Gas Recirculation Valve (egr Valve) problems of the 2020 Hyundai Sonata

While stopping at a major highway intersection on [xxx] for a red light vehicle stalls and will not start back up while everyone else continues at a 55 mph mile an hour passing me on each side! this happened more than 6 times . While you’re stuck in intersection,you have to keep trying to start the car eventually it will start . Apparently it is egr valve and is a very common problem. It is noted in the common problem for this year making model and the repair cost is in the range of $1600 even the dealership said it is a very common problem. They have been experiencing it. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I noticed a strange smell almost like burning maple syrup in the garage for months. I thought it was just a different smell from hybrid cars as I didn't have this used car very long. While driving at times the acceleration would stutter, again I thought this was just expected having never driven a hybrid car. Then on a trip a couple hours out of town someone stopped me on the road to tell me I was burning antifreeze and he could see white smoke coming from the car. I pulled over and didn't notice anything and continued driving but the heater wasn't working, it was blowing cool air despite the heat being on. I pulled into an auto parts store and got antifreeze in case. And then the overheating alert came on. I waited and filled it up and made an appointment at the dealer. They diagnosed it as a a blown gasket and a bad catalytic convertor and replaced all of that. After bringing it home I continued to lose coolant even with a two mile ride, I went from max fill to half way between max and min. Clearly the problem wasn't the gasket or the catalytic convertor. Others have shared similar experiences online and had to have many parts replaced. The coolant tank, the egr cooler (?), etc. I don't know what the problem is but something is wrong with these cars.

I have had the same issue 3 separate times related to the coolant system. The first time happened January 2021. I was driving on the highway and I noticed that when the car switched from electric to fuel a large plume of white smoke came out of the exhaust and then the engine overheating message started. I checked the coolant tank and it was completely empty. I managed to get some coolant in the car and get to my destination. I checked the coolant tank again and all the coolant that had been put in was gone. I immediately had the car towed to the dealer. They found the issue was a leak near the muffler and eventually replaced that and other gaskets. In may 2022, I noticed again that when I switched from battery to fuel on acceleration that there was a plume of smoke coming out of the exhaust and my coolant was very low. Brought to the dealer and they confirmed again there was a leak but this time with the egr cooler and associated parts. In December 2022, I had just gotten an oil change from the dealer and they gave me a clean check up. The next evening I was on the highway again and I received the engine overheating message. I was able to get to the dealer the next morning after refilling the coolant twice. I provided them with the previous paperwork from the other two fixes. They confirmed again that the leak was happening with the muffler so they replaced more parts. In all I have for over 3 months fixing the same issue. . Read more...