really awful
Crashes / Fires:
33 / 1
Injuries / Deaths:
10 / 0
Average Mileage:
11,606 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2010 Toyota Prius engine problems

engine problem

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2010 Toyota Prius Owner Comments (Page 1 of 14)

problem #269

Jul 052017


  • 170,000 miles


I was driving on the freeway at about 70 mph when the "check hybrid system" light came on and the car lost all power and ability to accelerate. It completely began to descend in speed and within 2 minutes came to a complete shut down. I could have easily been rear ended had I not moved to the side of the freeway as quickly as I did.

- Palmdale, CA, USA

problem #268

Jan 152017


  • miles
I change the brake booster twice and hace the same problem. My brake pedal loss of braking ability or slipping brakes and the warning brake, ABS and traction light permanently on, and no cruise control works at all

- Accokeek, MD, USA

problem #267

Feb 112016


  • 53,000 miles
The contact owned a 2010 Toyota Prius. While parking the vehicle, it unexpectedly accelerated and struck another vehicle before crashing into an apartment unit. A police report was not filed and there were no injuries. The air bags did not deploy. The vehicle was towed to an independent mechanic, but the cause of the failure could not be determined. The manufacturer was called and provided the contact with an investigator who removed a box from the vehicle, which would determine if the failure was due to driver error or a safety defect. The manufacturer determined that it was driver error. The vehicle was not repaired. The failure mileage was approximately 53,000.

- Seattle, WA, USA

problem #266

Nov 262016

Prius 4-cyl

  • 60,000 miles


In the past year I have had 2 occurrences of unintended acceleration. The first in February of 2016. I was exiting a parking ramp up hill and stepping on the accelerator. I was driving straight then turning to the left (90 degree turn). When I took my foot off the accelerator, the car continued to accelerate and I was unable to get it slowed/stopped for about ½ a block even though I was applying heavy brake pressure. The car was revving against the brake pressure. No damage or injuries occurred. I took the car to the dealership where I purchased it (purchase date 8/3/13). They checked the car over and found no apparent cause for the acceleration. I took the car home, and it drove normally until 11/26/16. On that date I was driving very slowly in a flat parking lot, and the car began accelerating without my pushing the gas pedal. I was driving straight and then turning to the right (90 degree. I got the car stopped in a few feet by pressing extremely hard on the brake. My car did not hit anything. Technicians from the dealership have not been able to find a cause and I have not been able to get past Toyota's customer service department to escalate the issue for more detailed diagnostics. I have attached the timeline of trying to get the car diagnosed and the issue escalated as well as why I don¿T think user error is a factor.

- Minneapolis, MN, USA

problem #265

Jul 162016


  • 127,000 miles
I was in a parking structure going approximately 15 mph when I removed my foot from the accelerator to press the brake. Before I could get my foot to the brake, the car quickly accelerated. It took at least two attempts at pushing the brake peddle before the car came to a stop. And, to be honest, the guardrail the car hit helped actually stop the vehicle. It was totally unexpected and extremely scary. In hindsight, I should have suspected that there may be a problem when I noticed that sometimes when applying the brakes to come to a stop there would be a feeling of the brakes slipping and the car lurching forward a bit. The dealership had the car towed in to get checked out, and I have been told that they will notify Toyota. In the meantime I am concerned about the safety of this car!

- Champaign, IL, USA

problem #264

May 252016


  • 85,000 miles
On 05/25/2016 at about 9am, while in motion at a rate of speed approx 25 mph on a street during construction (don't know if the bumpy road had anything to do with it), the change oil soon light appeared and seconds later all the lights on the dash came on with the message to check the "check hybrid system". I tried to stop the vehicle and it kept accelerating. I pressed on the breaks really hard and the traction control light kept flashing on and off like crazy but it barely had any impact. Although the vehicle slowed, it did not come to a full stop. I ended up hitting the vehicle in front of me. Thank god it was a truck and as able to stop the car from moving further or I could of ended up in the middle of an intersection. After the collision, the car would not stop although the park button was pressed and light was on. I even tried turning off the vehicle and the vehicle stayed on and in drive. I ended up in the hospital and don't know how it eventually got turned off but that was very frightening. I had my children in the car. On impact, the seat belts did not even tighten.

- Henderson, NV, USA

problem #263

Feb 212016


  • 187,000 miles


Brake booster pump assembly vehicle in motion when on highway when loss of breaking and steering took place. Vehicle lighted icons appeared on dash along with alarm sound. (ABS) (!) (brake) (ss). This unsafe condition could have been avoided if NHTSA would have forced Toyota to recall this defective part in 2013 when Toyota notified NHTSA of the defective braking system. Or Toyota mailed notice to customers as stated back in 2013, which prevention could prevent loss of life or harm. Or class action. www-ODI.NHTSA.dot.gov/acms/cs/jaxrs/download/doc/ucm442011/rcmn-13V235-0909.pdf

- Ranson, WV, USA

problem #262

Feb 212016

Prius 4-cyl

  • 95,000 miles
My Prius suddenly accelerated today. My wife was not in an accident. My VIN is [xxx]. I spoke with my wife and the incident occurred up a hill when she was parking (decelerating), she didn't notice that the floor mat was not stuck at the time and there was no warning of a problem. Also, this has not happened before. Vehicle was going up a hill on a city street, no ice, going strait, no damage to the car, unknown to what failed. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).?

- Stillwater, MN, USA

problem #261

Jan 012011


  • 15,000 miles
The contact owns a 2010 Toyota Prius. The contact stated that while driving at 20 mph, the contact drove over a pothole and the vehicle veered to the right. In addition, the vehicle accelerated in excess. The failure recurred on numerous occasions. The vehicle was taken to a dealer, who was unable to diagnose or repair the vehicle. The manufacturer was notified of the failure. The contact was aware of NHTSA campaign number: 10V039000 (service brakes, air). The failure mileage was 15,000.

- Olney , MD, USA

problem #260

Apr 192015


  • 53,000 miles
The contact owns a 2010 Toyota Prius. While driving at approximately 20 mph and slowing down at a stop light, the vehicle accelerated without warning. The contact stated that the brake pedal was depressed to the floorboard while the rpms increased and the vehicle failed to stop. The vehicle eventually came to a stop. The vehicle was taken to the dealer but the failure was unable to be determined. The vehicle was not repaired. The contact mentioned that the failure was experienced in may of 2010 and the vehicle was repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 53,000.

- Terre Haute, IN, USA

problem #259

Jan 282015


  • 180,000 miles


The headlight hid start to go on and off finally the left side went off. Also while driving the car desacelerated and increased speed by itself.

- Campbell, CA, USA

problem #258

Feb 122015


  • 55 miles
Today Feb 12, 2015 at approximately 11:40 am a white sports car license plate [xxx] was dangerously weaving in and out of cars and could have caused a crash. Location was on redmond way 202 going towards the 520 highway going towards seattle. This person is a reckless driver, please keep an eye out for this car. Thank you. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Sammamish, WA, USA

problem #257

Jan 012014


  • 60,000 miles
The contact owns a 2010 Toyota Prius. The contact stated that while driving at low speeds over a bump or pothole, the vehicle would suddenly experience unintended acceleration. The contact mentioned that the failure occurred even when the brakes were engaged. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was 60,000.

- Decatur, GA, USA

problem #256

Nov 222014

Prius 4-cyl

  • 73,000 miles
I was going up the on ramp to I -75 exit 341 in Florida when I lost all power steering and braking and the check hybrid system light came on. Cars were coming at me at 70 mph and could have killed my wife and I. this is the second time I have reported the problem of check hybrid system light coming on and losing all power. This should be investigated a sap to prevent so eone from being killed.

- Westland, MI, USA

problem #255

Aug 302014

Prius 4-cyl

  • 132,000 miles
Accelerated to get on highway. Once on the highway the system hybrid warning light and other warning lights and audio alarms came on. We had to exit immediately because we lost the ability to maintain highway speed.

- Bel Aire, KS, USA

problem #254

Apr 012014

Prius 4-cyl

  • 46,200 miles
I am writing due to having had my 2010 Toyota Prius self accelerate while driving on four occasions. This began occurring after I took my vehicle to Toyota of clermont, Florida for a routine service on 3/31/2014. While the vehicle was there, the dealership also performed a recall on the vehicle. This recall is referenced as: Tech(s) : 20799 recall eoe motor generator and power management update perform software update for mg ECU and power management ECU agg09A 0.7 as of 8/5/2014 my vehicle has had unintended acceleration on 4 occasions. In 3 of the 4 I know it has occurred as I released the brake. This release is confirmed by the fact that it is necessary to reapply the brake to stop the acceleration. The 4th occurrence may also have occurred after a brake release. I have attempted to resolve this problem via both my local Toyota dealer and Toyota customer experience center at 1 800 331-4331. I am being told the problem is operator error. I have done the research to see if this is even possible. For me to apply the brake and fuel simultaneously would be both extremely difficult and very obvious. Additionally if this diagnosis were correct the vehicle would stop accelerating when the brake was released. In fact the vehicle accelerates when the brake is released not while the brake is depressed.

- Clermont, FL, USA

problem #253

Apr 232014


  • 67,655 miles
April 23,2014 entered a parking structure, when parking the car, the car accelerated, without reason. Car hit and broke the parking barrier, which was a oak log. Reported to Toyota dealership but did not want to view the car, claimed it was probably operator error. Foot both on gas and brake at same time. I do not drive with two feet, said did not think it was that. He then referred me to the Toyota corporate line, I have a file with them about the acceleration issue. Just happy this happened in a parking structure and not in a crosswalk situation where a pedestrian could have been hit.

- Madison, WI, USA

problem #252

Apr 182014

Prius 4-cyl

  • miles
If the vehicle hits a pot hole while slowing down, there's a sudden loss of braking power and the vehicle moves a few feet forward. The vsc light comes on at the same time. I'd noticed this a few times in the past but with the roads deteriorating after a bad winter, the pot holes are bigger and this is very prominent and scary. Going to take to the dealer for inspection. I feel it's definitely an issue with the braking system.

- Hamilton, NJ, USA

problem #251

Nov 052012

Prius 4-cyl

  • 23,717 miles
When parking, my 2010 Prius accelerated forward causing it to go over a curb form damaging the front bumper. Unexpected acceleration has caused four accidents damaging my car. I have records of these repairs. The hybrid system went out 8/30/2013 and in March,2014 the back brakes fell off: No bolts, pads, caliber, fluid were in place when it was towed to robbins Toyota in texarkana, tx. The front right booster was blown out while in this shop. My vehicle there over a month for various reasons.

- Chatham, LA, USA

problem #250

Mar 152014


  • miles
As I was approaching a red light I applied the brakes and then shortly after hit a pot hole and the car lunged forward as if accelerating on it's own. Fortunately there wasn't another vehicle in front of me as I would have most definitely rear-ended it. I almost shot into the intersection and most certainly shot past the normal stopping spot for waiting at a red light. Scary incident to say the least.

- Hamburg, NY, USA

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