P052E on Infiniti
Positive Crankcase Ventilation Regulator Valve Performance
P052E on Infiniti vehicles indicates positive crankcase ventilation regulator valve performance. Au7o has documented this code across 1 Infiniti model — most commonly on Q50. 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 Infiniti range from $200 to $4,000, 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 Infiniti by Model
Infiniti Q50(1 issue)
- M274 2.0T Excessive Oil Consumption2014-2018
The M274 four-cylinder in the 2.0t burns noticeably more oil than owners expect, and consumption climbs with mileage. Reports commonly describe roughly a quart per 3,000 miles once the car passes 60,000 miles, with worse cases burning a quart every 1,500 miles. The usual contributors are piston ring wear and coking, valve stem seal hardening, and the crankcase ventilation system pulling oil vapor into the intake. Because the Q50 has no oil dipstick on this engine — the level is read through the instrument cluster — owners often do not notice the loss until the low-oil warning appears, and running the engine chronically low is what turns oil consumption into timing chain and bearing damage.
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What does P052E mean on Infiniti?▼
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 Infiniti specifically, this code is documented across 1 model.
What causes P052E on Infiniti vehicles?▼
Common causes on Infiniti: 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 Infiniti?▼
Repair costs on Infiniti range from $200 to $4,000, depending on the specific model and root cause.
Which Infiniti models have P052E documented?▼
Au7o has documented P052E on 1 Infiniti model: Q50.