We had just had our 2014 Prius V wagon serviced (30k logbook service) and then the very same day the following happened: We're driving along the freeway at around 80kph (50 mph) and we get a really strong vibration that feels like a blown tyre. Managed to (only just) pull over and after checking the tyres and checking the wheel nuts - nothing amiss. We carried on but then it cut in again - at around 70 kph (~45 mph). The vibration is felt the the steering wheel AND then through the whole body of the car as it progresses (passengers thought the wheels were going to drop off the car!). When slowing down the vibration continues but reduces in frequency (not in intensity) until around 10 kph (6 mph) it stops and the car then runs smoothly at normal town speeds (below 60 kph (30 mph)). This has me completely baffled. I have checked the dealer's invoice and all they did (apparently) was to rotate the rims and balance the front wheels. Any suggestions would be welcomed!
Hopefully they rotated the tires with the rims. I would immediately take it back to dealer and have them pull all the wheels and inspect. It seems logical that something is wrong with the tires or mounting. Perhaps they messed up the balance on one of the tires. Possible tire damage with a sidewall separation or bubble? Could have damaged a CV joint somehow or an axle, but that's unlikely. If you can't get to the dealer, go to any tire store and have them check your tires because some of these problems could be dangerous.
Wheel rotation mount would be suspect based on the major vibration you report. (Rim not flush to hub) Secondary could be wheel weights. (One fell off, yet that would not be such a violent vibration as described IMO.) Possible, there is another failure unrelated to there working on the car. (Murphy's Law failure just happened at the same time/ coincidence..could be anything in suspension or drive train even a motor mount) Easiest...return to dealer. Or... jack the car up yourself remove all the wheels and have a look. Good luck.
Even car could have slipped on the lift damaging a suspension component. Get it looked at, good luck.
They rotated yours tires and didnt balance them, and if they did balance them they did a horrible job (not setting machine correctly etc). Bad or no balance reveals its self at those speeds. Bring it back and tell them the balance on the front tires are way off.