P3420 OBD II Trouble Code Cylinder 3 Deactivation/Intake Valve Control Circuit High

How to quickly diagnose and repair, and causes of a P3420 electrical code which indicates a high electrical value in cylinder 3 deactivation or intake valve control circuit.

Symptoms of P3420 OBD II Trouble Code

  • Engine may misfire
  • Increased fuel consumption
  • Poor engine performance
  • Service engine soon light illuminated
  • Check engine light illuminated

Common Causes of P3420 OBD II Trouble Code

  • Defective cylinder deactivation solenoid
  • Low engine oil level or pressure
  • Restricted oil passage
  • Faulty or damaged wiring
  • Corroded, damaged or loose connector
  • Defective ECM

Severity of P3420 OBD II Trouble Code

The severity of this code can vary tremendously from moderate to severe depending on the specific symptoms of the malfunction. A misfire requires immediate attention because it can cause permanent damage to internal engine components.