I recently wrote a letter to the CEO of General Motors Because no one has a clue what’s going on I called GM customer service and they referred me to the dealer the dealer referred me to GM and on and on I went. Well 2 weeks ago to my surprise I got a response from the CEO’s office and here was the response the chips for retrofit should start rolling out my concern was I have everything heated wheel heated seats etc. but do not have rear park assist even though the sensors are in the bumper with that said I was told by the end of the year I would have the chip. GM is sending out letters to everyone who needs chips if your truck was built or your car was built with the items then you will receive a letter when the feature can be activated.