From Microsoft Copilot. It isn't always correct as it misread my VIN for options but usually correct. Says the VIN will confirm the lumbard module that the vehicle has:
Yes — on most modern GMC Sierra Denali models, the power lumbar support does move up and down as part of a 4‑way lumbar system. This means you can adjust
in/out (firmness) and
up/down (height) independently for better lower‑back positioning.
How Denali Lumbar Support Works
- 4‑way power lumbar is standard on Denali and Denali Ultimate trims.
- Adjustments include:
- Lumbar height (up/down)
- Lumbar depth (in/out)
- This is confirmed by GM parts listings describing the Denali lumbar module as a “4‑way position” unit.