AI Damage2020 Hyundai Sonata: common problems
Owners of the 2020 Hyundai Sonata filed 181 complaints with NHTSA, most often about fuel/propulsion system and electrical system. The maker issued 100 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 181
- involving a crash
- 5
- Technical service bulletins (TSB)
- 100
What fails most often
- 1 Fuel/propulsion system 26% of all complaints
- 2 Electrical system 22% of all complaints
- 3 Engine 18% of all complaints
- 4 Powertrain 13% of all complaints
- 5 Structure 9% of all complaints
- 6 Seats 9% of all complaints
- 7 Forward collision avoidance 7% of all complaints
- 8 Fuel system 7% of all complaints
- Fuel/propulsion system: 47 complaints (26% of all), 2 of them with a crash reported by the owner; manufacturer bulletins for this component: 4.
- Electrical system: 40 complaints (22% of all), 2 of them with a crash reported by the owner; manufacturer bulletins for this component: 24.
- Engine: 32 complaints (18% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 6.
- Powertrain: 24 complaints (13% of all); manufacturer bulletins for this component: 20.
- Structure: 17 complaints (9% of all); manufacturer bulletins for this component: 2.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 1.6 L · petrol · turbo · 4 cylnamed in 1 complaints
- 2.5 L · petrol · 4 cylnamed in 1 complaints
- 2 L · hybrid · 4 cyl
- automatic, 8-speed
- dual-clutch (DCT), 6-speed
Drive: FWD
Symptoms owners describe
How many of the 181 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Fuel/propulsion system | 47 | 2 | 4 |
| Electrical system | 40 | 2 | 24 |
| Engine | 32 | 1 | 6 |
| Powertrain | 24 | 0 | 20 |
| Structure | 17 | 0 | 2 |
| Seats | 16 | 0 | 0 |
| Forward collision avoidance | 12 | 2 | 1 |
| Fuel system | 12 | 0 | 0 |
| Steering | 7 | 0 | 9 |
| Visibility | 7 | 0 | 6 |
| Air bags | 7 | 1 | 2 |
| Vehicle speed control | 7 | 0 | 0 |
| Backover prevention | 6 | 0 | 0 |
| Service brakes | 4 | 1 | 5 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
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 .
The car has strong fuel smell in the cabin when tank is full, It is especially strong after car sits. I have taken to hyundai several times for this problem. They say the computer says nothing is wrong. They refuse to investigate as they dont smell the odor.
During these events, the engine began shaking, escalating to violent shaking; with deceleration and coming to a stop, it would shake, then sputter as if it would die. Coming to a complete stop, a total stall was prevented only by the ECM forcing a limp mode lock at 1200 RPMs.
A/C blower motor fan would stop working. Happened twice within less than a year apart. Upon further inspection, multi fuse wiring overheated and melted, ruining fuse and making A/C stop working during 100 temperatures outside. Apparently this is a well known issue with this make and model Sonata. Electrical failure.
The vehicle fails to recognize when the ignition is switched off, leaving core vehicle systems active and causing severe parasitic battery drain that leaves the car immobilized.
The A/C evaporator core and the core seal needs replacing on 2020 Hyundai Sonata. Car is 6 years old. I already have a confirmed diagnosis with a PPM refrigerant leak tester at the condensate drain line The diagnosis is 100% confirmed.
The reverse camera only shows a black screen and will put drivers in danger while not being able to see behind them while reversing. This needs to be recalled and repaired. Especially in situations where a person is reversing out of a driveway onto a major/busy road.
Windows fogged up inside which greatly reduced visibility. Checked the multifuse which controls the ABS, oil pump, cooling fan, & Blower. I discovered a burnt connection on one of the terminals for the blower. This is a huge safety and fire risk and needs to be addressed ASAP!!!!
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 364 of 2,102 model years in the NHTSA data (top 17% most complained about).
On average one model year of the Sonata has 236 complaints (11 years in the data). This year has 181, below average.
What to check before buying
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil…
Some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin outlines the combustion chamber cleaning procedure for vehicles diagnosed with this…
- Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil…
Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides the inspection and repair procedures for vehicles exhibiting this condition…
- The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and…
The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co…
- The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding…
The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety…
- Some 2019MY and newer vehicles equipped with a front view camera may illuminate certain warning lights and…
Some 2019MY and newer vehicles equipped with a front view camera may illuminate certain warning lights and trigger DTC C272246 fault code for the front camera. In the following cases, the front camera auto-calibration…
- Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System…
Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Engine Control Module, resulting in an illuminated Check Engine warning lamp. Follow the procedure…
- This bulletin provides information regarding condensation related to the accumulated moisture in the…
This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of…
- This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and…
This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system as described in this…
- This bulletin provides information related to the changes introduced in the 2024 2nd Navigation Map and…
This bulletin provides information related to the changes introduced in the 2024 2nd Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2024…
- Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink Service…
Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink Service functions. This may be due to an irregular disconnection on Verizon’s communication network. Follow the…
- Certain Sonata (DN8) and Sonata (DN8A) vehicles may experience issues with the air conditioning due to…
Certain Sonata (DN8) and Sonata (DN8A) vehicles may experience issues with the air conditioning due to damaged wiring in the engine room junction box. This bulletin provides instructions to replace the multi-fuse…
- Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU
Follow this bulletin to inspect the check valve, fuel pump cover and fuel tank, and update the ECU. If necessary, replace the check valve and/or fuel tank based on inspection results. The ECU Upgrade contains a revised…
NHTSA lists 100 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Hyundai Sonata?
Owner complaints to NHTSA most often mention: fuel/propulsion system, electrical system, engine. Total complaints: 181. The most frequent symptoms in complaint texts: warning lights, check engine (29%), fuel system, fuel smell (9%), A/C or heater (8%).
How many service bulletins (TSB) were issued for the 2020 Hyundai Sonata?
NHTSA lists 100 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Hyundai Sonata from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.