I have 2016 gmc terrain with about 80000 miles now. I'm having module problems. December of 2021 abs control module goes out gets fixed. 1 week later onstar control module goes out it took them almost 2 months to figure that one out and to get it fixed. Just last week my power of steering module goes out its in the process of getting fixed. Also when all of this happened it was heavy in rainy weather don't know if that matter or not thought I'll mention it.My question is why are all this modules going out? Is it normal? Is there a bigger problem that no has seen yet? Anyone else having this problem?

Check the alternator output.

Agree with carfixer007 ^^^^^^^

If the alternator is cooking everything, those modules would be some of the least resilient parts.