4wheel drive works in 4 lo and 2 wheel drive but not 4hi or AWD , Why? on 2004 Chevrolet Trailblazer

No service 4 wd indicator comes on ,computer reflashed because of engine light and loss of engine power light coming on . Will occasionally go into 4 hi and AWD .lights do not come on in AWD or 4 Hi when switch is changed only on occasion seems like when it feels like changing .

by in Auburn, NY on January 11, 2013
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1 answer
ANSWER by , January 11, 2013
sacn for codes and test switch