At a glance
What can fail
Water can leak into the exterior tailgate switch, causing the power-locking tailgate to unlatch and open while parked. Unsecured cargo may fall onto the road when the truck is moving.
What the fix does
A GM dealership will replace the exterior tailgate switch. Inspect and confirm the tailgate is closed and latched before driving.
Summarized — see the official notice for exact wording, dates, and contacts.