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Optional Information: 2003 Volkswagen Passat V6Already Tried: Nothing as of yet ... it just happened while driving
Does the odometer still work? Any check engine or other lights on?
The check engine light is one (came on before the speedometer stopped working).
You will need to get the car scanned for codes, Autozone will do it for free. At this point I suspect your vehicle speed sensor has failed, and the code will tell you. BUT, that vehicle has a fairly sophisticated computer network so there may be other problems blocking the speed sensor readings. A trip to a VW specialist or dealer may be in order.
20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness