P052E — Positive crankcase ventilation (PCV) regulator valve performance

Code P052E is a standard OBD-II diagnostic trouble code: Positive crankcase ventilation (PCV) regulator valve performance.

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In our record, P052E is reported most often on Mercedes-Benz and INFINITI vehicles , against engine and electrical failure patterns , across 2014–2018 model years. Mercedes-Benz alone accounts for 95% of them.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P052E across 19 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report P052E 19 patterns

2018 Mercedes-Benz C-Class

engine — Positive Crankcase Ventilation (PCV) regulator valve failure

2018 Mercedes-Benz GLC-Class

engine — Positive Crankcase Ventilation (PCV) Valve Malfunction

2017 INFINITI Q60

engine — P052E Crankcase Ventilation Valve Failure

2017 Mercedes-Benz C-Class

engine — Crankcase Ventilation (PCV) Valve Malfunction

2017 Mercedes-Benz C-Class

electrical — PCV Valve Fault Codes and Engine Check Light

2017 Mercedes-Benz GLC-Class

engine — Positive Crankcase Ventilation (PCV) regulator valve failure

2017 Mercedes-Benz E-Class

engine — Positive Crankcase Ventilation (PCV) valve failure

2017 Mercedes-Benz C-Class

powertrain — Crankcase ventilation valve (PCV) malfunction

2016 Mercedes-Benz C-Class

engine — Positive Crankcase Ventilation (PCV) Regulator Valve Failure

2016 Mercedes-Benz C-Class

electrical — Positive Crankcase Ventilation (PCV) valve failure

2016 Mercedes-Benz GLC-Class

engine — Positive Crankcase Ventilation (PCV) system malfunction

2016 Mercedes-Benz C-Class

powertrain — Positive Crankcase Ventilation (PCV) Valve Failure

2016 Mercedes-Benz Metris

engine — Crankcase ventilation valve (PCV) failure

2016 Mercedes-Benz GLA-Class

engine — Unplanned engine shutdown/stalling while driving

2015 Mercedes-Benz C-Class

engine — Positive crankcase ventilation (PCV) valve malfunction

2015 Mercedes-Benz C-Class

electrical — Engine code P052E / PCV crankcase vent valve failure

2015 Mercedes-Benz CLA-Class

engine — Positive Crankcase Ventilation (PCV) Regulator Valve Malfunction

2015 Mercedes-Benz C-Class

powertrain — Positive Crankcase Ventilation (PCV) system failure with oil leakage

2014 Mercedes-Benz CLA-Class

engine — Crankcase ventilation (PCV) valve failure

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →