GM Truck ABS Malfunction: Part 1 -Diagnosis

My neighbor brought over his 2014 GMC Sierra 2500HD because the dash was flashing warning messages. He said rodents might have caused some damage, since the truck sits on his farm most of the time. Let s take the diagnosis from scratch and find out why this truck is fussing about its ABS system! Launch X431 Diagun IV: http://bit.ly/2GvxGlM Launch Product list: http://bit.ly/2Dm1gYG Enjoy! Ivan