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    2021 GMC Sierra AT4 3.0 Duramax

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moobaru's Achievements


Enthusiast (2/11)



  1. Gotta love GM and their "Reliability" 6K miles... should not have all these issues with it.
  2. It only took 11 min for the update and they said the truck must be turned off during the update. I didn't notice the voltage being low at all after the update. I will check on that in the morning.
  3. I have a 2021 Sierra 1500 AT4 with the 3.0 Duramax. So I got a notification there was an update for my infotainment system today, it said release date was 9-13-2021 I don't recall the update number. I did the update. After the update I started the truck and it is idling very rough to the point that the truck is shaking, the service ABS light is now on, and the traction control is stuck in the off position. Has anyone else had this happen?
  4. First time I reported it to the dealer I purchased it from, they said "That's because it was cold outside" I said it was 85 outside when it happened. They basically just blew it off that I was dumb or something.
  5. My VIN starts with a 3, I believe that indicates Mexico IIRC. I have the long crank no start, and fuse box bolts way out of spec (not the issue evidently).
  6. I have had a few of the crank no-start issues. Mine shifting from 1st-2nd and 2nd-3rd the truck does jerk a bit, even when accelerating gently. The rest of the changes I can't feel them. I am not sure if this is what you consider harsh shifting or not.
  7. I'm not sure how closely related the issue Subaru had back around '13 (I'm not a mechanic, and I don't play one on TV), but this service bulletin talks about a extended crank and/or no start along with other items. They seemed to fix it with a shim too, so hopefully they are right about the shim. https://static.nhtsa.gov/odi/tsbs/2014/SB-10052498-5734.pdf
  8. Now we just have to wait X number of days/weeks/months to see if it happens again!
  9. This is my first domestic vehicle I have ever owned. I was debating between this (2021 1500 AT4) or the new Tundra. My boss was raving about how great GMCs are. I decided to take the plunge and got the AT4. Right now I am wishing I had waited for the new Tundra, depending on how long it takes for them to fix this I may or may not trade in my At4 when the new Tundra comes out.
  10. Not trying to answer for them, but I was a big cheerleader for the Fuse box bolts as after mine did it the first time I found mine way out of spec. I too re-torqued them a few weeks ago, they were loose. But after my truck did the crank-no start yesterday when I got home I pulled out the torque wrench and all 4 were still at 53 in-lb.
  11. Just had my second long crank no start , first one was at about 230 miles, this one was at 5690 miles. Second one I had run into a store for about 15-20 min like others have reported. But I had done this several times before with no issue.
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