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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?
Hi. My 2020 just developed the same issue a week ago. Took it in for servicing, dealer replaced one of the parts they had in stock and the warnings all disappeared shortly after that (but not right away, I actually drove it for about 50km and made 2 stops before the warnings stopped). Then, 2 days ago, the same warnings came up. Do you know if it will actually go into limp mode like it’s warning? I’m told it could take months to get replacement parts. I can’t believe that I might have to park an almost $100k vehicle for an indefinite length of time because of this.
There should be a bulletin stating to reprogram the reductant control module that will lower the voltage supplied to the connector so those pins don’t get overheated again.