9.9

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
140 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.

2020 Hyundai Sonata engine problems

engine problem

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2020 Hyundai Sonata Owner Comments

problem #5

Jan 302024

Sonata

  • miles

A D V E R T I S E M E N T S

While driving at about 45mph a warning flashed on my dash. I couldn't read it before it disappeared, but it was something about front collision., contact dealer. the car immediately lost all power. Everything was still running, but I had no acceleration. I had to back down a busy road into a vacant lot. I had just come off of the highway when this happened, if I had still been driving on the Highway, I would have been hit by a car from behind, since there was no warning at all. The car was towed to a Hyundai dealership. After a diagnosis, it was said to be the Throttle body. I had to wait for the repair because the part was on back order. I was told that there was another car there waiting on the same part. I am afraid to drive the car now, even though the repair was made. I feel this is a safety hazard, and that someone could be injured or killed because of this issue with the car.

- Cottonwood, CA, USA

problem #4

Aug 272023

Sonata

  • miles
malfunction cause unanticipated acceleration in sport driving mode.

- Portsmouth, NH, USA

problem #3

Aug 042022

Sonata

  • miles
When accelerating hard (pedal to the floor) from approximately 55 mph, the transmission may not downshift correctly and loses power causing a safety issue. When attempting to continue accelerate at full throttle, the RPMs hang while simultaneously losing vehicle speed. Other symptoms noticed were slight vehicle jerkiness from RPMs bouncing up and down a couple of hundred RPMs. When letting off of the accelerator to a "normal" depression level, the vehicle upshifts into an appropriate gear and will gain speed (though sluggish). In the same drive (meaning the ignition was not turned off then back on), if attempting to push accelerator to the floor, the same results happen as stated before. Also in the same drive (after exiting the highway), from a stop at a red light I tested the issue again with the same results. No warning lights, messages, or other symptoms were present to indicate a malfunction. My safety was at risk because I merged onto the highway and noticed another vehicle approaching me at an unsafe pace. Due to the issue, the car had to hit their brakes hard to avoid a crash. This is also a safety risk because if it happens from a stop, the car may fail to accelerate appropriately when turning in front of traffic. The problem has not be reproduced, confirmed or inspected by anyone besides myself. A video of the issue as it occurred was recorded. This issue is not consistent and has happened twice in approximately 3 months. My Hyundai dealership's service department suggested the car may have went into "limp mode." Given the inconsistent nature of the issue, I did not schedule an appointment to have it looked at because I would have been charged if nothing was found.

- Cuyahoga Falls, OH, USA

problem #2

Jun 062021

Sonata

  • miles
Driving, car started making a weird sound followed by a warning light on dashboard with dinging sound to correlate... car became difficult to gas, vehicle motion was lagging where I just knew I had to pull over Bc this car was going to literally stop began to slowly (Bc that-??s all car would allow) to proceed forward and I was forced to come to a haunt as I pulled onto side of highway. I then could no longer move it. Turned car off for minute then returned to try to start again, car would not accelerate at all nor turn on fully.. I was forced to wait hour to get a tow... took to shop, no problem such was found, car started & ran again... this is 3 days later the car again continued the same exact pattern & I was unable to drive any further and forced to once again to get tow. This has to be something of bearings with engine, this car mode is not on list but IT certainly is an issue that I believe is related & should be rectified by Hyundai.

- Islip Terrace , NY, USA

problem #1

Oct 112020

Sonata

  • 700 miles
Message on instrument panel stated'collision avoidance system was disabled and radar was blocked.the electric power steering also began to function erratically and a steering wheel symbol appeared and kept changing color from green to white.this happened after driving approximately 400 miles from the dealer in NJ to charlotte nc.mileage is 975.

- Dover, NJ, USA

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