I had this exact issue with my ‘21 XL Denali. Sounded like a supercharger whine. Dealer replaced a transmission cover in the transmission. It took 28 days to get the parts and complete but that’s another story.
The Retrofit Source answered my HID question, no one care to chime in on the LED question?
I only ask because I saw a post about there being an early 2015 version and a late 2015 version.
I've seen a few different recommendations as to what bulb is required to replace the fog bulb with an LED bulb. Can someone clarify this for me?
Is this it?
http://www.vleds.com/10-led-drl-fog-light-bulbs-p13w-1-pair.html
Also if I order an HID kit from the Retrofit source do I need a canbus...
Had the exact same issue. I identified it was only happening when warm. Took the dealer 2 days to fix as they were waiting on details from GM engineering.
+1 for the "premium ride". First yukon with air suspension helpers and the truck rides GREAT. No longer have the super springy-ness with more than 2 people or a heavy load in the truck.
It does pop up out of the dash but doesn't work in that position. It pops up and exposes a large pocket behind that contains a USB port (that is lit up by an led).
Thanks for the info!
On a side note I have a set of retrofits done by a member here that I can get rid of now. Pm me if anyone is interested.
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I'll snag some pics tomorrow in the daylight.
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