fairly significant
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
10,093 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

problem #6

Feb 102011


  • 13,021 miles


After car sits for several days engine will idle very roughly upon starting for almost one minute. Idle is so rough that I thought the engine mounts would break and creates a very 4 loud rattling sound. This has happened three times, two after sitting for several days and once after just sitting overnight.

- Skiatook, OK, USA

problem #5

Sep 302010

Prius 4-cyl

  • 17,000 miles
Loss of braking effectiveness. Happens when going over bumps while applying the brakes. You don't lose braking power completely, but it would be like you had lifted your foot off the brakes partially. It has happened about a dozen times since I have owned the vehicle (a little over a year). I am unable to determine what factors make it happen. I don't know if it is speed, severity of the bumps, or braking pressure, or combination. I know that temperature makes no difference, as it has happened in winter and summer. The last incident happened when a bicyclist moved in front of my car to avoid bumps. I applied the brakes (it was not severe), and as I went over the bumps, I lost braking power. My speed was approximately 15 mph. Toyota has done a recall on the brakes, but I continue to have the problem. I have talked to other owners, and they are having the same problem, even after the recall. The consumer stated when he drove over a bump in the road, the braking decreased significantly for approximately 3 seconds. He also stated the engine raced briefly, but the vehicle was not in gear at the time. Updated IVOQ 03/01/11

- Edina, MN, USA

problem #4

Apr 232010

Prius 4-cyl

  • 6,239 miles
2010 Toyota Prius. The consumer stated he experienced two safety issues; loss of brake effectiveness and engine race when the consumer applied the brakes when going over bumps/rough roads, or in marginal conditions due to snow/ice when approaching a stop sign, he would lose braking effectiveness. The consumer took the vehicle to the dealer for a recall repair on March 24, 2010. However, he continued to experience loss of brake effectiveness. The consumer pulled into a neighbor's driveway after driving less than one mile from his home. After pushing the park button, but before pushing the power button, the engine began to race. It was not at an extreme high RPM and it was not for an extended period time, but it did last for several seconds. After the vehicle went down to normal RPM, after a S second or two, it began all over again. The consumer stated it was not a surge as the vehicle was not in gear at the time.

- Edina, MN, USA

problem #3

Mar 092010


  • 8,500 miles


2010 Prius II - when in park, or just slightly on the brakes and the engine switches from electronic to gas motor, the car rocks forward 1-3 inches. Very terrifying, but according to kendall Toyota of eugene, Oregon, this is "normal". I don' T know of any world in which a car moving on its own while in park is normal.

- Eugene, OR, USA

problem #2

Mar 162010


  • 5,800 miles
I was driving on the freeway with my cruise control on. It was set to 56 mph. All of a sudden, the vehicle started lurching. It was like it was trying to accelerate then slow down, then accelerate, then slow down. I immediately shut off the cruise control. It has also happened again today when I tried to use the cruise control.

- Aiea, HI, USA

problem #1

Nov 162009


  • 10,000 miles
Prius 2010 braking issue - problem has occurred at least 5 times; on rough surface, downhill surface or when wheels encounter a manhole or steel plate road cover. Problem is recurring. Car has 12,600 miles on it.

- Rockport, MA, USA

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