when I bought mine, the VX would drive ok, no check engine.. but the indicater for the tod pulsated, and the tod would ingage locked for like a second.. it was a continuous cycle happening every second almost. Anyway, I had warrenty, kempt bringing it it.. finally got the transfercase replaced/ They kept changing everything else too in the other visits. I believe it because who ever used it before me, never changed the tires.. Make sure there's a good amount of tread on the tires, and the tire pressure is equal in all tires.. I run at 29 psi.