Unifor said details of the agreement will first be released to union members at a ratification meeting on Sept. 22.
The deal comes after the union and the carmaker extended a negotiation deadline that was originally set to expire on Tuesday.
Unifor Local 88 had previously said that 97% of its more-than-1,300 members were in favour of stopping work at the Ontario CAMI plant which makes electric vehicles and batteries, if a deal was not reached.
Unifor and GM started contract negotiations last week.
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