The 2008 model year is one of the more reliable years for the GMC Yukon line including the Denali, as reported by automotive repair statistics website CarComplaints.com. While the Denali isn't tracked separately from other models, complaints about the Yukon in 2008 are lower than in most other model years.
The primary repair issue affecting 2008 Yukon trucks is a cracked dashboard, an issue that also plagued the preceding model year. Rarely, owners have reported problems with the brakes pulsating or shaking the vehicle during downhill descents. The 2008 model year's reliability is a considerable improvement in reliability over the 2007 model year, which was the worst model year for defects for the GMC Yukon overall.