The inside and outside door handles are prone to breaking.Google+
Car Problem Reports
GMC Yukon Denali Inside/Outside Door Handles May Break
GMC Yukon Denali Problem
Average Mileage: 132,333 mi (58,000 mi - 200,000 mi)
Visitor, 2000 GMC Yukon Denali, 200,000 mi
Interior driver door handle broke off. I replaced it myself with a kit from ebay.
My outer drivers door handle broke and I waited as long as possible to get this fixed. It costed about $120.00 and than about 1 wk later after I got it fixed the inside drivers door handle broke. This costed me $350.00!!! Absolutely ridiculous!!
Visitor, 1999 GMC Yukon Denali, 146,000 mi
both inside door handles are broke in the rear doors
Visitor, 2011 GMC Yukon Denali, 60,000 mi
outside passenger door handle is broken!
Visitor, 2000 GMC Yukon Denali, 165,000 mi
inside door handle broke
Visitor, 1999 GMC Yukon Denali
Driver side and rear door
Visitor, 1999 GMC Yukon Denali, 115,000 mi
Inside passenger handle broke, replaced with new and better reproduction. Cheap and easy repair.
Visitor, 2007 GMC Yukon Denali
I have had to replace the exterior driver side door handle twice now once at about 70,000 and again at around 120,000 miles. I would highly recommend buying a replacement part online/eBay and install yourself or bring to local mechanic shop. Overall it will cost you a quarter-half as much as you would at GMC dealership.
Visitor, 2007 GMC Yukon Denali, 78,000 mi
door handles break
Visitor, 2007 GMC Yukon Denali, 100,000 mi
Outside door handles break loose from inside support bolts. Not fixed yet.