I bought a 2020 diesel Silverado High Country in May and there was an issue immediately with a loud clunking noise when the truck coasted. The first time I took it in, nothing was found but some computer adjustments were done. The clunking noise became worse so I took it back in again; they heard the clunking noise and made another adjustment, knowing that it probably would not solve the problem and they were right. The third time I took it back my truck was taken to another Cappellino dealership and the problem was discovered, related to a service bulletin from October 2019, which describes what was happening to my truck perfectly; Bulletin No:19-NA-216. I was not happy about having a problem of this significance on a brand new truck. Not necessarily the dealers fault, but it did take a long time to finally discover and fix the problem. The issue finally seems to be resolved.
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