johannaweber1

Sonata Hybrid Transmission Problems

I'm having issues with my 2015 Hyundai Sonata Hybrid. The transmission seems to be acting up. Mileage is at 72405 km. Paddle shifters are completely unresponsive, the gearbox shifts really rough sometimes and it even slips. Sometimes I hear grinding noises. I also feel the paddle shifters are very slow when they work at all. Sometimes the gearbox even goes into emergency mode and stores an error.

A 2015 Hyundai Sonata Hybrid is experiencing transmission issues, including unresponsive paddle shifters, rough shifting, slipping, grinding noises, and emergency mode activation. The problem is suspected to be related to the transmission control unit (TCU), a known issue in similar models. Diagnosis confirmed a defective TCU, which was replaced, resolving the transmission problems.

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4 comment(s)

That sounds rough. I had some similar issues with my Sonata, though it's not a hybrid. Are you getting any error codes? Sounds like it could be electronic - possibly the transmission control unit. Given your symptoms, especially the emergency mode and error codes, it's definitely worth investigating the TCU. Have you done any diagnostics on it yet?

Thanks for the reply. You're right, my first guess was the TCU too, since the error code points in that direction. I was hoping it would be something simpler. Do you know if that's a common problem with the Sonata?

Unfortunately, yes, I believe it is. There have been a few reports of defective TCUs causing similar issues, especially in models from that era. It definitely sounds like the control unit is the issue. You will likely need to replace it. I suggest you get it looked at by a workshop to confirm the diagnosis. I had to cough up around 1000€ for the repair myself…

Thanks a lot for the info. I took it to the workshop, and you were right: defective TCU. Cost me about 1000€ to replace, but at least it's running smoothly now. Appreciate the help!

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HYUNDAI

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SONATA