P052A — Positive Crankcase Ventilation Regulator Valve Performance
What it means: Positive Crankcase Ventilation Regulator Valve Performance.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Inspect PCV valve and breather filter
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Salt Lake City, UT
Closest first. Tell them P052A and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Salt Lake City, UT · (801) 531-9256
- 0.0 mi away — based in Salt Lake City, UT · (385) 503-8084
- 0.0 mi away — based in Salt Lake City, UT · (385) 386-4700
Seen on: Heavy Truck
What P052A means
Positive Crankcase Ventilation Regulator Valve Performance. Common causes: PCV valve fault.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- PCV valve fault
- Stuck PCV valve
- plugged breather filter
First moves (roadside)
- Inspect PCV valve and breather filter
- check crankcase pressure
- replace if stuck
FAQ
Positive Crankcase Ventilation Regulator Valve Performance. Common causes: PCV valve fault.
Caution — Limp to the next safe stop.
The most common cause is: PCV valve fault. Other possibilities include Stuck PCV valve; plugged breather filter.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P052A, or share the same subsystem.
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Intake Manifold (Charge Air) Temp — High (SPN 105 FMI 0)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Injection control pressure low (HEUI — older engines) (SPN 164 FMI 1)
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.