i have had 2 4t65e hd trannys go out of 2002 GTP.the only code present in PCM on both occasions was a p1571.could it be possible that the same thing was wrong with both transmissions,or is something else causing the transmission to go out.The last trans that went out somehow had water in it.what are some things that would cause that?i found a used trans with 95k on it for 400 bucks and id just like to know before i buy it if something else is causing to them to fry.