The official notice
Defect
On certain Silverado LD and Sierra LD models, the bed-cover could come loose while driving and detach from the truck. This problem affects tri-fold tonneau covers that were factory ordered or sold as an accessory. Note: This recall replaces Transport Canada recall 2019-205. Trucks that were repaired under that recall also require this repair.
Safety Risk
A tonneau cover that separates from a moving vehicle could create a hazard for other drivers and nearby people.
Remedy
General Motors will notify owners by mail and instruct you to take your truck to a dealer to replace the tonneau cover rails and clamps. They will also add a tether to prevent the tonneau cover from detaching. For trucks repaired under recall 2019-205, the dealer will confirm that the previous repair was performed correctly. Note: Until the recall repairs are completed, you can prevent the chance of the tonneau cover detaching by removing it from your truck and storing it.