I just bought a 2013 limited 2 weeks ago and noticed the same problem (that im no where used to or comfortable with).

On the hwy, doing around 60, went to merge into the left lane (very quickly), there was a car approaching fast to close the gap.... i dipped over and stabbed the gas pedal (as i would do with my reg cars) and got NOTHING!...

Out loud i was like WTF!! And obviously the car pulling in fast behind me jammed on his horn and brakes since i created a wall for him to almost run into... (i felt like an ass, and this was not my intention).

Needless to say i will not do this again in this car because i am now afraid to jump into traffic in this car and create a liability (smdh)...

So yeah... ditto on the dead pedal!!

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When this happened did you floor the pedal past the click? My 2016 HSH does the same thing when you put your foot down, but I have been getting around it by putting the throttle all the way down, and then past the click. Power is delivered with a 1 second delay which is more or less acceptable for that situation.

 

That's all very interesting. I think I only used 100% power once, to test 0-60 time. It didn't bog down or anything. Are y'all having any kind of codes thrown?

 

no error codes thrown at all.

 

If the transmission suck in 1 st gear, this car can't even reach 40. Since it can still accelerate, I assume that your transmission miss the best point for shifting. Maybe you can ask dealer to reset your transmission software? (or reset ECU?)

 

Have you tried it in "performance" mode and tried flooring it ? It will always start out in Eco mode when started.

In the summer with my Subaru, I would turn off the air when I really needed to move, then switch it back on.

 

That's what I'm thinking. Eco mode is the issue, especially when driving in HEV mode.

Another person posted that he had trained himself to turn Eco mode off when he got into the car.

 

The sad part of this is: I took the car to my Hyundai dealer who test drove and verified the symptoms. However, when they contacted Tech Support at Hyundai, they were told: "This is normal behavior. The driver should not accelerate at 100%." (Although, Hyundai does advertise a zero to sixty time of 7.6 seconds.) Oh, BTW, this did NOT occur with the Sonata they gave me as a loaner while mine was in for repair.

I assume the loaner they gave you was not a HEV or PHEV?

 

My experience is definitely due to the Rev Limiter killing the engine for a second. You are correct "Frank Xu", I am not hitting 40mph. After 2 or 3 cycles of the Rev-Limiter killing the engine, the transmission finally shifts to the next gear.
Yes, "introspection", this happens from a dead stop or on an entrance ramp with the pedal pushed past the "click". I have found that backing off to just before the click, the rev-limit is not reached. However, the car doesn't accelerate very quickly either.

As I said in my original post, this happens in Normal or ECO driving modes, (no Performance mode on Sonata plug-in), and when using the EV, HEV, and CHG power modes.

I called Hyundai Corporate and logged a case for this so, I will see what they say. "Frank Xu" may be on to something with the transmission re-programming idea. I really feels like it hangs in each gear way too long and also seems to spend an unusually amount of time between gears when driving "normally".

 

Glad my assumption is right. It will be nice if you post the reply from Hyundai so that everybody know how to deal with it.

 

Since I haven't needed to accelerate like that, I haven't experienced what you are experiencing. Over 85% of our driving is around town and rarely on the freeway.

The only time I've experienced anything like your issue, is when I was in HEV, Eco modes and going up a hill starting from a full stop.

Hopefully, Hyundai can figure it out and fix it for you. If you think it's dangerous, open a complaint with the federal highway administration.

 

The '16 has a Mode button on the console. Eco is the default, one push gets you Normal and and another gets you Sport. A very noticeable difference in power between each one.

 

I have the same problem, loss of acceleration with my 16 Sonata plug in hybrid. Dealer checked a few things but gave the car back saying it was fixed. I still noticed the same problem. Putting foot all the way to the floor makes it worse. It makes no difference the position of the mode button, still have the same problem.

 

Does it happen in all ambient temperatures, with all stages of engine warm-up?

 

Hot, warm, cold. Doesn't matter. Ambient temperature or engine temp. The engine doesn't Rev high enough for limiter to kick on. The dealer said No diagnostic codes were present. It almost seems like there's not enough fuel being delivered and the engine doesn't accelerate hard, like I remember. The dealer said they put a scope in the gas tank but saw no signs of any visual problem. I'm going to check on changing the fuel filter if one exists.

 

Great thinking! Indeed, sounds like something in fuel delivery. Kinked fuel hose, clogged fuel filter, etc. Let us know what you find? Maybe try to measure the flow of fuel somehow?

 

BTW, if you've never closely perused the manual, you have the ability to charge the hybrid battery while parked by flooring the accelerator and it does not damage the gas engine. I'm guessing that is what the reported "click" is reported above; it's putting the car into that mode.

 

Finally the acceleration problem is fixed! Two service technicians test drove, one with a computer connected while the other drove.
Trying to accelerate on the expressway entrance ramp is when the problem was the worst. They contacted Hyundai and only one other tech support case was reported with this problem. They reset the "adaptive values", and said specifically it is not related to the transmission, and did not reset any transmission parameters. From the service report: (Clayton) "Customer concern confirmed. Found that at high throttle input at any speeds the vehicle would fall on its face and not accelerate. Connected scan tool and found no codes stored. The engine felt as if it was either being throttle down due to another input or it could be bad gas. Monitored fuel pressures and found no problems. Reset Adaptive values and found that after doing this the problem was no longer present. Could not get the vehicle to act up at all after doing so. Had tech line case number 2018031200343." It was stated that this problem is NOT NORMAL and agreed that the vehicle was not safe to drive. If more people would have the problem diagnosed properly so it can be reported, then Hyundai may be able to create a technical service bulletin or recall to correct the problem. I put up with the issue for more than 6 months to wait for it to get worse, and was lucky I didn't get rear ended at the end of the expressway on-ramps during this time.
('16 Hyundai Sonata Plug-In Hybrid Limited)

 

Thanks for the good information and what seems to be an effective corrective action. Please let us know if this solution continues to be effective over time.

 

A restricted exhaust system could create the same symptoms but that usually doesn't happen at a low mileage vehicle.

 

JKK how did you know? Today the problem started rearing it's ugly head again. Next step is to contact Hyundai customer connect for additional help with resolving the problem.

 

Is that means after the service man reset "adaptive value" the same symptom shows again? That's nasty.
BTW do you ask them what is "adaptive value" ?

 

What ive noticed is turning off blue drive on my '13 will not let the car fall on its face when i need to accelerate quickly.. TBH, i thought this problem was a product of the hybrid system and that i have to live with it, so i adapted (blue drive turned off). Unfortunately my car is out of Hyundai warranty (I have an extended one but doesnt cover hybrid side.. lame) Also i noticed it doesnt always fall on its face, other times it hets up goes with no issue when blue drive is still on. Go figure.

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Loss of Acceleration Problem - Now FINALLY Resolved, Replaced Fuel Pump

After two failed attempts by the dealership to fix the problem (no codes found), contacting Hyundai Customer service for additional help was the key to successful troubleshooting. The dealership initially only checked fuel quality and static fuel pressure, which were normal. Here are some notes from the service reports: "... instructed to check CAM CAM position actual and desired set points in current data. These also checked out. Performed flight records and uploaded them to our field service engineer. He found that the high pressure fuel pump was sticking in the on position causing the fuel pressure to spike above normal causing the throttle plate to close which was causing the concern. Replaced the high pressure fuel pump, reset adaptive values and reset hybrid starter generator resolver calibrations. Test drove vehicle and found that the problem was gone. The car was now accelerating as designed." :grin2:
Hopefully this will help others who are unable to analyze flight records.
I did however suspect something with the fuel filter or fuel pump, which is what I would have replaced anyway trying to guess what to fix.
Otherwise, most people would be out of luck, and just live with it, like others have mentioned in these forums.

 

Loss of Acceleration Problem - Now FINALLY Resolved, Replaced Fuel Pump

After two failed attempts by the dealership to fix the problem (no codes found), contacting Hyundai Customer service for additional help was the key to successful troubleshooting. The dealership initially only checked fuel quality and static fuel pressure, which were normal. Here are some notes from the service reports: "... instructed to check CAM CAM position actual and desired set points in current data. These also checked out. Performed flight records and uploaded them to our field service engineer. He found that the high pressure fuel pump was sticking in the on position causing the fuel pressure to spike above normal causing the throttle plate to close which was causing the concern. Replaced the high pressure fuel pump, reset adaptive values and reset hybrid starter generator resolver calibrations. Test drove vehicle and found that the problem was gone. The car was now accelerating as designed." :grin2:
Hopefully this will help others who are unable to analyze flight records.
I did however suspect something with the fuel filter or fuel pump, which is what I would have replaced anyway trying to guess what to fix.
Otherwise, most people would be out of luck, and just live with it, like others have mentioned in these forums.

I know this is an older post. So if you're still on here do you know if they replaced the high pressure pump on the valve cover or the one in the tank?

 

Mine also has this problem. Has done it ever since it was new. Just dealt with it thus far found that I can feel when it’s about to go out, ease up on the gas a little, and avoid it altogether. Annoying as F though. Only negative on this car. The only one. ?

 

Here’s my original post thread. Mine’s just hybrid SE though not plug in but it sounds like it is doing the same thing. http://www.hyundai-forums.com/#/topics/556001?page=1

 

This also happened to me today in my 2016 Plug-in, trying to jump into another lane from a near dead stop. Yes, it feels like 1st maxes out, then nothing, nada. Scary. Any further info you're able to pass on. BTW, I just had the battery recall performed, so either that's not the problem, or the recall was not performed properly.Mike

 

Thank you so much for posting this information. I'll be sharing your experience with my dealer when I bring this issue to them as well.

 

Update on this, there was and Oil pump recall(their first try, didn't work), high press fuel pump bad, and spark plugs which were not replaced when they did the engine replacement. those last 2 fixed it for about 3 months and then it started the sputtering and stuff again and 3 months after there a different cylinder misfire.

 

You have something called intake manifold runners. They are flaps inside the intake that are closed until you give x amount of acceleration then they open . If they are malfunctioning it will not allow your engine to get the air it needs causing it to choke down. The actuator is probably bad and the easiest fix