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  1. M

    Very High Pitch Sound

    Recently, our ‘10 Yukon XL Denali started emitting a very high pitch tone (must be above 25khz because my wife and I can’t hear it, but our kids do). It coming from the inside not outside. As I said, my wife and I don’t hear it, but our kids immediately ask, “Ugh! What’s that sound!?” after...
  2. M

    Desperate for help with tahoe

    Ironically, just a couple weeks ago our 2010 GMC Yukon XL Denali had the same problem - Radio would come on, but wouldn't emit any sound, and the turn signal doesn't make any sound when activating (but they worked). I took it to a trusted mechanic to get his opinion, and he said the turn signal...
  3. M

    2011 cadillac escalade is possessed

    We have a 2010 GMC Yukon XL Denali with 6.2L AWD with almost 160K miles - a similar vehicle. We experienced many of the same problems about 25,000 miles ago, and in typical fashion, when I took it to the dealer, it wouldn't act up. I started to notice a pattern of when the systems you...
  4. M

    2010 Yukon XL Denali 6.2L - Occasional White Exhaust / Burns Oil - Causes?

    Thanks for your comment. I’ll check the plugs. Interestingly, when parked at home, the truck is on a slight decline. When parked at my wife’s work, it sits on a slight incline (guessing 5 degrees on both the decline and incline).
  5. M

    2010 Yukon XL Denali 6.2L - Occasional White Exhaust / Burns Oil - Causes?

    Our Yukon XL 6.2L engine (with about 150K miles) goes through 2 qts of oil every 4-6 weeks, and occasionally emits white exhaust. The strange things about our situation is: It hardly ever emits the white exhaust at home. It ONLY emits the white exhaust when my wife leaves work (at work) in...
  6. M

    2011 Electronic Gremlins?

    I have a 2010 Yukon XL Denali (150,000 miles) and had the exact same issues. Fortunately, I was able to replicate the problem with the dealership's Shop Foreman in the passenger seat. They found the problem. It turned out to be two things: 1) The battery terminal connectors needed to be...
  7. M

    Mysteriously using oil

    I have a 2010 GMC Yukon XL Denali with 146,000 miles. A couple thousand miles ago it started randomly emitting thick black smoke from the exhaust upon startup. I couldn't find any cause/effect to it...seemed totally random. 2,000 miles ago I got an oil change and they said it was about a...

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