I have toyota prius v 2015 but i was losing power and i took it mechanic several times and now it's seems like now it affected my engine or my gasket according to the mechanics.
Prius v3 lunging backwards 1/21/2016 on thursday 1/21/2016, i was parked in a big lot and after my appointment, got in the car and turned it on. but rather than pull backwards out of the spot, i decided to first make a call using bluetooth. the call took about 10 minutes. i then hung up, released the emergency brake, and moved the stick shift into reverse with my foot, of course, on the regular brake. as i released that brake, the car lunged hard about 10 feet backward across the parking lot "drive", into where other cars could have been parked but luckily weren't. i automatically and immediately put my foot back on the brake which stopped the car. needless to say, i was bewildered and scared by what had happened, counting myself very lucky there was no other car parked behind me. i don't know what caused the engine's lunge, i just know that i have driven toyota prius cars for the last 15 years, love them, and never had any driving issues. in researching the problem online, i saw that it might have been the car's power train, since similar lunges were described in cars a couple of years ago.