Here is the service manual definition for that bulletin. Mine starts at 18 mph and goes to about 23 mph with some steering input.
Involved Region or Country
Additional Options (RPOs)
Equipped with F46 and RPO LTG Engine
Some customers may comment on when mostly driving on a smooth road, a metallic gear type rattle can be heard when cruising between 72 to 85 km/h (45 and 53 mph).
This condition may be caused by the rear differential clutches turning off when the vehicle is in 6th gear and cruising at a steady rate of speed above 70 km/h (44 mph) for more than 10 seconds.
If the rattling noise has been validated to be caused by the condition listed, the Rear Differential Clutch Control Module (RDCCM) must be updated to the latest software calibrations available.
2016 Envision Prem ll