Cylinder Deactivation Lifter Stuck Activated
2002-2005 Ford Explorer 4.6L V8 🇨🇦
Description
A cylinder deactivation lifter is mechanically stuck in the deactivated (collapsed) position. The affected cylinder is not firing.
Symptoms
- Check Engine Light
- Engine misfire
- Rough idle and vibration
- Reduced power
- Exhaust smell of unburned fuel
- Catalytic converter damage risk
Common Causes
- Collapsed lifter mechanism
- Oil sludge jamming lifter
- Lifter roller bearing failure
- Oil pressure loss to lifter
- Excessive wear on lifter body
Diagnostic Steps
- Identify which cylinder is deactivated permanently
- Check oil pressure at affected lifter
- Perform compression test on that cylinder
- Check for oil sludge
- Inspect lifter via valve cover removal if accessible
Repair Notes
Replace collapsed deactivation lifter. This requires camshaft and lifter removal. Inspect cam lobe for damage. Full engine oil flush recommended.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
P3623 on Other Vehicles
Ford Bronco
2021-2024 2.3L I4 EcoBoost
Ford Bronco
2021-2024 2.7L V6 EcoBoost
Ford Bronco Raptor
2022-2024 3.0L V6 EcoBoost
Ford Bronco Sport
2021-2024 1.5L I3 EcoBoost
Ford Bronco Sport
2021-2024 2.0L I4 EcoBoost
Ford Crown Victoria
1998-2011 4.6L V8 Modular 2V
Ford E-150
1997-2014 4.6L V8 Triton
Ford E-150
1997-2014 5.4L V8 Triton
Common Questions
What does code P3623 mean on a 2002-2005 Ford Explorer?
P3623 stands for "Cylinder Deactivation Lifter Stuck Activated". A cylinder deactivation lifter is mechanically stuck in the deactivated (collapsed) position. The affected cylinder is not firing.
What are the symptoms of P3623 on a Ford Explorer?
Common symptoms of P3623 include: Check Engine Light, Engine misfire, Rough idle and vibration, Reduced power, Exhaust smell of unburned fuel, Catalytic converter damage risk.
What causes P3623 on a 2002-2005 Ford Explorer?
Common causes of P3623 include: Collapsed lifter mechanism, Oil sludge jamming lifter, Lifter roller bearing failure, Oil pressure loss to lifter, Excessive wear on lifter body.