My 2015 Denali was riding poorly with the magnetic ride when I got it CPO. I found the right front shock was leaking. Following the repair, its been much better, so it may have been throwing off the computer.
I had a similar dead battery issue on my '15 Denali at the grocery store, that I bought CPO and had owned for ~11 months. One slow start, then after that nothing, the battery had completely died, had to manually unlock the door etc... I brought my Range Rover over to give it a jump with my...
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