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  1. G

    2025 yukon AT4 ultimate trans overheating at idle

    Yes my wife was sitting idling waiting to pick my son up and then sat in a drive thru for a while. We took a trip out to Palm Springs and got 31mpg. I understand the temps being high when it's 100 plus out, but the day this happened it was 82°F outside and she was idling. I'm still waiting to...
  2. G

    2025 yukon AT4 ultimate trans overheating at idle

    Thanks for the input and the comparable information, I really appreciate it. I contacted the dealer yesterday and the ecu had a U0102 code on it. "Lost Communication with Transfer Case Control Module" @genestoy those coolant and oil temps seem like they are on the very high end of normal limits.
  3. G

    2025 yukon AT4 ultimate trans overheating at idle

    It was at the dealer as of 6/16
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    2025 yukon AT4 ultimate trans overheating at idle

  5. G

    2025 yukon AT4 ultimate trans overheating at idle

    So as the title states we have a 2025 AT4 Ultimate with the diesel powertrain (LZ0) with 1800 miles on the odometer. My wife went to pick up my son from school the other day and had to wait about 10 to 15 min while idling with a ambient temperature in the 80s. Then drove about two miles to grab...

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