Every time my 2010 prius goes over a dip in the road while braking, the car seems to accelerate or "lunge forward." it has happened since I purchased the car in may 2009. I have not asked the dealership about the issue.
2010 Toyota Prius transmission complaints
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Sudden acceleration loss of braking while driving over bumpy road at slow speed. This has happened several times. No accident resulted. Having read reports of this in the news, I wanted to report it as well.
My 2010 toyota prius seems to have brief periods of acceleration when I take my foot off the accelerator and am just putting it on the brake. I have to brake hard to keep it from lurching forward.
I am also an owner of a 2010 prius. I have driven this car since august 2010. When you go over a bump when braking there is a sudden burst of acceleration. It absolutely happens and is reproducible. I go over the same bump every day on my commute home, and this happens repeatedly. It has never caused an accident, but it is a defect and is disconcerting. Given the other acceleration problems toyotas have experienced, this needs to be investigated.
I have a 2010 prius and saw an article about there being possible brake problems with the model. I have had this problem probably about 6 times since I got the car last july and, when I mentioned it to the dealer, they said there wasn't anything wrong with the brakes when they ran the diagnostic. When it happens, I'm in the process of braking, and there's a "push", almost like the brakes didn't "take", followed by a loss of steering for a second or two. It's also happened to my husband one time. There doesn't seem to be any rhyme or reason as to when it happens (wet road vs. Dry road, turning or going straight, flat or hill). I originally associated the problem with the brakes because I also have the "sliding" icon come on the dashboard when I'm completely stopped and lean forward in my seatbelt. However, I'm now wondering if it's not the brakes, but the transmission, since it sort of feels like it's not downshifting when it's supposed to, or it shifts back into a higher gear for a second while braking. I came to this conclusion after waiting in the car while it was running. With the car on, emergency brake on, but not in park, there was a definite "jolt" when the gas engine would turn on and then off again a few minutes later. Although there hasn't been a crash yet, there were two times when it came really close to that, as I was turning and almost hit the cars on the side street that were in the left turn lane waiting to turn onto the street I had been traveling on.
While braking at a speed of about 25 MPH, wheels hit a pothole and the car seemed to accelerate and lurch forward for a fraction of a second before braking resumed.
I own a 2010 prius with approximately 8,400 miles on it. I have only recently began to experience problems that have been reported before by others. When driving over some extremely rough spots, the car accelerates by itself. It feels like the brake pedal becomes an accelerator. My experience is that it only lasts about 2 or 3 seconds but is very obvious. Also, I would like to say that I have owned a sienna, camry, avalon and a 2005 prius prior to purchasing my present 2010 prius. This 2010 prius has more squeaks, rattles and stress noises than all of my other toyota products combined. For the last 13 years, I have driven only toyota's ., but have become disillusioned with this car. The road noise is excessive and the mpg shown on the display shows 2-3 mpg more than actual mpg. If I could trade this car in for near the amount I paid for it. I would do it tomorrow. Though it is only my opinion, I feel that the quality of toyota products has decreased dramatically during recent years. This is also supported by the excessive number of recalls during recent years.
2010 toyota prius with 2500 miles. Since purchased on 8/2009, I had more than ten experiences of unexpected acceleration (sudden unintended acceleration) on reverse that feel like two or three time (stronger) faster than normal reverse. Accompany the higher speed reverse, a heavy, abrupt braking with a slight touch of the brake during this event. The big "jerk" (braking) rock the entire car and banged heads again the headrests.this only happened with electric mode and most time with the car parked a slight incline. This unintended acceleration sometime happen a few time a day or it can go two, three weeks without any problem. The dealer can not find anything wrong with my car. And toyota have no information about this problem. However, if you go to priuschat forum under gen iii 2010 prius main forum-braking in reverse, there are many people with the same problems. I strongly believe this is very dangerous if a new driver get in my car and not know about it. There is one post in priuschat forum that best explain the problem: just yesterday, my prius-iii backed up with sudden unintended acceleration, with my foot only on the brake pedal.... I recognized what was happening because it happened once before, just over 2 months ago. Just a few days after I got the car. When I was backing out of an inclined driveway... I suspect that some unusual element of the timing of turning the car on and shifting into reverse, and possibly the internal state of the computer and the hybrid power system combine to produce this "abrupt" reverse acceleration as I am gently easing off my foot pressure on the brake pedal... The abrupt braking effect does occur, but only in response to the much more dangerous "unexpected, unintended" reverse power (acceleration), to stop the car motion. No matter how gently the brake is eased further on to stop, the stop is "abrupt" by garygid orange county, ca. I am trying to work with toyota on this issue. Thank you.
On three occasions, while driving on clean, dry road surfaces, my 2010 prius suddenly and briefly accelerated without any warning after I drove over minor bumps and, one 1 occasion, a manhole cover, while braking. The sensation was that of the engine suddenly surging and accelerating. I was fortunately able to apply harder pressure to the brake pedal, regained control of the vehicle and avoided crashing into the car in front of me. I spoke with a toyota field technical specialist today who told me that the mechanics of the car are such that if a wheel hits a bump or moves onto a surface that causes it to rotate at a different rate versus the other wheels, the car thinks it is going into a skid, and the ABS system kicks in. Also, the system that generates energy to recharge the battery, which also effectively brakes the car, suddenly ceases to operate. Consequently, you have the sensation of acceleration when in fact, according to the toyota specialist, the car stopped decelerating. Nonetheless, this sudden deceleration is unexpected, and if I was not focused at those exact moments and failed to immediately apply significant pressure to the brake pedal, I could have easily crashed into an object, or car, or person, in front of me. I do not feel safe in this car, and am worried that my wife or son could have a major problem responding to this sudden lack of control. There is great potential for serious injury or death from this type of incident. My car is about 1 month old, with 1,250 miles on it. I understand from the specialist that toyota dealerships on long island have had at least one other similar complaint.
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