Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P052E PCV Regulator Valve Performance
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo
P052E is a function fault of the crankcase ventilation pressure regulating valve. Audi's 3.0 TFSI has a diaphragm valve whose torn diaphragm or elbow causes false air and whistling; Mercedes' M270/M274 have a switched part-load ventilation valve that blocks with oil carbon and lets oil into the intake – blue smoke, rough running, lack of power; Mercedes extended the emission warranty on the intake module. GM Europe's 2.0 diesel in the Saab 9-5 uses P052E differently, for PCV heater performance – which J2012 lists as P053D.
Likely causes
Diaphragm of the regulating valve torn or fatigued
Part-load ventilation valve blocked (oil carbon, sludge)
Elbow or hose at the valve cracked, clamp leaking
Engine module software
Symptoms
- Check engine light on
- Whistling or hissing in the engine bay
- Rough idle, blue smoke or oil consumption, lack of power
Repair estimate
DifficultyHardWorkshop job
Parts and labour€80–1,200
Time1–5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
pcv regulator valvecrankcase ventilation hoseengine control module
Related codes
References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.