P052EPCV Regulator Valve Performance
- 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
- 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.
- What you may notice
- Check engine light on
- Whistling or hissing in the engine bay
- Rough idle, blue smoke or oil consumption, lack of power
- Likely causes
- LikelyDiaphragm of the regulating valve torn or fatigued
- LikelyPart-load ventilation valve blocked (oil carbon, sludge)
- PossibleElbow or hose at the valve cracked, clamp leaking
- PossibleEngine module software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.