NHTSA Complaint #11621599 — 2016 GMC SIERRA 1500

i began getting a service engine light that went on and off a few times randomly. the vehicle would not switch down to 4cylinder as designed. there was an odd shudder as the vehicle slowed at 10mph increments which would randomly happen or not happen dependent upon the moment. i was outside of warranty so i went to a shop which has been very good in the past as opposed to risking dealership costs on top of the fact the dealership had no availability for quite some time. ultimately, i ended up replacing all fuel injectors and related equipment at my own expense. just happened to be online looking around after the announcement of gm reimbursing for similar issues on larger sierra engine and ran across a bulletin that only went to certain states in order to replace these injectors as they failed or reimburse for costs up to 10 years or 150000 miles from the time they were put into service. just curious as to why this happened in some states and not others when there was obviously and issue. i know this is probably not the forum, but a complaint is a complaint.