Overwhelming support from workers at parts depots and a joint-venture battery plant who will get the largest raises made up for "no" votes from 53 percent of employees at assembly, metal and propulsion plants.
The agreement passed by a margin of 55 percent to 45 percent, winning by nearly 3,300 votes out of more than 35,000 cast, according to a count posted by the UAW.
The UAW declined to immediately comment Thursday.
GM declined to comment until the union declares that the deal has been approved.
The deal received support from about 82 percent of workers at parts plants and distribution centers as well as 96 percent at the Ultium Cells battery plant in Ohio.