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Home/DTC Codes/Lincoln/MKX/2018-2018 2.7L EcoBoost V6/P3621
P3621

Cylinder Deactivation System Bank 2 Malfunction

2018-2018 Lincoln MKX 2.7L EcoBoost V6

High SeverityPowertrainGeneric (SAE)

The 2018 Lincoln MKX is equipped with a 2.7L V6 turbocharged gasoline engine. Below you'll find detailed p3621 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

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

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Lincoln Aviator

2021-2021 3.0L Twin-Turbo V6

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2021-2021 3.0L V6 Twin Turbo

Lincoln Aviator

2022-2022 3.0L Twin-Turbo V6

Lincoln Aviator

2022-2022 3.0L V6 Twin Turbo

Lincoln Aviator

2023-2023 3.0L Twin-Turbo V6

Common Questions

What does code P3621 mean on a 2018-2018 Lincoln MKX?

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 Lincoln MKX?

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 2018-2018 Lincoln MKX?

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

Last updated: March 2026

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