Fault Family System: Powertrain (P-Codes) 4 SAE Codes

PCV Regulator Valve Circuit

Diagnostic & Technical Explanation

Code P052E (PCV Regulator Valve Performance) sets when the ECM detects an open circuit, out-of-range voltage, or a performance fault while driving the electronically controlled PCV regulator valve that meters crankcase gas flow. Causes are a failed regulator solenoid coil, sludge or carbon jamming the valve plunger, or damaged control wiring between the ECM and the valve.

These 4 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P052E	PCV Regulator Valve Performance	4 ranked fixes
P05D8	PCV Regulator Valve Control Circuit/Open	4 ranked fixes
P05D9	PCV Regulator Valve Control Circuit Low	4 ranked fixes
P05DA	PCV Regulator Valve Control Circuit High	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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