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    Brake Fluid Flush

    Hello all. My wife just took our 2018 Yukon XL Denali into the dealership for an oil change. They told her it needs a brake fluid flush. I'm out of town for work, will be back in two weeks. I am mechanically capable, built a few older cars from the frame up, but haven't worked on the newer...
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    Trailer Towing Question

    I tow a car trailer with my jeep on it a few times a year. Use it to drag home junk cars once in a while. Tow vehicle is our 2018 Yukon XL Denali, that has Arnott air bags on the back with the mag ride delete dummy sensors. On the last trip I didn't bother to pull the ramps to unload, and the...
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    Arnott AS-3429 Failure

    SO.... I installed a pair of Arnott AS-3429 shocks on the back of the wife's Yukon XL just about 2 years ago. She told me the other day the truck was real bouncy in the back. Both top hats of the shocks have come loose from the shock shaft, threads are fine just unthreaded. Driver's side...
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    Spark Plugs for 6.2L

    I've wrenched on my own cars for years now. The Yukon is due for plugs and wires. Any common pitfalls to avoid? Any tricks to make the job simpler? Considering the dealership wants $600 for the job, I imagine it must be a PITA.
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    Need New TPMS Sensors

    I have a 2018 Yukon XL Denali. The battery died on one of the tire pressure sensors. I am looking to purchase a set of new sensors and install them myself, as the dealership wants $250 PER WHEEL! I am looking for recommendations on a good sensor. I see Rock Auto has genuine GM sensors for...
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    Air Shocks not Pumping Up?

    I have a 2018 Yukon XL Denali with the MagRide / air shocks in back. I swapped in a set of ARNOTT AS3429 to delete the MagRide but retain the air shocks to level the truck out when towing. Swapped the shocks in July of last year. I have towed since installing them and the truck leveled out...
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    Breaking the Bead on a 22"

    So... I have a 2018 Yukon XL Denali with the 22" chrome snowflake wheels. I picked up a set of 20" OEM wheels off a 2022 Sierra. The previous owner of the 20" wheels had a tire shop break the outer bead and pull his sensors. This got me thinking, as I am a cheapskate... I could do the same...
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    Looking to Buy New Battery Cables

    Finally back in town to put a new battery in the wife's 2018 Yukon XL Denali. Was thinking it might be a good idea to replace the cables while I'm at it. It is my understanding the negative cable can cause weird electrical gremlins as it degrades. I looked on GM Parts Direct and can't figure...
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    Battery Replacement a Professional Job?!

    I have a 2018 Yukon XL Denali. Wife took it in for a leaking tire. They tested her battery while they had the car - curtesy check. They said it is a bit weak. I went on to Advance Auto's site to price a replacement, and they have it listed as a 'professional only' job. I've torn a few older...
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    P0700 and U0100

    Wife called me, said truck won’t start. She waited a bit, it started in limp mode. She drove short distance and parked it, unsure if she should proceed. I drove to vehicle (2hours later) and pulled codes P0700 and U0100. Started truck just fine. Truck drives good. CEL is illuminated. I did a...
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    Looks Like I Need New Rear Shocks

    I have a 2018 Yukon XL Denali. It appears the rear shocks are worn out. I say that because there is an audible leak from the driver side rear shock that I can run my finger over and feel. I know the truck has mag ride. I assume the rears are mag ride also? I looked them up on...
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    2018 Denali/Towing Car Trailer

    I have a 2018 Yukon XL Denali with the tow package. I plan to tow a 1990 Jeep Cherokee (XJ) on a home built car trailer. This trip will be ~600 miles one way. I have done minimal towing, none with this truck. I have read a distributive hitch would be a good investment. Looking for advice on...
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    Delete AFM

    I have a 2018 Yukon XL Denali with the 6.2l. I recently purchased it and am new to the platform. I have read the AFM system is problematic and is best to delete it. There is nothing wrong with the vehicle currently. Can I get one of those tuners that turns it off and call it good? Or do I...
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    Groan Sound

    When backing out of the driveway. When the front axle hits the dip between the concrete drive and the asphalt street. The wheel is turned hard passenger. One out of 4 times (or so) there is a groan sound from the passenger front corner of the vehicle. Any ideas? I haven't crawled under it...
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    Hello All

    New member here. Just bought a 2018 Yukon XL Denali yesterday. I found this forum while researching the vehicle. Thanks for gathering all of this knowledge in one place. This is the newest GM I have owned, last one was a 2002 Z28 and the one before that was a 1979 Camaro. Looking for a list...

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