Circuit/System Testing
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Operate the vehicle within the conditions of the customer's concern while monitoring the scan tool parameter or tool: Scan Tool
- Verify the scan tool parameter: Cylinder Deactivation Inhibit = No
- If not the specified state
Refer to the appropriate diagnostic procedure listed below:
- Symptoms - Engine Controls
- Symptoms - Engine Cooling
- Symptoms - Wiring Systems
- Symptoms - Engine Mechanical
- Go to next step: If the specified state
- If not the specified state
- Test or replace the component: Q83 Valve Lifter Oil Solenoid Valve
WARNING:
Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.