Notes: The 2011 Sonata has a seriously defective engine that seizes without warning. It was awarded the dubious honor of being the first CarTalk / CarComplaints Turd of the Week in late September 2015.

A class action lawsuit was filed in May 2015 against Hyundai that claims the 2.4L Sonata engine is defective. More info here.


really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
4 / 0
Average Mileage:
8,816 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2011 Hyundai Sonata transmission problems

transmission problem

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2011 Hyundai Sonata Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #2

Nov 082010


  • 2,121 miles


I was driving my 2011 Hyundai Sonata SE. I was traveling at 45 mph when the car shuttered made a loud "clunking" noise and downshifted into 4th gear. Car would then fail to shift into 5th or 6th gear. Would not accelerate to highway speeds. I had the car towed to the dealer. They could not replicate the problem but did find code dtc PO0748. The dealer replaced the transmission at the manufactures direction. The vehicle was one month old and had 2121 miles on it.

- Orlando, FL, USA

problem #1

Sep 102010


  • 200 miles
While driving my new 2011 Hyundai Sonata gls sedan with 200 miles on the odometer, the transmission failed completely when a transmission hose blew off releasing all the oil out of the transmission. Once at the dealership they showed me that hose clamp for the hose had never been attached correctly at the factory! the car is at the dealership for repairs. It is not know at this time if the transmission has been damaged due to the loss of oil. We were not hurt and didn't lose control of the car. This incident occurred on a flat piece of highway, should it occurred in hilly terrain or passing another vehicle the results could have been much different since the car became inoperable. Very disappointing since the car had only 200 miles on it!

- Livonia, NY, USA

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