Display alarm 4x4 in active and engine fail safe mode

you need to scan codes and post so we can poss help. this may need to go to a mech to repair,but post codes 1st and stop repl parts

I have the 4x4 light on only and took it to be scanned and no codes came up then the guy said he found a emergency trans code and said take to dealer and dealer wants $175.00 just to do the same thing. Which isn't right can you tell me what to do about this problem please.