Wipers stay on

My windshield wipers stay on after the switch is turned off. Could it be anything other than the stalk. I'd hate to spend $140.00 only to find out it was not the problem. Thanks in advance for any help.
Greg

What year?
There is a wiper control board attached to the wiper motor. about $25.easy to replace.
three screws I think.

I have the same problem with my 2003 Yukon. Dealer was stumped. Is the answer really something as simple as a wiper control board? Would a replacement board be easy to find and install? Thanks in advance.

My cure was a shield wiper motor board. GM part #88958136 available from GM parts direct for $77.27. Good Luck
\Greg