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Donald Yoakem

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  1. Donald Yoakem
    I spoke with GMC customer assistance. She checked with Svc. Engineering who stated that they were aware of the extended crank time after the ECM has been flashed and that they are working on a resolution for another flash update. We are to stay in contact with the dealership Sbc Dept. For the next update. No time line given. At the dealer today and they will check for a revised flash. DY
  2. Donald Yoakem
    I also had mine refreshed and have also noticed a longer crank time. However on the eco start stop - it restarts as normal without the longer initial crank time. I personally do not like the additional crank revolutions / time and would also like to know what the flash updates changed.
  3. Donald Yoakem
    At the dealership today - Serv. Mgr. Found an Oct. 21, Svc Bulletin to update the ECM. They are doing this today and I will keep you all updated on the success
  4. Donald Yoakem
    I have a 2021 Denali 1500 - at approx. 5000 miles the DEF guage showed 1 bar above empty. I added 2.5 gal. ( box). T he guage then read I bar above half. Now the guage is going goofy and will read 1 bar below full and the sometimes 1 bar above half and today is stuck at 1 bar below full - dealer has never heard of this - any Ideas??
  5. Donald Yoakem
    I have a 2021 GMC 1500 Denali with 5500 miles. I hav e had the same issue 5x. Does not set a code and always starts on the 2nd try. No one seems to know anything amd said they have not heard of the issue. I believe its a software issue that needs to be resolved and not mechanical issue. Hopefully GM will figure it out
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