I had to put a transmission in my 16 at 69k miles. Develop a shake at low rpm, attempted to drive it to the dealer but got so bad I had it towed in for service. Tech ended up replacing the hp fuel pump, injector, afm lifter, and a bent valve. Made it less than a mile and same issue showed up. Took it back only to be told i needed a transmission also. $2100 in engine repair and $4000 for a factory rebuilt transmission. GM did kick in a grand on the transmission luckily.