Visual/Physical Inspection

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2020 GMC Yukon XL, 2020 GMC Yukon, 2020 Chevrolet Tahoe, 2020 Chevrolet Suburban, and 2020 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which could affect the operation of the automatic level control suspension.
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Inspect for binding or damaged shock absorbers.