Vehicle stutters and vibrates at lower speeds. Also their is a knocking sound coming from underneath the vehicle. Brought back to dealership 3 times since March. All 3 times I was told it is perfectly normal for the car. I read online that other people have experienced similar issues.

- Port Jefferson Station, NY, USA

When coasting from a low speed (45-55) to near stop the transmission "locks up" while nowshifting. The vehicle violently locks up, so bad that it feels like you've hit something. The steering wheel is also affected to the brute force. Nissan issued a mandatory recall transmission reprogram which I promptly had done to the vehicle. However, just this Friday, 5/3/13, the transmission again did this. Both times I was lucky that I was on back roads with little to no traffic and that I was able to maintain control. This is a serious problem that in the wrong conditions (ice/snow/rain) or when oncoming traffic is coming could get someone killed. I can't explain just how violent the downshift is, other than to say the first time my 6 year old began crying in the rear seat because he thought we wrecked, and that the 2nd time my cell phone was jarred from a very rugged cradle.

- Dry Ridge, KY, USA

There is a shuttering vibration in drive train when engine is at 1500 RPM and going up an incline. Eventually it is going to cause loosing of bolts and cause crash.

- Throop, PA, USA

The cvt transmission is vibrating violently from 1200~1800 RPM which could potentially cause premature transmission failure during driving. Such vibration also compromises the mileages that Nissan has declared therefore more green house gas emission for same miles. Many 2013 Altima owners complained about the same thing in forums such as edmunds, cars.com and etc. It is a mechanical design flaw the could severely jeopardize the car and hurt the people in it though Nissan never admit it or fix it in the past one year. I sincerely request NHTSA to look at this issue. Thanks.

- Chester Springs, PA, USA

After the first car with 2000miles air bags did not go off in the accident so went bought another new one the airbag light was on in 70 miles so put a new seat from another car Nissan did not have a new seat no the air bag light does not work properly and the car has a viberation that Nissan cant fix need to stop selling lemons.

- Horton, AL, USA

I have a 2013 Nissan Altima sv with 10800 miles on it. About 5000 miles ago began to hear and feel vibration with acceleration. Noise continued to get worse. Took it to a local Nissan dealer and they said the issue was coming from the cvt transmission. They had to replace the serpentine belt and the tensioner. Vibration is currently better but concerned this is just a short term solution. I think Nissan needs to put a recall out and find a long term solution.

- Chambersburg, PA, USA

I purchased this car on 3/8/2013 as brand new with 24 miles on it. 7 days later when starting up the motor the engine struggled to catch or start running. This has happened 3 times now. Will be contacting Nissan. This is unacceptable for having a week old "new" car. Still waiting for response from dealership.

- Dyersburg, TN, USA

Abnormal transmission grinding / lugging noise of the transmission at low RPM (1200-1600). Nissan claims noise is as designed. How is grinding noise in the transmission with a car that has 3000 miles normal? again Nissan claims that this is normal. 1800-343-6913 ext. [xxx] case # [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Kent, WA, USA

The contact owns a 2013 Nissan Altima. The contact stated that while driving approximately 25 mph, the vehicle jerked violently while the contact was attempting to decelerate. The contact also stated that the failure recurred intermittently and when driving at different speeds. The vehicle was taken to the dealer where the failure could not be duplicated. The vehicle was not repaired. The manufacturer was contacted. The failure mileage was 600.

- Houston, TX, USA

When starting the car the starter would keep cranking after the release of the start button, the passenger air bag light stays on sometimes even when a passenger is in the seat also the rear seat belts are very hard to lock in do to the receiver end pushes down into the seat when driving there is a few problems the low end rattles and shakes and 45 and above there is a wining noise from the engine compartment that sounds like a bad alt bearing or trans problem it gets louder the faster you go very annoying with today technology these problems and this is just a few is a big step back for Nissan not a happy customer just broke 6000 miles.

- Manahawkin, NM, USA

Cvt transmission shutter, while driving from stop to go, car felt it was going to stall, like when turning left in traffic.

- Chicago, IL, USA

Purchased a new 2013 Altima sedan 3.5sl in November 2012. At approximately 500 miles, upon acceleration from a stop, the car jerked violently for 2-3 seconds before kicking in and accelerating (as if driving a manual transmission and attempted to start in 4th gear). This has happened 2 more times since. Additionally, often while accelerating the rpms will drop significantly and the car will shudders before kicking back in and accelerating. Lastly, on occasion, while decelerating, the car will jerk harshly (as if driving a manual transmission and shifting into too low a gear for the speed). Took the car into dealership and they said they could not duplicate the issue. Contacted Nissan corporate 2/6/2013 and the representative told me she hadn't heard of anyone else having this problem, but that she would open a ticket. Called back to Nissan corporate 2/27/2013 to follow up and was told that my previous ticket had been closed.

- Oklahoma City, OK, USA

Started to drive from a park position I was going already around 15-20 mph before transmission kicked into gear.

- Brooklyn, NY, USA

Transmission slipped I was at a red light turned green started to move when I felt a pull back on the car and then car shot forward.

- Brooklyn, NY, USA

Purchased brand new with 2 miles. At 4500 miles, heat gauge indicated an increase in engine temperature. Drove 2 miles to a service station, and upon opening the hood, anti-freeze was sprayed everywhere. Car was towed to dealer. Dealer inspected, and said the radiator had leaked, so the dealer replaced the radiator. After replacement, the dealer performed a test drive, when the check engine light came on. Dealer performed pressure tests, and said the engine would need replacement.

- Houston, TX, USA

I have owned this car for all of a week. There are at least 2 major safety concerns. The first is the passenger air bag. The light on the dash indicates that the air bag is "off" when my wife sits in the passenger seats. She is an adult, height about 5' 2" and weighs approx. 120 lbs. Apparently I am not the only one with this issue. Calls to Nissan are a waste of time at this point as I'm told nothing about how this will be resolved. The other issue is with the cvt transmission. Under light acceleration, at about 1200-1500 RPM there is a vibration and its very noisy. It almost seems like the car is going to die out. The other issues I am having with the car of which there are a few are not necessarily safety related so I wont post them here. Needless to say, there are better and safer choices out there. Choose wisely.

- Buffalo Grove, IL, USA

Vehicle has been in the service department five times for different things in less than 2 months. Main problem reported each time in service is my transmission. Between 20-50 mph and 1000-2500 RPM the car will violently shake and lose power. I have to press the gas pedal harder to get the car to stop shuddering and pick up acceleration. I have almost been involved in tow rear end collisions B/C of the lose of power and shuddering. Nissan states that I must wait for a reprogramming fix. I have filed a complaint with Nissan Consumer Affairs. In the meantime I have to sacrifice my safety? totally not acceptable. I have owned 3 previous Nissan products with no problems.

- North Augusta, SC, USA

When accelerating gently or decelerating you can heard a rumbling and vibration noise.

- Woodside, NY, USA

The contact owns a 2013 Nissan Altima. The contact stated that after 20 days of driving, while stopped, a strange vibration was emitted from the undercarriage. The vehicle was taken to the dealer where the contact was informed that there were no failures. The contact stated that the failure recurred several times and was taken to the dealer on each occasion. The manufacturer was contacted and informed the contact that the vehicle was not included in any recalls. The vehicle was not repaired. The approximate failure mileage was 600 and the current mileage was 3,333. Updated 03/13/13 the consumer stated a mechanic test drove the vehicle and confimed the vibration. On the second visit to the dealer the general manager and service manager suggested to buy a new maxima or Altima. The consumer declined. The vibration only worsened causing a third visit to the dealer. Updated 03/28/2013

- Fall Church , VA, USA

Brought car in to dealer for a recall that the transmission needed to be reprogrammed. Several weeks later noticed that the engine sounded louder and rattled on acceleration. Proceeded to get worse by the day. Brought to dealer on Wednesday and was told the transmission needed to be replaced. The vehicle has approximately 2000 miles on it.

- Seymour , CT, USA