What does it mean?
The P052E is a generic PCM thrown trouble code that means “Positive Crankcase Ventilation Regulator Valve Performance.” Getting this signal indicates that the PCM of your vehicle has noticed a failure or improper pressure in the crankcase through the crankcase pressure sensor. A crankcase ventilation regulator is designed to remove or regulate excessive gases from the crankcase during internal combustion. These excessive gasses are known as “Blow-by” gases.
The crankcase ventilation system was initially developed to allow mechanical engines to run underwater without allowing water to leak into the engine and cause damage. Modern engines have adopted this innovation to get blow-by gasses out of the engine. The crankcase ventilation system consists of an intake manifold, a one way valve, and a tube. The PCV (Positive crankcase ventilation) system regulates pressure in the engine by sucking unwanted gases to reduce pressure.
These gases are removed via an oil separator vent line that connects from the filter to the oil separator. The oil separator and vent line are connected via a port in the crankcase. Vehicles are designed to come with a crankcase pressure sensor that sends signals to the PCM while monitoring air density in the engine. The pressure is measured in kilopascals (kPa) or inches of mercury(Hg).
Depending on the manufacturer’s design, the crankcase pressure sensor is usually placed close to the engine valve or in it. The PCV vacuum is designed with a PCV controller valve in most vehicles. The controller’s terminals are supplied with constant voltage from the car battery, while the PCM reads this voltage to determine the degree of pressure needed in the engine.
You would most likely get a DTC P052E trouble code when your vehicle’s PCM indicates that the pressure detected through the sensor is improper. The PCM relies on the information produced by the crankcase pressure sensor to determine the proper pressure needed for the engine to work efficiently. Car owners will notice excessive noise coming out of the engine of their vehicles. This will usually be followed by a check engine warning light.
The severity of this DTC trouble code is treated as serious and should be attended to avoid further damages to the vehicle. A faulty crankcase can lead to the engine leaking fluids. To fix the P052E trouble code, I recommend you first inspect the crankcase pressure sensor and replace if faulty. In most cases, this will be sufficient to solve the problem. Also, examine the PCV regulator valve for any damage and repair or replace it. Check for wire connections short and fix them properly.
And finally, ensure that your car PCM is well programmed. All of these steps are known to fix the DTC error.