A clicking noise may be noted from the turn signal flasher after the turn signals are switched off. This is commonly cause by a faulty turn signal switch which will require replacement.Google+
Car Problem Reports
GMC Yukon Denali Turn Signal Switch May Fail and Cause Clicking Noise
GMC Yukon Denali Problem
Average Mileage: 159,500 mi (126,000 mi - 190,000 mi)
Visitor, 2000 GMC Yukon Denali, 126,000 mi
The turn signal SOUND or NOISE is constantly will not stop. It is constantly on even though the turn signal is not in either left or right position.
Visitor, 1999 GMC Yukon Denali, 190,000 mi
Replaced turn signal switch
Visitor, 2002 GMC Yukon Denali, 157,000 mi
my multi function switch on the steering column needs to be replaced. can I do this myself? Or what is a fair price for the dealer to do it.
Visitor, 2001 GMC Yukon Denali, 165,000 mi
non- Denali, but same issue. turn signal clicking noise is constant, even though the turn signals are not on