Trans won't change gear up or down drives only in drive gear but won't switch

What is your question?

Drove vehicle from Amityville long island to Philadelphia PA in one gear drive,,rev 6000 rpm without redlining. Won't switch gears up or down 3 hr. drive back to Philadelphia is it sensors or what. Start up fine everything works. No strange noises or sounds

What makes this problem better or worse?

Nothing

How long has your 2001 Mercedes-Benz S430 had this problem?

Since purchase last week