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
- Read Bank 2 deactivation PIDs
- Command Bank 2 deactivation
- Check oil pressure at Bank 2
- Test Bank 2 solenoid resistance
- Monitor Bank 2 cylinder balance
Repair Notes
Replace Bank 2 deactivation solenoid or VLOM. Use AFM-compatible oil.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
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.