2017 Buick Envision Power Train

Check engine light is on Turbo is failing, underboost code. Very unsafe on roadway due to unpredictable loss of power. The issue has been diagnosed through my local service center. I have not taken it to a dealership yet but will be next week. The issue occurred three weeks ago I believe

New tires placed. Oil change next day noted oil leak on differential due to gasket. Mechanic tried to obtain gasket but system told him because my VIN was below a certain number I would need a new differential. Additionally, gasket could not be obtained. Buick knew a problem existed and changed manufacturing, hence, VIN above that certain number has no problems. What all of us below that VIN number?

When I am accelerating at a faster pace, always at 40 mph, my vehicle will start to shake. I have tested it several times now getting onto the interstate, it becomes an issue on the "on ramp" because I have to release the acceleration pedal and then very slowly get up to speed which causes me to not be able to get close enough to the posted speed while on the interstate which in turn causes other drivers to either slow down or try to move in another lane. I took it to my local Buick dealership (Trecek Automotive of Portage) on 4/29/24. They charged me $172.68 for diagnostics which resulted in this: Test drove. Did not feel shaking at first. The harder the vehicle was accelerated, the worse the shaking got. Recommend replacing front CV axle shafts. Cost approx. $1300. At the same time, I had a leak in the left rear axle seal which luckily was under warranty and was replaced. My 2017 Buick Envision has only 56,000 miles on it.

WHEN DRIVING THE VEHICLE AND INCREASING SPEED, THE TRANSMISSION DOES NOT WANT TO SHIFT. THE RPM'S WILL LITERALLY REDLINE, IF I DO NOT LIFT MY FOOT OFF OF THE GAS QUICKLY, AND REPLACE IT BACK ON THE GAS - THIS REMINDS ME OF A MANUAL SHIFT, BUT THIS IS NOT A MANUAL TRANSMISSION. THE HESITATION IN SHIFTING GEARS HAS GOTTEN SO EXTREME THAT I WILL START TO SMELL A BURNING SMELL IF I DO NOT MANUALLY SHIFT THE TRANSMISSION VIA THE GAS PEDAL. THE CAR ONLY HAS 33,000 MILES, SO I'M SURE THAT THIS IS NOT JUST THE RESULT OF AN OLDER TRANSMISSION. THIS HAPPENS NEARLY EVERYTIME I ACCELERATE MY VEHICLE.