Can a committee reject thesis after approving it Is it possible that thesis committee first signs off on a thesis and later discovers some weakness (not plagiarism or academic dishonesty, but weak sections or incomplete tables) and rejects it. I am talking about US and time gap may be a couple of years. The defects found in the thesis do not invalidate the main idea, but are more related to incomplete references and data tables.
There's no way to give a definitive answer without knowing your specific university's policies, but here's how it works in general:

If the degree has not yet been awarded, then the approval can presumably be reversed fairly easily.

If the degree has already been awarded, it can still be revoked if the university decides it should never have been awarded in the first place, but this would be rather dramatic.  It's not going to happen unless something is terribly wrong with the thesis.  In particular, you don't need to worry about this unless the problems are much worse than you have portrayed them as being.