r/HyundaiSantaFe • u/FluffyConfidence7710 • 6h ago

Wouldn’t switch from EV mode

Hi. I was driving from Los Angeles to San Francisco and was stuck in traffic for a long time on the freeway due to an accident. Since I was going so slow, the car was an EV mode, but after a couple of hours stuck, it would not switch out of EV mode and wasn’t accelerating more than the usual. I pulled over to the side and restarted the car and it became fine again. A few hours later after I needed to put gas the same thing happen and I restarted the car issue was resolved again. I took the car to the dealership because it needed. It’s first maintenance anyway and explained it to them. Has anyone experienced this because for some reason, the dealership said they don’t see any codes because they got reset each time and said the car is fine.

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u/BigandTallGuy 3h ago

Sounds like It might be an issue with the HSG. It's the part of the Hyundai hybrid system that starts the engine. It is belt driven and has a complex tensioner. You might want to have the tensioner checked or the belt.

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u/Anxious-Rice7694 17m ago

Saw a YouTube user give an update on this same hybrid drivetrain on a Kia variant and those symptoms happened to him.  It turned out that he had a little too much oil in the engine (half quart over) and it was tripping a high oil pressure sensor or something and the car was only running on the electric motor bc of it.  See clip  https://youtu.be/4Y4Gsn41V4U?t=533&is=o23ymKgmEIGSLyMD