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  1. D

    Mystery

    December 8th I was getting into my 2020 Sierra AT4 and I noticed all of the windows were down and the mirrors were unfolded. The truck is kept in my garage and the mirrors need to be folded to get in. It is also asking for my password to be able to connect devices but does not recognize my...
  2. D

    Block Heater

    Does anyone know the Part# for the power cord to plug in the block heater?
  3. D

    DEF Consumption

    I have 4000 miles on my AT4. I have towed my toyhauler 1300 miles. I have added 7.5gal of DEF. It really uses the DEF while towing.
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