Both back brake light work inconsistantly. While moving and at a complete stop. Local dealership charges at min 1200 per light to fix. Seems to be a common problem with the Denali's.

- Lafayette, LA, USA

Both breaklights no longer work due to faulty electrical panel.

- Gilmer, TX, USA

We bought our 2015 Denali 1 year ago and have approx 50,000 miles and the passengers side tail light is out. After researching taillight problems for my make and model this seems to be a very common issue. This should be considered as a recall but when looked into, I see it is not. Its a shame to spend so much money on a vehicle to have the tail light out at 3 years (after factory warranty is already out) and you have to replace the whole tail light instead of one piece.

- Savannah, TN, USA

Both led brake lights have failed. If you tap them they wok for a minute but when driving they go out again. The seat vibrates to alert you of obstacles but the motor in the seat only work periodically. The rear window wiper has failed. The Yukon has been driven 3 years and 50K mi and now needs thousands of dollars in repairs because of the defective parts used.

- Syracuse, UT, USA

Right brake light is out

- Collins, MS, USA

Rear taillights have moisture in them. The moisture is constant in one and intermittent in the other. Both have been replaced once by dealer 3 months ago. Problem still exists

- Hessel, MI, USA