Hi ,
I have GMC - Yukon 2015 , recently a message start appear intermittently ( driver assist system ) , once it appear the seat vibration don't work , however , sometime the car back to normal without any problem and message disappear , I had sent it to specialized technician although not error not exist while sending the cat , the technician informed me no error shows while connecting diagnosis system , please advice what to do , since next day morning the message appear again .
Best Regards ,
Hassan Hussain