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Discussion Starter · #1 ·
I've been having an intermittent issue when slowing down to a stop from high speeds (40+ MPH) and then accelerating again. This usually happens when i am trying to make a right turn onto a busy street and i need to get moving into traffic quickly during an opening. What winds up happening is nothing, the car hardly moves for a good 1-3 seconds and then it suddenly hits wide open throttle and you start to get power.

This is my first hybrid and DCT, so i'm not sure if this is normal since the car seems to operate perfectly fine in almost every other situation.
This issue occurs in all drive modes.

I have an appointment in a few weeks to take the car to my dealer, but i wanted to see if anyone had run into this or if this is to be expected.

Any thoughts?
 

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we have a limited hybrid, and i have not noticed that situation. there is a turn we drive on whenever drive the car, but it is slowing down from about 60, turn right, but not step on the gas hard, the speed limit is only 35. the transmission is very smooth in that situation. when we had our 2016's, on that same turn, after turning, the car was sluggish because it did not want to downshift. i got in the habit of putting the shifter into the manual gate, and pulling it down manually to second, accelerate, and as the car was accelerating, shift back to drive. did that for years
 

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I've got a Limited Hybrid....sometimes there may be a stutter step for like a second or 2 and it kicks in quick.... Come to think.of.it, there was a little lag in my 2017....but now since I'm used to it, I think nothing of it. I ease into it for those couple seconds and she takes off. If I try to push her out of the gate immediately she stutter steps.
 

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Knock on wood, no issues here as far as acceleration from slow speeds/full stop. Its odd because we were dead set on either the Sonata or K5, but after driving both the 1.6T K5 and Hybrid Sonata we felt the acceleration was very non-linear and the 1.6T in particular had a disconcerting 1-2 second delay when accelerating from a stop that was a deal breaker for us. It felt like there was no power at all for a moment which made pulling into parking lots or side streets during heavy traffic nerve wracking.
 

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Discussion Starter · #6 ·
i've seen the problem described on the sonata forums as the death lag, its basically the same thing thats happening to my car, still trying to figure out if there is a solution, but it doesn't seem like it.
 

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Knock on wood, no issues here as far as acceleration from slow speeds/full stop. Its odd because we were dead set on either the Sonata or K5, but after driving both the 1.6T K5 and Hybrid Sonata we felt the acceleration was very non-linear and the 1.6T in particular had a disconcerting 1-2 second delay when accelerating from a stop that was a deal breaker for us. It felt like there was no power at all for a moment which made pulling into parking lots or side streets during heavy traffic nerve wracking.
we have a 2020 sonata 1.6 and an elantra hybrid. i think the transmission in the 1.6 is superior to the hybrid. i always use auto hold, and accelerating from a stop is instant
 

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I've been having an intermittent issue when slowing down to a stop from high speeds (40+ MPH) and then accelerating again. This usually happens when i am trying to make a right turn onto a busy street and i need to get moving into traffic quickly during an opening. What winds up happening is nothing, the car hardly moves for a good 1-3 seconds and then it suddenly hits wide open throttle and you start to get power.

This is my first hybrid and DCT, so i'm not sure if this is normal since the car seems to operate perfectly fine in almost every other situation.
This issue occurs in all drive modes.

I have an appointment in a few weeks to take the car to my dealer, but i wanted to see if anyone had run into this or if this is to be expected.

Any thoughts?

I had this happen to me today. I was commuting to work on a commonly done route where I accelerate to high speeds over a short highway distance, a few kilometers, but as I was gliding along and starting to brake approaching the roundabout, the car would jerk forward as it was downshifting - which was controlled by the braking but was very disturbing. Afterwards, when I attempted to engage the gas pedal to accelerate, the engine revved without moving the car and then it finally engaged and started to accelerate with rough shifts and when I needed to come to a stop at my turn into work it failed to accelerate again, finally engaging after revving. As I slowly moved toward my parking spot, the car was jerking forward without adding any gas and even while braking. I turned the car off, waited a little bit, and then turned the car back on and it seemed to be running fine. I drove home without incident, my oil change appointment next Friday will now include looking into this. Hopefully supply chain issues won't prevent me from having a car if I do need parts replaced under warranty.
 

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Well, I had this exact scenario happen this morning. I step on the gas...nothing...a few seconds later, bam - flying down the road. I stop....high pitched whine and no power for a few seconds. The car was very erratic and surging forward when I was trying to stop. Never had it happen before today. Did anyone have any luck at the dealer with what may be going on? I turned it off and turned it back on and then it was fine.
 

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Well, I had this exact scenario happen this morning. I step on the gas...nothing...a few seconds later, bam - flying down the road. I stop....high pitched whine and no power for a few seconds. The car was very erratic and surging forward when I was trying to stop. Never had it happen before today. Did anyone have any luck at the dealer with what may be going on? I turned it off and turned it back on and then it was fine.
They just reset it to relearn driving habits. The engine light never went on and they cannot diagnose anything without a computer telling them. That's the problem with intermittent issues like these. I will come back to report if it happens again. The mileage seems to be lower since the incident, but I think that is just recent colder temperatures. I was leery of the DCT but was so hopeful because I like so much about the car. It's always in the back of my mind now. Someone in the forums somewhere mentioned that an "actuator" needed replacement in theirs, but they had the engine light come on or was reproduceable on a mechanic's test drive.

I don't recall a whining so much as my engine revving and the car not moving forward. My odometer was at 5700km, or about 3540 miles.
 

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I drove it tonight and it was fine. I was driving it extra hard in the city.....maybe I switched driving modes too much. You're right, it is in the back of my mind, but she drove like a champ tonight. Her name is now Christine. I've never named a car before but she has one now. Thanks for writing back and letting me know what they did.
 

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Hello Archer,

Was this taken care of? My 2021 Elantra Hybrid started doing that yesterday. I took it right to the shop and left it. They were not able to duplicate the problem. I went back this morning for a test drive with the tech in the car, and drove it for another hour after I dropped him off, but the issue would not present itself again. I left the car there with them letting them know that the car is not safe to drive. The problem exists regardless of it presenting itself at the time and I am not willing to continue driving it until I can have the problem return, potentially putting myself and my family at risk for physical harm. They have the car now and they will be contacting me later. What a shame. Drove a Prius for 11 years and never had anything like this happen.
I've been having an intermittent issue when slowing down to a stop from high speeds (40+ MPH) and then accelerating again. This usually happens when i am trying to make a right turn onto a busy street and i need to get moving into traffic quickly during an opening. What winds up happening is nothing, the car hardly moves for a good 1-3 seconds and then it suddenly hits wide open throttle and you start to get power.

This is my first hybrid and DCT, so i'm not sure if this is normal since the car seems to operate perfectly fine in almost every other situation.
This issue occurs in all drive modes.

I have an appointment in a few weeks to take the car to my dealer, but i wanted to see if anyone had run into this or if this is to be expected.

Any thoughts?
 

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You are awesome! I simply can't be without my car and I know the dealer would just give it back to me. Glad that you are being hard-core with them - you may be helping us all out.
FYI - might be picking up car tonight but I let the dealership know that I have spoken with my insurance company, an attorney, the BBB, and I have an application in with the NY Attorney Generals office. I can't believe that the dealership has to wait for the life threatening problem to be present for them to witness BEFORE they can escalate the issue to Hyundai for tech support. Yes, the dealership is telling me that they are unable to utilize Hyundai as a resource until it happens again while a tech from the service department is present. God forbid I have my family with me and the car gets me into an accident.
 

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Following up here, it happened to me again on my morning commute (8700km) - I pulled over and restarted the car which fixed it. A "tell" that this may happen is when foot is off the petal and accelerates slightly between down shifts while it is supposed to be slowing down. Another thing is that the previous two trips involved a lot of highway driving before "normal city" driving on the commute. This is actually the same thing happened before the first incident.
 

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2021 Hyundai Elantra N-line DCT
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Following up here, it happened to me again on my morning commute (8700km) - I pulled over and restarted the car which fixed it. A "tell" that this may happen is when foot is off the petal and accelerates slightly between down shifts while it is supposed to be slowing down. Another thing is that the previous two trips involved a lot of highway driving before "normal city" driving on the commute. This is actually the same thing happened before the first incident.
Auto manufacturers needs to stop with with all this software crap. I may sound like a boomer but man.... At least work out the severe bugs.

Some will make it past development which is understandable but some bugs should not.
 

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Any follow up on this? I had the SAME thing happen today. I was driving on a 3 lane highway and the 21 Elantra Hybrid with 9K on it lurched forward. When I hit the brakes it wanted to go even harder and needed significant pedal pressure to slow it down. When I pressed the gas the car slowed down as if I was trying to break. Absolutely unreal - and scary. People were looking at me like I was insane. No engine light what so ever on this. Restarted the car and then it was fine for the 4 extra minutes I drove it.

On two other trips the gas engine just quit. The car continued to move on electric power. I was able to move to the side of the highway and restart the car. It worked fine. This time it DID give a code (Throttle control issue). I got the code form the Hyundai App, took a screenshot and hauled car to dealer. Got the "well, there's no code in there now so there is nothing to fix" routine.

I filed a complaint with the NHTSA. Hopefully others will do the same before one of us gets slammed into the car in front of us.
 
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