4wd light flashes but no 4wd
I have a 2000 s10 blazer with 4wd auto 2hi 4hi 4lo light is flashing but 4wd won't engage mechanic said there was no communication at the tcm and it could be the body control module or the transfer case module . I replaced the tcm (used part) no change. Any ideas before i replace the bcm any.
Need 4wd before the winter thanks