2011 Sonata Engine Stalls When Sitting at Traffic Light

It could just be that the air flow sensor is blocked. It's a very easy fix, I had the same problem with my 2000 SS Monte Carlo. Just ask the guys at Auto Zone and they should be able to tell you where its at. When I had the problem my RPM's would fluctuate at a stop light before failure do you have that problem too?

Replies to this message:

ethandou (Mar 17, 2012 6:41 pm)

#5 of 12 Re: 2011 Sonata Engine Stalls When Sitting at Traffic Light [ephraim1222] by ethandou

Mar 17, 2012 (6:41 pm)

Replying to: ephraim1222 (Feb 21, 2012 2:01 am)

The RPM is quite staple at a stop. Based on my previous experiences, all were like unplugging power supply.

#6 of 12 Re: 2011 Sonata Engine Stalls When Sitting at Traffic Light [ethandou] by daysf1

May 08, 2012 (8:31 pm)

Replying to: ethandou (Jan 09, 2012 1:29 pm)

There is a throttle cut off on your Sonata that will cut the fuel supply to the engine if the brake is applied while still having your foot on the gas pedal (can only be done if you drive with both feet, one on gas other on brake, or you have REALLY wide feet). Have heard of this happening when stopped on a hill as people are afraid of drifting backwards, or there are alot of people that do drive with both feet (racecar drivers). This is a safety feature designed in response to a certain car company dealing with reports of runaway car that were unstoppable even with both feet applied to the brake (Toyota). Toyota claimed it was floor mats getting stuck and not releasing the gas pedal. By utilizing this safety feature, Hyundai has eliminated this as ever being a possibility on their vehicles. It is on most of their newer vehicles now and will be on all other models beginning in may. This will also be a federally mandated safety feature i n the near future, as Hyundai usually does these kinds of things long before other manufacturers or even the government steps in as was the case with standard stability control across the entire Hyundai lineup. Not sure if you fall into this category but either way you now know of a safty feature on your Hyundai that you probably didnt know you had.

Replies to this message:

kb9oau (Jan 09, 2013 7:35 am)

#7 of 12 Re: 2011 Sonata Engine Stalls When Sitting at Traffic Light [targettuning] by jay_kay

Jul 11, 2012 (12:28 pm)

Replying to: targettuning (Jan 10, 2012 7:01 am)

I've had my '11 Sonata Limited for 2 years now. I just discovered this discussion today. The car has just over 20,000 miles and twice it has left me stranded, when it won't start because of the brake switch problem. Both times it had to be towed into the dealer and the switch replaced. I have also experienced the shudder while sitting at a stoplight. I haven't actually had the engine stop, but on maybe up to 6 occasions -- and to varying degrees -- I have had the car shake. The first time was the worst and, like I read here, I thought someone in traffic had hit my car and instinctively looked around to find the culprit .... but there was none. I really hate this car ....... and my experiences with the dealer are approx. 20X worse than the car. How this dealer is allowed to operate under a Hyundai sign is disgraceful.

#8 of 12 Engine Almost Dies by larrys1352

Oct 19, 2012 (2:07 pm)

I have a 2012 Sonata Limited that I bought in November 2011. Since we're retired we don't drive too much and the car has less than 7,000 miles after a year.
My problem is that several times a month, when I hit the gas quickly to enter traffic the car almost dies...it never does die...it drops to 0 mph and then in 1-3 seconds it accelerates. I am really concerned about getting braod-sided some day.
I mentioned this to the service department but of course they could not replicate.
Does anyone else have this issue? Any ideas?

Replies to this message:

normandy2 (Nov 16, 2012 8:51 am)
- larrys1352 (Nov 16, 2012 10:06 am)
  - normandy2 (Nov 17, 2012 9:29 am)

#9 of 12 Re: Engine Almost Dies [larrys1352] by normandy2

Nov 16, 2012 (8:51 am)

Replying to: larrys1352 (Oct 19, 2012 2:07 pm)

I have purchased a 2013 Hyundai Tucson Limited and it now has 4000 miles on it.
Yesterday while making a left hand turn the same thing happend to me.
I almost got broadsided by oncoming traffic. The same thing happend to me this morning.
I haven't brought the car into the dealer yet and I hesitate to give it to them if they keep it for a week and then tell me than can find nothing wrong with the car.
I also have a 2009 Hyundai Sonata with 30000 miles and have not had any problems.
I am about to get rid of the car and buy a different make and model.
Any info will be appreciated.

Replies to this message:

larrys1352 (Nov 16, 2012 10:06 am)
- normandy2 (Nov 17, 2012 9:29 am)

#10 of 12 Re: Engine Almost Dies [normandy2] by larrys1352

Nov 16, 2012 (10:06 am)

Replying to: normandy2 (Nov 16, 2012 8:51 am)

I found my answer and maybe this will help you. Many years ago I worked in Northern NJ but lived in South jersey. During the summer I would be in bumper to bumper taffic for hours so I started driving with 2 feet, I still drive with 2 feet. I read somewhere on these Edmunds blog that if you hit the gas and brake at the same time...even for a second...the engine will "almost" stall.
So I focused on that and sure enough the problem went away.
Maybe this will help you.

Replies to this message:

normandy2 (Nov 17, 2012 9:29 am)

#11 of 12 Re: Engine Almost Dies [larrys1352] by normandy2

Nov 17, 2012 (9:29 am)

Replying to: larrys1352 (Nov 16, 2012 10:06 am)

Thanks Larry,
I read the same item about pressing the brake while pressing the the accelerator. The article I read states that Hyundai put in a switch on the break pedal to cut off gas supply to the engine if you press the break while accelerating. Has to do with the problem Toyota had with run away cars.
I read that the feds will be making this manditory on all cars.
Hyundai just beat them to it.
I don't understand why Hyundai doesn't make this info available to there dealerships so they can pass it on to their customers.
It could save someones life.
By the way, I started driving with one foot and the problem went away.
Thanks again for your reply.
Normandy2/Elkhorn,NE

#12 of 12 Re: 2011 Sonata Engine no start by kb9oau

Jan 09, 2013 (7:35 am)

Replying to: daysf1 (May 08, 2012 8:31 pm)

Just drove my 2011 sonata off the lot 4 days ago, purchased used with 77K on the odometer, no problems until I filled the tank and drove 500ft and parked and shut down the engine waiting for my brother for 5mins. Tried to start and the starter did as it should but the engine just sputtered enough to disengage the started just reaching 1K on the tack. Tried many many times and same response. Still sitting on Kroger parking lot. Any one else have a similar problem?

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