2020 Sierra 2500 Denali HD - DEF Tank/Wiring Failures

[Cheryl Blair]

We bought our 2020 Sierra 2500 Denali HD Diesel Crew Cab in June 2020. It has had more visits to the dealership for issues than any vehicle should, from brake pads to steering column, however, the biggest issue was on 25 Jan 2021 when we had the vehicle fail with the Diesel Exhaust Fluid (DEF) tank electrical connectors with signs of burnt terminals/damages/melting and the DEF Emission Fluid tank which was repaired by the dealership. The dealership made note of Bulletin #21-NA-006. Since being repaired it is now again Jan 2022 and it appears the same failure/problem. I anyone aware of or experienced this same issue/failure?