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Greetings the frozen tundra of South Dakota. I mention the weather up front as I see others have experienced the issue I'm currently having. Posting up my issue to add to community knowledge. The truck: 2015 Sierra, 6.2, 8-speed, 4x4. Bought it used back in August, sitting on 125k. This is my first winter with the truck. Ambient air temps have been single digit or below zero for a week or so. Anticipating this, I set out to put a battery tender on the truck and plug in the block heater. The other day I hit the remote start to warm it up before going to town to run errands, got ready and went out to find it not running. Got in, used the key and one click, no crank. After several hours charging the battery, it started right up. Next day same thing. Next day got stranded a few miles from home. No low battery warning, all the gauges read normal, no check engine light. Tried to jump it and eventually it started right back up. Since then, only the one click. I do have tools and diag equipment and whatnot and there are a lot of checks I have not done yet. It's -25 outside and there is a couple inches of snow on the ground. I have done a couple of quick tests in the limited amount of time I've been outside messing with it. In an effort to get it started again so I could get it inside the barn and at least out of the snow (and close to the tools and a portable heater) I pulled the starter relay and shorted power to engage the starter. It only clicks once. That points me in the direction of the starter / starter circuit being the issue. Things I need to do: Get the multimeter out and check for voltage everywhere it should be. Get to the starter through the passenger front wheel well so I can check the ground under the A pillar and the heat shield protecting the starter motor. There is a TSB about voltage arcing to the heat shield so I need to check that. Thaw the starter motor. Maybe I can tape a shop vac hose to a heat gun and shove it in there to see if it is just jammed with ice. I don't want to buy a starter if my starter is just frozen. I don't want to go through the effort to pulling the starter to thaw it. Where ever this path takes me, I have to solve it. Can't have a truck that turns into a paper weight 6 weeks a year. I know most people won't ever experience this issue but that doesn't mean the root cause isn't present in your truck too. So I'm going to figure it out and keep a record of my findings here. Thanks.