The windshield wipers may not work intermittently due to a faulty wiper motor control board. Our technicians tell us that lightly taping on the wiper motor when the fault occurs should temporarily get the wipers working again. Some vehicles were recalled for this problem and some were not. You will need to check with your local dealer to find out if a specific vehicle was included.Google+
Car Problem Reports
GMC Yukon Windshield Wipers May Fail Due to Faulty Wiper Motor Control Board
GMC Yukon Problem
Average Mileage: 100,000 mi (98,000 mi - 102,000 mi)
Visitor, 1997 GMC Yukon, 102,000 mi
Intermittents wipers would not run (wipers either ran or not). Replaced control board
Visitor, 1999 GMC Yukon, 98,000 mi
Pressed/moved plug to control board. No permanent fix yet.
Visitor, 1999 GMC Yukon
Wipers work when they want. When they do work sometimes they just stop and won't start again. Almost hit someone walking because it was dark and rain was pouring. Had pulled over twice trying to get them to work.