P052E on Audi
Positive Crankcase Ventilation Regulator Valve Performance
P052E on Audi vehicles indicates positive crankcase ventilation regulator valve performance. Au7o has documented this code across 2 Audi models — most commonly on A4, SQ5. P052E indicates a performance problem with the positive crankcase ventilation (PCV) regulator valve, the valve that meters blow-by gases from the engine crankcase back into the intake to be burned. The computer monitors crankcase pressure or related readings, and when the PCV regulator isn't controlling flow within the expected range, it sets this code. Symptoms can include rough idle, oil leaks from seals due to pressure imbalance, whistling/sucking noises, or increased oil consumption. It points to the PCV valve or ventilation system rather than the fuel or ignition system. Typical repair costs on Audi range from $300 to $5,000, depending on the specific model and root cause.
Common Causes of P052E
- •Stuck, clogged, or failed PCV regulator valve
- •Cracked or disconnected PCV hose/line
- •Vacuum leak in the crankcase ventilation system
- •Clogged PCV passages from sludge or carbon
- •Faulty crankcase pressure sensor
- •Damaged valve cover with integrated PCV (where applicable)
- •Wiring or connector fault on electrically controlled PCV valves
P052E on Audi by Model
Audi A4(2 issues)
- Excessive Oil Consumption2009-2016
Early 2.0T engines can consume oil at high rates, sometimes 1 quart every 1,000 miles or less. This is often related to piston ring design or PCV system issues. Audi extended warranty for some affected vehicles.
- PCV Valve/Breather System Failure2009-2015
The PCV system can fail, causing rough idle, boost leaks, and increased oil consumption. The diaphragm in the valve cover can tear. This is a common issue on earlier 2.0T engines.
Audi SQ5(1 issue)
- PCV Valve Failure Under Supercharger (3.0T)2014-2017
The 2014-2017 Audi SQ5 with the 3.0T supercharged V6 (EA837) suffers from PCV (Positive Crankcase Ventilation) valve failures. The PCV valve is located underneath the Eaton supercharger, making replacement labor-intensive and expensive. When the PCV fails, it causes rough idle, misfires, oil consumption, and can damage seals and gaskets from excess crankcase pressure. The DTC P052E (PCV Regulator Valve Performance) is triggered, though the issue is often the connected breather hose (PN 06E103207AP) rather than the valve itself. At higher mileages, this is nearly inevitable and typically occurs between 60,000-80,000 miles.
Looking for P052E on a different make?
View P052E across all makes →Frequently Asked Questions
What does P052E mean on Audi?▼
P052E stands for "Positive Crankcase Ventilation Regulator Valve Performance." P052E indicates a performance problem with the positive crankcase ventilation (PCV) regulator valve, the valve that meters blow-by gases from the engine crankcase back into the intake to be burned. The computer monitors crankcase pressure or related readings, and when the PCV regulator isn't controlling flow within the expected range, it sets this code. Symptoms can include rough idle, oil leaks from seals due to pressure imbalance, whistling/sucking noises, or increased oil consumption. It points to the PCV valve or ventilation system rather than the fuel or ignition system. On Audi specifically, this code is documented across 2 models.
What causes P052E on Audi vehicles?▼
Common causes on Audi: Stuck, clogged, or failed PCV regulator valve, Cracked or disconnected PCV hose/line, Vacuum leak in the crankcase ventilation system, Clogged PCV passages from sludge or carbon, Faulty crankcase pressure sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P052E on a Audi?▼
Repair costs on Audi range from $300 to $5,000, depending on the specific model and root cause.
Which Audi models have P052E documented?▼
Au7o has documented P052E on 2 Audi models: A4, SQ5.