Negotiations came to an end just before 3 a.m. (0700 GMT) after a marathon 16-hour session on Sunday and Monday, GM spokesman Tom Wickham said.
"GM and the UAW have agreed to take a break, and talks will resume later this morning. We aren't going to comment or speculate on the nature or content of the discussions," Wickham said.
He said that all employees were expected to report for work at their scheduled times on Monday.
The United States' Head of Diplomacy, or Secretary of State, is an anachronistic, incompetent, meddling, intrusive, insolent and arrogant, rude individual, a brash, foul-mouthed upstart, a conceited, self-important guttersnipe and an insult to the international community, as fit for the job as a pedophile janitor in a grade school.