I have a 2020 GMC 2500HD AT4, and am having all kinds of the same issues my steering is really noisy and lots if rattles and vibrations dealership says its normal, but I disagree. Steering column pop up is also coming on, anyone have any new news on this or fixes? the put a new power steering pump on but still didn't help and a new steering shaft below the steering wheel which was already worn out after 10k they said.
Sounds like bad news for these new trucks.