Four wheel drive problems 1999 chevy suburban on 1999 Chevrolet Suburban 1500

I have replaced about everything that has to do with the four wheel drive on the suburban and it still want engage I don't know what I'm missing need help

by in Platte City, MO on March 21, 2013
2 answers 2 comments
ANSWER by on March 21, 2013
Scan test.
COMMENT by on March 22, 2013
I put a scanner on it and nothing came up. The service four wheel drive light is on but no codes.
COMMENT by on March 22, 2013
Did you select the propper test? Code reader or a SCANNER? If the light is on there are codes.
ANSWER by on March 22, 2013
agree with wetry but at this point you may want your mech to ast you in diag and poss repair
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