do next
- Note P055D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P055D
What does P055D mean?
P055D means "Engine Oil Pressure Sensor/Switch B High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P055D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P055D fail an emissions test?
Yes, it can. P055D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P055D to fix?
Difficulty: medium. A typical repair takes 0.5 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P055D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.