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  1. L

    21 Yukon XL Service TPMS System?

    I agree, it’s just one of the replies above told me to disconnect the positive. I am a telecom engineer and i got into that, originally, by being an emergency vehicle upfitter. The first thing we did when a car was about to get worked on was disconnect the negative terminal.
  2. L

    21 Yukon XL Service TPMS System?

    After much procrastination, i disconnected the negative terminal, because I couldn’t figure out how to lift the positive terminal off after loosening it. I let it sit a half hour, and after reconnecting the service TPMs popped up immediately and three of the four tires had no response the...
  3. L

    21 Yukon XL Service TPMS System?

    Is there a way to read the voltage of the sensors?
  4. L

    21 Yukon XL Service TPMS System?

    Two days ago the service TPMS message came up on my Yukon and the front tire pressures weren’t displayed any longer. Today I tried doing the TPMS relearn and I wasn’t able to get the front sensors to beep. After some driving around, the rears stopped reporting so all four tires aren’t showing...
  5. L

    Do any of the video on dash screen adapters work on these trucks?

    Mirroring the phone was what I was thinking. I don’t have data turned on for the car anymore, do you need that or can you hotspot it off your phone?
  6. L

    Do any of the video on dash screen adapters work on these trucks?

    I was wondering if any of the aftermarket adapters to supposedly allow you to watch video on the dash screen of a 21 Denali, actually work? Are there any other mods you can make for that? Also, is there a way to get rid of the ‘feature’ that keeps you safe by not allowing you to navigate file...
  7. L

    6.2 recall question?

    It’s a 21
  8. L

    CarPlay audio cutting out (revisited)

    My 21 Denali does this with the phone confected by wireless and I sporadically get the sd card removed message and the phone disconnects when it is plugged in, by either the port in the front of the console or under the armrest. Is there a fix for this yet?
  9. L

    6.2 recall question?

    Are all 6.2’s from 21+ getting looked at? I have received a postcard and letters from several law firms looking to represent me, but at my last oil change, I noticed that the dealer put 0w20 in, so I asked if my truck was under the recall inspection and oil spec change, and he punched my vin in...
  10. L

    Wheel speed sensor erratic?

    Well, I have an update. Dealer said that they think the hub is failing and generating debris, which is damaging the sensor. They want to replace the sensor i just changed and the hub. They gave me my car back while they order the parts.
  11. L

    Wheel speed sensor erratic?

    I’m kind of at a loss as to what I am looking at, not knowing the sampling rate, etc…
  12. L

    Wheel speed sensor erratic?

    Then a couple of minutes later, here’s the bad sensor again:
  13. L

    Wheel speed sensor erratic?

    Here’s the bad sensor:
  14. L

    Wheel speed sensor erratic?

    This first one is an example of what the graph looks like on a good sensor:
  15. L

    Wheel speed sensor erratic?

    I switched over to my cheap Bluetooth code reader because the sensor outputs seem to be in a format that I can read and all four wheel speeds seem to be mostly the same.
  16. L

    Wheel speed sensor erratic?

    Sorry, I forgot that, thanks! Edited the post with the correction.
  17. L

    Wheel speed sensor erratic?

    I have a 21 Yukon XL Denali. I’m getting a ESC warning lite coming up, and when I checked it, it seemed like the Driver side rear wheel speed sensor was bad, so I ordered the replacement harness with the sensors and replaced it. Sourcing that and replacing that was a real treat, none of the...
  18. L

    Where to look for leaks?

    I have a 21 Denali XL and I was vacuuming it out the other day and I found that the bottom side of the front floor mats were wet, so I pulled the sill trim and the padding was soaked and the plastic sills that guards the loom on the sides was wet, on both sides. Is there something obvious that...
  19. L

    Possible to upgrade a 21 Yukon XL to the brakes from the PPV

    Sorry if this is discussed elsewhere, I tried searching for it and I couldn’t find anything on it. I have a 2021 Yukon XL 4x4 and it’s getting to be time for brakes and I was wondering if it is possible to swap the brakes out for the ones from the Tahoe PPV? If so, is it complicated? Is...
  20. L

    CarPlay intermittently disconnects

    Hi All! I have a 21 Yukon XL Denali and a iPhone 12 Pro. I’ve just very recently been getting worse and worse amounts of disconnects and interruptions in my CarPlay connection. I normally have my phone plugged in via the usb cable. When I go through certain areas, it started out just south...
  21. L

    2021 USB ?

    Lately, I’ve noticed that my car play has been dropping out, so I’ve been driving around with my phone plugged in to the usb port, charges just fine. When I looked at the car play menu on the phone, I only see a single instance of the GMC, my understanding is that I should see two, one for the...
  22. L

    2021 USB ?

    I’ve tried formatting a stick with Fat 16 and it still isn’t recognized. Is there anything that I can try that should absolutely work? If the port’s data connection is dead, I’d like to get it fixed.
  23. L

    2021 USB ?

    I’ve tried the USB sticks that I was using in my 2015 Outback, I’m pretty sure that they are FAT 32 formatted, and they don’t seem to show up as a source. Is there anything that should absolutely work, so I can make sure that the ports are functional? If they don’t work, I’d like to know so I...
  24. L

    2021 USB ?

    Are you supposed to be able to use mp3 files on a usb stick?
  25. L

    2021 USB ?

    I have a new to me 2021 XL Denali, I was trying to connect an old school iPod or a usb flash drive with music to either of the usb ports and nothing seems to happen, neither shows up as a source when plugged in, but the iPod will charge. Is there someplace that you need to enable data ports or...

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