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Originally Posted by FirstJimmy
My 1999 Jimmy was acting like it was hesitating when I took off from a stop. My neighbor works for a dealer and diagnosed the problem for me with the help of some Tech II gaget. It appears that the Transfer Case Control Module was signalling the transmission that it was in 4LO and thus was shifting from 1st to 4th gear before I reached 35MPH. This made it feel like the engine was missing. I bought a use salvage yard module for $100(vs the dealer price of $380) and so far it seem to be working.
Does anyone know if this is a common problem? I called GM Parts line and was told these were on back order and most salvage yards seemed to not be able to keep them in stock!
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I was having the same trouble. The GM dealer diagnosed the problem as a bad Transfer Case Control Module and wanted $700 to fix it. I went to a salvage yard and got the part for $75. I hooked the new Control Module up and when I started the Jimmy the "Service 4X4" light came on. Did you have to do any reprogramming of the new controller or did you just hook up the wiring harnesses?