1999 Chevrolet Blazer Q&A

1999 Chevrolet Blazer Question: No third or fourth upshift by transmission after tcc module replacemet.

Had no communication with tcc module until replacement. Transmission downshifts upshifts one to two fine but goes into a neutral mode when you over 30mph.It does go into 4wd drive now. -
Answer 1
Whar are the codes? -