Cylinder Deactivation System Oil Pressure Low
2002-2009 GMC Envoy 4.2L I6 🇩🇪
Description
The oil pressure dedicated to the cylinder deactivation system is below the minimum threshold for reliable lifter switching.
Symptoms
- Check Engine Light
- Cylinder deactivation disabled
- Engine noise during attempted deactivation
- Lifter tick on deactivation command
- Oil pressure warning at idle
Common Causes
- Low engine oil level
- Oil pump wear reducing pressure
- Wrong oil viscosity installed
- VLOM assembly internal leak
- Clogged oil filter restricting flow
Diagnostic Steps
- Check engine oil level and condition
- Measure oil pressure at deactivation gallery
- Verify correct oil viscosity
- Test VLOM assembly seal integrity
- Inspect oil filter for restriction
Repair Notes
Top off or change engine oil with correct AFM-compatible specification. Replace oil pump if pressure is low at all speeds. Replace VLOM if internal leak found.
Related Codes
Other Powertrain Codes
- 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
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P3624 on Other Vehicles
Common Questions
What does code P3624 mean on a 2002-2009 GMC Envoy?
P3624 stands for "Cylinder Deactivation System Oil Pressure Low". The oil pressure dedicated to the cylinder deactivation system is below the minimum threshold for reliable lifter switching.
What are the symptoms of P3624 on a GMC Envoy?
Common symptoms of P3624 include: Check Engine Light, Cylinder deactivation disabled, Engine noise during attempted deactivation, Lifter tick on deactivation command, Oil pressure warning at idle.
What causes P3624 on a 2002-2009 GMC Envoy?
Common causes of P3624 include: Low engine oil level, Oil pump wear reducing pressure, Wrong oil viscosity installed, VLOM assembly internal leak, Clogged oil filter restricting flow.