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.
Yukon XL 2500
Average mileage: 119,450 (71,000–175,000)
12 people reported this problem
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When putting on left or right turn signal the 4 way flashers will come on.
turn signal makes clicking noise when signals are off.repair estimate $200.00
clicking noise stays on after you've completed your turns. no flashing signals, just continuous clicking noise. happens either direction, and comes on even when directional signal was not used, just simply driving.