The vehicle dossier US · 2021
2021 Hyundai
SONATA HYBRIDProblems & recalls
55 distinct owner reports in the NHTSA snapshot. Electrical system appears in 25 of them. Explore what was reported—and which official actions are on file.
01 / Owner-reported evidence
What owners reported.
Categories attached to 55 distinct reports. A report can mention more than one component, so category totals can overlap.
See original component labels
These are reports made to NHTSA, not verified diagnoses. More reports can reflect more vehicles, more time on the road, or greater reporting activity.
The reporting timeline
When reports arrived.
Reports by year filed, not by the year a problem occurred. Showing the latest 5 years with reports.
28,273 miles is the median among 2 reports with usable mileage. The middle half spans 24,000–24,000 miles.
This describes the submitted reports. It does not predict when a vehicle will fail.
02 / Official safety campaigns
0 recall campaigns on file.
A campaign can cover only certain production dates or configurations. The count does not tell you whether an individual car has an open recall.
03 / The manufacturer’s record
Instructions. Updates. Responses.
48 distinct communications list this model-year. Showing the latest 12. A matching model-year does not establish that every engine, trim or reported symptom is covered.
DTN DLThe 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., Ltd. (DTN…NHTSA ID 11032523
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., Ltd. (DTN). These inflators were not supplied, approved, or authorized by the vehicle manufacturers and have primarily been found in vehicles that previously experienced a crash and underwent airbag replacement using non-genuine parts. These dangerous inflators have ruptured during deployment, posing a serious risk of injury or death due to metal fragments entering the vehicle cabin. To date, Hyundai is aware of three people who have died while driving a Hyundai vehicle with one of these substandard replacement airbag inflators that deployed in what likely would have been a survivable crash. NHTSA has issued a public advisory urging vehicle owners and service professionals to have vehicles inspected if there is reason to believe that a non-genuine replacement airbag may have been installed. Vehicles with salvage or rebuilt titles, prior airbag deployments, or unknown repair histories may present a higher risk. NHTSA strongly cautions against self-inspection by vehicle owners and recommends inspection by trained technicians.
Components: AIR BAGS. Confirm detailed applicability in the original document.
Source record 11032523 at NHTSADTN DCSThe 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 System Co.…NHTSA ID 11032522
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 System Co., Ltd. (DTN), that have been identified in U.S. vehicles following prior crashes, theft, or non‑certified airbag replacements. These inflators are not approved for use, may rupture during deployment, and have caused serious injuries and fatalities. Please see attached announcement, provided by NHTSA, for more details.
Components: AIR BAGS. Confirm detailed applicability in the original document.
Source record 11032522 at NHTSA25-EM-007H TSBSome Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated Thermal-Management M…NHTSA ID 11027036
Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated Thermal-Management Module (ITM). Follow the service procedure in this bulletin to install a spring onto the thermostat within the ITM, in order to prevent premature opening, and perform an ECU software update on affected vehicles.
Components: ENGINE. Confirm detailed applicability in the original document.
Source record 11027036 at NHTSA25-BD-012H TSBThis 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 condensat…NHTSA ID 11025476
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 condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes or during normal driving operation.
Components: EXTERIOR LIGHTING. Confirm detailed applicability in the original document.
Source record 11025476 at NHTSA25-BE-020H TSBThis 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 TSB.NHTSA ID 11023692
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 TSB.
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11023692 at NHTSA25-01-010H-1 9B4 OLCertain Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.NHTSA ID 11022097
Certain Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.
Campaign / software reference: 9B4
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11022097 at NHTSA25-01-010H-1 DNCertain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles may exhibit a warning light due to DTC Code P1BB20 (12V Lithium Battery Cell Voltage High). The California Air Resources Board has …NHTSA ID 11020799
Certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles may exhibit a warning light due to DTC Code P1BB20 (12V Lithium Battery Cell Voltage High). The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
Campaign / software reference: 9B4
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11020799 at NHTSA25-01-010H-1 TSBThis bulletin provides the procedure to update the software for the Battery Management System (BMS) on certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles that may exhibit a warning l…NHTSA ID 11020798
This bulletin provides the procedure to update the software for the Battery Management System (BMS) on certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles that may exhibit a warning light with DTC P1BB200 and enter Limp Mode.
Campaign / software reference: 9B4
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11020798 at NHTSA25-BE-002H TSBThis 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 2nd Naviga…NHTSA ID 11018876
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 2nd Navigation Map and Software Update Improvements section in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater (NAU) and updated by USB. The NAU website is https://update.hyundai.com/US/EN/navigationUpdate. For certain models equipped with a relevant Bluelink package, the software may be downloaded and applied via OTA update.
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11018876 at NHTSA25-01-024H-1 TSBSome 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 procedure in this…NHTSA ID 11018575
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 procedure in this TSB to reestablish the connection via the AVN pinhole reset method.
Campaign / software reference: 9C1
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11018575 at NHTSA25-01-024H EMSome 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. If you are experiencing issu…NHTSA ID 11017111
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. If you are experiencing issues with remote commands, or other Bluelink services, please see the instructions below to reestablish the connection via the AVN pinhole reset method.
Campaign / software reference: 9C1
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11017111 at NHTSA25-01-024H TSBSome 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 procedure in this…NHTSA ID 11015936
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 procedure in this TSB to reestablish the connection via the AVN pinhole reset method.
Campaign / software reference: 9C1
Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.
Source record 11015936 at NHTSARecords below contain the NHTSA bulk summary unless a document-reviewed explainer is linked. A service bulletin is not a safety recall or a promise of a free repair. Records may be revised or superseded; verify the current document with the manufacturer.
04 / Agency investigations
Official inquiries.
An investigation is an inquiry into a potential concern. Its presence does not establish a defect, and a closed case does not certify a car’s condition.
Pedestrian alert soundsDP22005
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matter described in the petition. On June 24, 2023 and as supplemented on June 25, 2023, the petitioner notified NHTSA he was withdrawing his petition. The petitioner indicated that, based on his review of data, there is no justification for asserting potential benefits that could be derived from actions sought by my petition. Based on the petitioner's withdrawal, DP22-005 is closed. Closure of this DP does not represent a determination by NHTSA regarding the subject matter of the petition.
Recorded closure: Aug 7, 2023
Campaign reference in the source: 22V063000
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