P3425Średni
Cylinder 4 – przerwa w obwodzie sterowania zaworem dolotowym dezaktywacji cylindra. PCM wykrył nieprawidłowe napięcie lub rezystancję w obwodzie kontrolnym zaworu dezaktywacji cylindra nr 4.
Układ napędowy
Sprawdź szczegóły →P3400
ŚredniCylinder Deactivation Problem – Bank 1. The cylinder shutdown system detected an abnormality in the valve control circuit for Bank 1.
OBD-II (EN): Cylinder Deactivation Control Circuit Malfunction Bank 1
Code P3400 indicates incorrect operation of the cylinder deactivation system on Bank 1 – a system that shuts off some cylinders to save fuel. The most common causes are problems with oil pressure, contaminated oil, or a damaged OCV control valve. Professional diagnosis is recommended, as ignoring the fault can lead to increased fuel consumption and potential engine damage.
Symptoms
- MIL (Check Engine) light on - Noticeable decrease in engine power - Increased fuel consumption - Uneven engine operation (vibrations) - Engine may only run on full cylinder count (deactivation disabled) - Possible jerking during acceleration
Possible causes
- Damaged Oil Control Valve (OCV) responsible for cylinder deactivation on Bank 1 - Low engine oil pressure or contaminated oil preventing proper hydraulic valve operation - Damage to cylinder lifters/tappets on Bank 1 - Damaged or intermittent wiring/connector in the cylinder deactivation circuit - Engine control module (ECM/PCM) fault – rarely
Affected systems
Układ dezaktywacji cylindrów (AFM/VCM/MDS)Układ smarowania silnikaUkład sterowania silnikiem (ECM/PCM)Zawory sterujące olejem (OCV)Układ rozrządu (VVT)
Related codes
Does code P3400 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.