Hyundai · Known Issues
2020 Hyundai Sonata Problems: 6 Known Issues
2020 model year · 1,660+ owner reports · Updated September 2026
2020 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2020 model year · 1,660+ owner reports · Updated September 2026
2020 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 1,660+ owner reports, the 2020 Hyundai Sonata has 6 documented known issues, with 1 rated critical. The most serious is No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft ($0-$900 repair). The most commonly reported issue is A/C Compressor Failure with 720 owner reports. Across all issues with published estimates, repair costs range from $100 to $1,400. DIY maintenance guides at au7o.io.
AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE
Hyundai Motor Company (Hyundai) is recalling certain model year 2017 Hyundai Elantra vehicles manufactured April 15, 2016, to September 13, 2016, and Sonata vehicles manufactured May 27, 2016 to September 16, 2016. In these vehicles, the end seal for the driver's frontal air bag inflator may not have been properly installed, possibly resulting in reduced inflation of the frontal air bag in the event of a crash.
EXTERIOR LIGHTING:TURN SIGNAL
Hyundai Motor America (Hyundai) is recalling certain 2015-2017 Sonata, 2016-2017 Sonata Hybrid, and Sonata Plug-In Hybrid vehicles. The Smart Junction Box (SJB) software logic may not properly interpret the signals received from the multifunction switch, which could cause the turn signal to activate in the opposite direction of what the driver intended.
POWER TRAIN:AUTOMATIC TRANSMISSION
Hyundai Motor Company (Hyundai) is recalling certain 2021-2022 Santa Fe, Sonata, Veloster N, 2022 Santa Cruz, Elantra N, and Kona N vehicles. The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
According to Au7o's analysis of 1,660+ owner reports, the 2020 Hyundai Sonata has 6 documented issues. The most frequently reported are: No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft, A/C Compressor Failure, Theta II GDI excessive oil consumption. Of these, 1 is rated critical and should be addressed promptly.
The 2020 Hyundai Sonata has 6 known issues documented across 1,660+ owner reports. 1 issue is rated critical: No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Hyundai Sonata issues range from $0 to $1,400, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, No Engine Immobilizer on Turn-Key Trims Enabling USB-Cable Theft, typically costs $0-$900 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Sonatas built without a push-button start system were sold in the US without an engine immobilizer, meaning the starter and ignition can be operated with a stripped steering column and a USB plug rather than a coded key. The technique was spread on TikTok from 2021 by the 'Kia Bo… Repairs typically run $0-$900. Severity: high.
The A/C compressor can fail, particularly on vehicles in hot climates with heavy A/C use. Internal compressor failure can contaminate the A/C system. Clutch and bearing failures are also common. Repairs typically run $500-$1,400. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
Hyundai Motor America (Hyundai) is recalling certain 2021-2022 Santa Fe and Sonata vehicles equipped with 2.5L turbocharged engines. Fuel may leak at the pipe connection between the high-pressure fuel pump and fuel rail.
LATCHES/LOCKS/LINKAGES:TRUNK LID:LATCH
Hyundai Motor America (Hyundai) is recalling certain 2017-2018 Sonata, 2016-2018 Sonata Hybrid, 2018-2020 Accent, and 2016-2017 Azera vehicles. The trunk latch may become damaged, preventing the opening of the trunk from the inside. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 401, "Internal Trunk Release."
+ 5 more recalls. Check all on NHTSA.gov
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Hyundai TSB 23-EM-008H provides inspection and repair guidance for gasoline-engine vehicles with oil-consumption concerns. Its engine and labor tables specifically include model-year 2011-2014 Sonata 2.4-liter GDI and 2.0-liter turbo-GDI applications and model-year 2015-2020 Sona… Severity: medium.
The plastic base of the trunk latch can be damaged in service, allowing the internal emergency trunk release handle to fail to open the lid from inside - a direct noncompliance with FMVSS 401, 'Internal Trunk Release', which exists so a person (typically a child) trapped in the t… Repairs typically run $0-$250. Severity: medium.
The infotainment system can freeze, become unresponsive, or experience connectivity issues. Bluetooth pairing problems, navigation crashes, and touchscreen lag are common complaints. Repairs typically run $0-$800. Severity: low.
Some Sonata owners experience unexplained battery drain, resulting in a dead battery after sitting for several days. Various electronic modules may not go to sleep properly. The smart key system can also contribute to drain. Repairs typically run $100-$500. Severity: low.