Question about 1999 Chevrolet Silverado 1500

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CompuG my chevy silverado z71 1999 the light of service 4x4 turn on and the 4x4 turn on by itself and got stuck .The transfer case motor,the computer module of 4x4 and the diferential actuator has already been replace and the light is still on. The computer says the ports A and B have problems. Please help the mechanics dont know what to do anymore. HELP!!!!

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Not positive but try cleaning out the sensor connections that run to the transfer case and the front diff. i have a 2004 and those were a problem with mine after cleaning them with electrical spray and tooth brush plug them back in and wrap electical tape around them to help keep moisture and dust out.

Posted on May 16, 2009

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There is a ground that goes to the firewall from the 4w/d computer that goes bad and the computer or the motor can't get the proper voltage/current to do the job they need to do it with. unfortunately some underdash work is required. just rewire the ground and recheck. I am in the process of making a manual system for those but may never see production. I live in NY and we see alot of these cause of salt on the roads.
Good luck -

Posted on Aug 31, 2008

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