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P3621

Cylinder Deactivation System Bank 2 Malfunction

2014-2021 Mazda Mazda6 2.5L I4

High SeverityPowertrainGeneric (SAE)

Description

The cylinder deactivation system for Bank 2 has detected a fault.

Symptoms

  • Check Engine Light
  • Vibration during cruising
  • Cylinder deactivation disabled
  • Poor fuel economy
  • Engine roughness
  • MIL and vibration together

Common Causes

  • Bank 2 deactivation solenoid failure
  • VLOM issue Bank 2
  • Low oil pressure
  • Collapsed lifter Bank 2
  • Oil passage restricted

Diagnostic Steps

  1. Read Bank 2 deactivation PIDs
  2. Command Bank 2 deactivation
  3. Check oil pressure at Bank 2
  4. Test Bank 2 solenoid resistance
  5. Monitor Bank 2 cylinder balance

Repair Notes

Replace Bank 2 deactivation solenoid or VLOM. Use AFM-compatible oil.

Related Codes

P3620Cylinder Deactivation System Bank 1 MalfunctionP3622Cylinder Deactivation Solenoid Circuit Open - Cylinder SpecifiedP3623Cylinder Deactivation Lifter Stuck Activated

Other Powertrain Codes

P3621 on Other Vehicles

Common Questions

What does code P3621 mean on a 2014-2021 Mazda Mazda6?

P3621 stands for "Cylinder Deactivation System Bank 2 Malfunction". The cylinder deactivation system for Bank 2 has detected a fault.

What are the symptoms of P3621 on a Mazda Mazda6?

Common symptoms of P3621 include: Check Engine Light, Vibration during cruising, Cylinder deactivation disabled, Poor fuel economy, Engine roughness, MIL and vibration together.

What causes P3621 on a 2014-2021 Mazda Mazda6?

Common causes of P3621 include: Bank 2 deactivation solenoid failure, VLOM issue Bank 2, Low oil pressure, Collapsed lifter Bank 2, Oil passage restricted.

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