The inside and outside door handles are prone to breaking.
Car Problem Reports
GMC Yukon Denali Inside/Outside Door Handles May Break
GMC Yukon Denali Problem
Average Mileage: 168,333 mi (145,000 mi - 200,000 mi)
Visitor, 1999 GMC Yukon Denali, 160,000 mi
Both back door handles (one inside, one outside)have broken twice. Now the inside drivers side door handle has broke....ridiculous!