r/Elantra

My mechanic and I are going absolutely crazy over this issue: my 2017 Elantra GL with 100k KM keeps stalls in stop and go traffic, when slowing down, when approaching a speed bump and when taking the foot off the gas pedal going uphill (aka slowing down).

So far we checked the air intake hose, all clear. Cleaned the throttle body, all clear. Changed the crankshaft monitor sensor. And the issue persists. Changed spark plugs, issue persists. Oil Change done at every 5-6k KM.

It doesn’t do it all the time, sometimes I can drive for a good 35 minutes in traffic before it happens. Sometimes it will happen 3-4 times on a 10 minute drive.

Anyone can point me in a direction? I’m tired of sinking money into this issue, love this car, been driving it for 7 years and I don’t want to change it because I’m kinda broke rn.

Would the Hyundai dealership have any better diagnostic tools or knowledge than my mechanic ? I kinda don’t trust them because they tried to fuck me at the buyback

I am also skeptical about road-tripping the car because of the high mileage but its been very reliable for me over 3 years and I have had basic maintenance done. What should I get checked before going on the ~700 mile roundtrip?

My subscription is expiring next week, and not sure if I want to continue for 300.00/year... Can someone share what might change within the Infotainment system without a subscription? I dont really use many of the app features other than an occasional send POI to car and the remote lock doors , but i can live without that. I assume all the standard radio and Lane assist and Driving assist etc and navigation stuff will work as expected. I do see the red light cameras is part of a subscription but other than that, anything else that will stop? My Driving seat and profile settings and avatar, do they go away too?

My wife’s 2023 Elantra limited randomly gets a low oil light and randomly looses acceleration and then doesn’t want to accelerate until she lets off on the gas a little bit it only happens on the highway. Has this happen to anyone before ?

Anyone here have done a lemon law claim with Hyundai over their horn issue? I have an Elantra and I notice most Elantras have this issue, Trying to gauge how the progress was for those claims and what ultimately was the solution. I almost gone into an accident as I couldn’t honk my horn while someone was trying to merge into the highway. I was slamming my brakes but having the horn working while I saw they were inching towards my lane would’ve helped too

I have a 2025 Hyundai Elantra Preferred, and I noticed the coolant level dropped below the “LOW” line. I went to Canadian Tire and PartSource to get coolant, but all the coolant they had labeled for Hyundai/Kia was yellow, while the coolant currently in my car is pink.

Now I’m confused about which one I’m actually supposed to use. I don’t want to mix the wrong coolant and cause issues.

Does anyone with a 2025 Elantra know which coolant is correct for this car?

2019 Hyundai Elantra Sport had basically no oil, now rattling even after refill. No warning light came on. Looking for advice/similar stories.

I have a 2019 Hyundai Elantra Sport with around 120k miles. I was due for an oil change, and recently the car started making a rattling noise. The noise was noticeable while driving and seemed to come and go at different speeds. It also sounded different when accelerating at higher RPMs.

I drove it to my mechanic, and they told me the car had basically no oil in it. They filled it with about 5 quarts of oil. After adding oil, the rattling became quieter than before, but it did not fully go away.

The weird/frustrating part is that I never got an oil warning light or any obvious warning before it reached this point. No oil pressure light came on that I noticed. The car also wasn’t obviously leaking oil onto the ground, so I’m wondering if it may have been burning oil or slowly consuming it.

The mechanic’s recommendation was basically to stop driving it and sell/trade it before I get stranded with a blown engine or need a full engine replacement. He said driving it more could make the situation worse.

A few details:

• 2019 Hyundai Elantra Sport
• Around 120k miles
• Was due for an oil change (Consistently getting them every 5-6k miles since I bought at 31k miles)
• Mechanic said it had basically no oil
• Took about 5 quarts to fill
• Rattling got quieter after oil was added but is still there
• No oil warning light came on
• No obvious oil puddle/leak
• Mechanic advised not to drive it anymore
• I’m currently considering selling it as-is rather than trying to repair it

Has anyone dealt with a 2017–2020 Elantra/Elantra Sport running extremely low on oil with no warning light? Did the rattle go away after an oil change, or did it end up needing major engine work?

At this point, I’m not trying to spend thousands chasing repairs unless there’s a realistic chance it’s something manageable. Any advice on whether this sounds like “sell it now” territory vs. worth diagnosing further would be appreciated.