2004 Chevrolet Silverado 1500 Q&A

2004 Chevrolet Silverado 1500 Question: I am having issues with my putting my truck into 4hi and 4low.

I have a 2004 chevy Silverado z71 with 116,000 mile on it. For some reason I am unable to put my truck into 4hi or 4low, but able to put my truck into auto and 2wd. -
Answer 1
SCAN 4X4 MODULE FOR CODES AND POST SO WE CAN ADV POSS BAD SWITCH OR ACTUATOR -