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I purchased the 2019 Hyundai Elantra GT N Line turbo / automatic...car new in August 2019 and today Oct 16th I took car in for oil change have 3500 miles on it. I left and everything was fine...drove highway speeds 70 mph using cruise control for 2 hrs. On return trip I tried to pass a semi and I had no power ..no acceleration.. rpms went up a little but no full acceleration/no power ... I was able to still drive .. but could not accelerate/ no power ... felt like the turbo had gone out. Took to dealership that I had gotten the oil change earlier that morning..didnt think it had anything to do with oil change .. they looked at it for about 3 hours .. they checked it for issue/fault codes found that it had several misfires.. So they swapped 2 of the ignition coils around and 2 of the plugs ..until they had no fault codes ..( but prior to them doing that I wanted them to keep car running so they could test drive , but a service advisor turned it off & the issue I had went away) also I noticed the exhaust sound ..sounded rough .. not smooth as in previous days/ months ) I picked up vechicle and all they had done was swap 2 ignition coils and 2 spark plugs .... they did not replace with new ignition coils or spark plugs ... Does any one know if there could be any other reasons for what had happened.... please advise ... I'm concerned that they just patched the issue ...& didnt fix the issue since they acted like they didnt really know what had caused the problem.... Thanks
 

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DCT or manual? If it's the DCT then it could be the DCT was misbehaving (too high a gear for the power given) and causing your engine to knock/misfire. If it's the manual, no idea and I don't have any technical suggestions *but* if you live close to another dealership, but if you left and the issue persists you might consider taking it to a different dealership's service department instead.

I purchased the 2019 Hyundai Elantra GT N Line turbo / automatic...car new in August 2019 and today Oct 16th I took car in for oil change have 3500 miles on it. I left and everything was fine...drove highway speeds 70 mph using cruise control for 2 hrs. On return trip I tried to pass a semi and I had no power ..no acceleration.. rpms went up a little but no full acceleration/no power ... I was able to still drive .. but could not accelerate/ no power ... felt like the turbo had gone out. Took to dealership that I had gotten the oil change earlier that morning..didnt think it had anything to do with oil change .. they looked at it for about 3 hours .. they checked it for issue/fault codes found that it had several misfires.. So they swapped 2 of the ignition coils around and 2 of the plugs ..until they had no fault codes ..( but prior to them doing that I wanted them to keep car running so they could test drive , but a service advisor turned it off & the issue I had went away) also I noticed the exhaust sound ..sounded rough .. not smooth as in previous days/ months ) I picked up vechicle and all they had done was swap 2 ignition coils and 2 spark plugs .... they did not replace with new ignition coils or spark plugs ... Does any one know if there could be any other reasons for what had happened.... please advise ... I'm concerned that they just patched the issue ...& didnt fix the issue since they acted like they didnt really know what had caused the problem.... Thanks
 

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If the dealership that did your oil change found that it was actually misfiring you should be taking in for warranty ASAP. There are a large number of possible things that could cause that to happen, and it's impossible to diagnose without OBD readouts, logs, testing.

Also, if you were passing a semi going 70mph(which I assume is like 110/120km/h) the car doesn't have a lot of acceleration. Like this car feels quick off the line because of the twinscroll and the small turbo, but if you're doing over 100km/h there's not much power left in it.. especially if you didn't gear down to get your RPMS up to like 4.5-5k.
 

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Also, if you were passing a semi going 70mph(which I assume is like 110/120km/h) the car doesn't have a lot of acceleration. Like this car feels quick off the line because of the twinscroll and the small turbo, but if you're doing over 100km/h there's not much power left in it.. especially if you didn't gear down to get your RPMS up to like 4.5-5k.
To your point, if the OP didn't downshift at all and was headed up an incline at really low rpms in 6th gear and then floored it, it might even be possible that the engine was lugging and misfired as a result.

I don't know if the DCT will prevent lugging by downshifting regardless of the driver intended gear, but it really should. There's a lot to driving a car with manual transmission that don't change just because you remove the clutch that many DCT drivers simply might not know...
 

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To your point, if the OP didn't downshift at all and was headed up an incline at really low rpms in 6th gear and then floored it, it might even be possible that the engine was lugging and misfired as a result.

I don't know if the DCT will prevent lugging by downshifting regardless of the driver intended gear, but it really should. There's a lot to driving a car with manual transmission that don't change just because you remove the clutch that many DCT drivers simply might not know...

Yep, agreed.

I actually got the downshift indicator last night for the first time in my life. I was going up a hill in 6th on the highway and hadn't shifted into 5th yet(I actually shifted into 4th as I was planning on accelerating). It was neat to finally see that. Also.. I got probably the loudest exhaust pop I've had when I dropped the clutch into 4th --- which was super satisfying lol.
 

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Discussion Starter #6
Latest Update: My car is an automatic.. seven-speed dual-clutch automatic transmission.. The car can still accelerate even at 60 to 70 mph ... but the other day ...there was no power at all .. hit the gas pedal and no acceleration at all ... I just spoke to the dealership service manager this morning ... he stated that hyundai is aware of an issue with the ignition coils ... and they had been told by hyundai to swap ignition coils ...( move them ) first .. hyundai corp is working on a fix he said .. I will be taking it back in this Monday Oct 21st... I will update my post once I hear back ... thanks Ron
 

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I actually got the downshift indicator last night for the first time in my life. I was going up a hill in 6th on the highway and hadn't shifted into 5th yet(I actually shifted into 4th as I was planning on accelerating). It was neat to finally see that. Also.. I got probably the loudest exhaust pop I've had when I dropped the clutch into 4th --- which was super satisfying lol.
I want to abuse my car just to see that indicator.
 

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Latest Update: My car is an automatic.. seven-speed dual-clutch automatic transmission.. The car can still accelerate even at 60 to 70 mph ... but the other day ...there was no power at all .. hit the gas pedal and no acceleration at all ... I just spoke to the dealership service manager this morning ... he stated that hyundai is aware of an issue with the ignition coils ... and they had been told by hyundai to swap ignition coils ...( move them ) first .. hyundai corp is working on a fix he said .. I will be taking it back in this Monday Oct 21st... I will update my post once I hear back ... thanks Ron
This is super interesting! Please do keep us posted because there have been two times I can think of where the engine seemed to not give me anything for a 1/4 to 1/2 a second despite the gear/rpms I was in ...both instances I was at 2750ish rpm and just assumed I should have been in a lower gear. I just chalked it up to not being used to turbos, and I'm only at 1300mi.

Good luck!
 

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This is super interesting! Please do keep us posted because there have been two times I can think of where the engine seemed to not give me anything for a 1/4 to 1/2 a second despite the gear/rpms I was in ...both instances I was at 2750ish rpm and just assumed I should have been in a lower gear. I just chalked it up to not being used to turbos, and I'm only at 1300mi.

Good luck!
I think everyone should get one of those Bluetooth ODB2 readers and a simple ECU scan app, some are even free. That way you can always check for errors and even clear them if need be. Paid off for me.
 

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Discussion Starter #11
Ordered this item:
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There's been occasional coilpack replacements for the 2.0 Nu engines, as well. Wonder if Hyundai uses the same coilpacks across engine families.
 

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1st post for me, but I bought an EGTN line in September, and had similar symptoms just before I hit 2100 miles. Turned out it was the boost sensor. My dealer had to order one, but once they had it, 45 mins drop off until I had my keys back in my hand. The car had been running in a failsafe mode for the couple of days between when it occured and when I could get it to the dealer.
 

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1st post for me, but I bought an EGTN line in September, and had similar symptoms just before I hit 2100 miles. Turned out it was the boost sensor. My dealer had to order one, but once they had it, 45 mins drop off until I had my keys back in my hand. The car had been running in a failsafe mode for the couple of days between when it occured and when I could get it to the dealer.
Did you have any engine light or other indicator that something was wrong?
 

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I just spoke to the dealership service manager this morning ... he stated that hyundai is aware of an issue with the ignition coils ... and they had been told by hyundai to swap ignition coils ...( move them ) first .. hyundai corp is working on a fix he said .. I will be taking it back in this Monday Oct 21st... I will update my post once I hear back ... thanks Ron
Thats for the 17-18 Elantra Sedans (AD/ADA) ONLY with the 2.0L NU. Per TSB: 19-FL-006H-1: If ANY P0300/301/302/303/304 codes arise. You do an ECM Update, and then put new coils in IF they have a White or Blue sticker on top.
 

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Did you have any engine light or other indicator that something was wrong?
CEL came on while going up a hill I drive everyday, I restarted the car while waiting for the light at the top of said hill to change, and cel went away, but power was still lacking for the rest of the day. CEL came back on during trip home and stayed on until dealer reset during 1st oil change @ 2100 miles. They over nighted the new sensor for me.
 

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Discussion Starter #17
@@@ Follow up to my previous post regarding loss of power when trying to accelerate at any speeds or gears (automatic) @@@@

Well the dealer ran tests on my vechicle ..only thing they did was swap 2 plugs and 2 ignition coils ..since it was getting misfire code .... I took it back for them to recheck and they said could not find anything wrong .. had hyundai customer service document the issue ..

.. I still have rough idle in the mornings for about 3 minutes ... I never had rough idle on any other hyundais when starting them in mornings ( including my previous 2012 turbo sonata) [email protected]@ was wondering if anyone else has noticed rough idle in the mornings ???
 

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@@@ Follow up to my previous post regarding loss of power when trying to accelerate at any speeds or gears (automatic) @@@@

Well the dealer ran tests on my vechicle ..only thing they did was swap 2 plugs and 2 ignition coils ..since it was getting misfire code .... I took it back for them to recheck and they said could not find anything wrong .. had hyundai customer service document the issue ..

.. I still have rough idle in the mornings for about 3 minutes ... I never had rough idle on any other hyundais when starting them in mornings ( including my previous 2012 turbo sonata) [email protected]@ was wondering if anyone else has noticed rough idle in the mornings ???
Cold starts are definitely rougher and will balance out in a few minutes. -- typically before I'm done my cigarette.
 

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Any update on this one? I've had what I think is the same issue since day 1. The car feels like it's leaning out around 3k when not so aggressively accelerating on the highway and other places.
I have it in and out of the shop for months. They've replaced coils, plugs and even the transmission. It's still happening and it's very difficult for the tech to duplicate it and they usually just give me the car back and look at me like an idiot. I'd like nothing more than to narrow down what's going on.
 

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I've had it back to 2 different dealers .. but they cant duplicate the issue .. and with no fault codes , except the first time it happened.. they dont try and test anything else .. snd due to these cars being so new on the market & so few in the US market, they (the dealers) dont have a lot to go on. I spoke to 1 service manager and he is going to check with Hyundai for me & will get back to me. FYI .. keep an eye on your tires .. he did say that these cars may have issues with tires cupping if tires are not rotated every 6k ..due to the smaller size of this model.
 
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