2015 Yukon XL passenger side brake light out.

GuruXWDFB if wires are melting then this means the wires are definitely grounding out and in your description it sounds like you have a loose wire especially if your saying its happening here and there, they want that much money because of tracking down the bad wire but if you have some knowledge of this grab a continuity test and wire test light and test the wire to the light and see where your at . Wire testing takes a lot of patience and time .. I've worked on cars for 40 years and still when it comes to wiring its not an easy thing to diagnose. But theres a sure way to test to see if you have a shorted wire , take the positive cable off the battery and use a wire test light connect one end to the positive on the battery and the other end to the positive wire you took off and if it lights up you definitely have a short somewhere at least that's a start .. good luck

It's the LED array - they're junk. It's not the wiring harness, fuses or melting wires. I recently got both my tail lights repaired for $278 at Yukontaillightrepair.com and they're back to normal now. Hardest part was getting to the post office. But GMC can fly a kite on the $753 they wanted for each OEM replacement - probably the same OEM crap.