P052E
PCV Regulator Valve Performance
The crankcase ventilation regulator valve - which throttles blow-by gas flow toward the intake based on engine load - is electrically intact but does not deliver the modelled pressure regulation. Either the valve diaphragm is fatigued or the spring is weak.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Diaphragm fatiguedCommon
- Regulator spring weakPossible
Parts involved
- PCV Regulator Valve
P052E is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.