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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    THANK YOU @SpareParts and @mikez71 and community! @mikez71 got me thinking about it not being a battery issue and more of throttle body/acc petal issue. @SpareParts got me to stop thinking about history codes and electrical issues. When I stopped focusing on electrical I believe I figured it...
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    And alternator tested good in all categories.
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Thank you for the information. Check engine light hasn’t come on one time since I’ve had it. The p0621 turns on battery light when koeo. When put different battery in, it didn’t. When scanned all systems, it showed clear in all. Had the battery tested again and napa said it is good as well...
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Yeah I’m confused on if these are codes from a long time ago or recent. They give no info about when they were logged. When I am in the section to choose live data, on board monitor, etc there’s component testing for like evap system that works on my other vehicles. Idk even what to do next. I...
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    I felt like it was the battery and put my deep cycle boat battery in it to just see what happened and the code went away. Also when I turned my headlamps off it seemed to go way up in voltage so I wonder if there’s an issue there? Like I said I had the battery tested at autozone and they said it...
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Got it, sorry about that.
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Sorry for the frustration with me running tests and responses, I have a 1 and 3 year old and work 12 hrs a day and also not an electrician. Just trying things suggested and hoping someone can point me in the right direction.
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Again, no check engine light. Also scanner says module not supported when trying to do component testing so it seems like ecm to me but idk anything about this stuff.
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    Also idk what these codes even are because they are not in history and current. They are in additional. Whatever that means
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

    okay sorry been super busy. Didn’t have time to take alternator off and test at autozone but did battery today and they said it’s perfect. Doing alternator test tomorrow. I tried running the simple test with the wires. I had 4.5 at alternator plug but couldn’t get the ecm connection off. Ended...
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    11 Yukon XL Denali Electrical Issue P0621 SOLVED

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