Problem z dezaktywacją cylindrów – Bank 1. Układ wyłączania cylindrów wykrył nieprawidłowość w obwodzie sterowania zaworami Bank 1.
P3420
ŚredniCylinder 3 – deactivation / intake valve control circuit – voltage too high. The engine control module has detected an excessively high electrical signal in the control circuit of the intake valve responsible for deactivating cylinder number 3.
OBD-II (EN): Cylinder 3 Deactivation Intake Valve Control Circuit High
Code P3420 indicates a problem with the electrical control circuit of the intake valve for cylinder 3 deactivation – the engine computer reads excessively high voltage in this circuit. The most common causes are a faulty solenoid, low oil pressure, or damaged wiring. Due to the complexity of the cylinder deactivation system (AFM/MDS), diagnosis at a workshop with a professional diagnostic scanner is recommended.
Symptoms
Check Engine Light (MIL) illuminated on the dashboard Possible engine hesitation or vibrations (misfire) Increased fuel consumption Reduced engine power and performance Cylinder deactivation system (AFM/MDS) may be disabled by the ECU Possible noticeable engine roughness at idle
Possible causes
Faulty or shorted cylinder 3 deactivation solenoid Low engine oil level or insufficient oil pressure Clogged oil passage supplying the deactivation mechanism Damaged, burnt, or corroded control circuit wiring Corroded or loose electrical connectors at the solenoid Faulty engine control module (ECM/PCM) – rare
Affected systems
Related codes
Cylinder 4 – przerwa w obwodzie sterowania zaworem dolotowym dezaktywacji cylindra. PCM wykrył nieprawidłowe napięcie lub rezystancję w obwodzie kontrolnym zaworu dezaktywacji cylindra nr 4.
Dezaktywacja cylindra 2 / wydajność obwodu sterującego zaworem dolotowym. Układ dezaktywacji cylindrów wykrył nieprawidłowe działanie zaworu dolotowego w cylindrze nr 2.
Suggested Hybspec services
Based on the systems affected by this code, we will most likely start with:
Does code P3420 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.
