ses3553

I have a brand new 2019 High Country with repeated check engine light and what I suspect to be a transmission issue. At light acceleration there is a deep rumble/vibration that gets progressively louder the longer you drive. Seems to be in the 12-1500 rpm range at varying speeds. If you accelerate or release throttle all together it goes away. Service tech went for a ride with me and said it maybe the planetary gears. I said ok but it still doesn’t sound normal. Truck is month old and currently in the shop for the 4th time. This is after trading in my 2017 Denali that saw the shop 18 times in 2 years. It was so bad GM gave me an incentive to buy the next one - which is turning out to be a big POS too.