2021 Hyundai Sonata service bulletins & manufacturer communications

88 manufacturer communications are on file with NHTSA for the 2021 Hyundai Sonata. TSBs are repair guidance for dealers — they are not recalls, and repairs are not automatically free.

• This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT). The…
  26-AT-005H TSB · Technical service bulletin · Power Train · issued Jun 5, 2026
• Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter magnetic switch for potential freezing a…
  26-EE-003H TSB · Technical service bulletin · Engine · issued Apr 18, 2026
• The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by Jilin Province De…
  DTN DL · Technical service bulletin · Air Bags · issued Apr 10, 2026
• The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by Jilin …
  DTN DCS · Technical service bulletin · Air Bags · issued Apr 10, 2026
• Some Santa Cruz (NXT), Santa Fe (TMA, MX5A), and Sonata (DN8A) models may require replacement of the 8-speed wet dual clutch transmission (8WDCT) when the vehicle sets one of the h…
  26-AT-001H TSB · Technical service bulletin · Power Train · issued Mar 3, 2026
• 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 cas…
  26-AD-001H TSB · Technical service bulletin · Forward Collision Avoidance · issued Feb 25, 2026
• 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 Eng…
  26-EM-003H TSB · Technical service bulletin · Engine · issued Feb 5, 2026
• Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI fuel injectors leaking internally. This may be caused by int…
  26-FL-001H TSB · Technical service bulletin · Fuel/propulsion System · issued Jan 7, 2026
• 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 …
  25-BD-012H TSB · Technical service bulletin · Exterior Lighting · issued Nov 6, 2025
• 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 …
  25-BE-020H TSB · Technical service bulletin · Electrical System · issued Sep 30, 2025
• Certain Santa Fe (TMA) and Sonata (DN8/DN8A) vehicles equipped with 8-speed dual clutch transmissions (8DCT) may exhibit one of the DTCs listed below, related to the high pressure …
  25-AT-001H TSB · Technical service bulletin · Power Train · issued May 30, 2025
• 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 …
  25-BE-002H TSB · Technical service bulletin · Electrical System · issued May 16, 2025
• 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 comm…
  25-01-024H-1 TSB · Service campaign · Electrical System · issued May 8, 2025
• 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 instru…
  25-EE-002H · Technical service bulletin · Engine · issued Apr 30, 2025
• 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 instru…
  25-EE-002H TSB · Technical service bulletin · Electrical System · issued Apr 25, 2025
• 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 comm…
  25-01-024H EM · Service campaign · Electrical System · issued Apr 7, 2025
• 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 comm…
  25-01-024H TSB · Service campaign · Electrical System · issued Mar 18, 2025
• Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI injectors leaking internally. This may be caused by internal…
  25-FL-001H · Technical service bulletin · Fuel/propulsion System · issued Jan 9, 2025
• 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 f…
  25-01-001H TSB · Service campaign · Fuel/propulsion System · issued Jan 3, 2025
• Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 (also known as DTC P14EE00) stored in the Electronic Control Un…
  25-01-001H DBP · Service campaign · Fuel/propulsion System · issued Jan 3, 2025
• The subject vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the ECU, which could cause the Check Engine Lamp to come on.
  9B1 OL · Service campaign · Electrical System · issued Dec 10, 2024
• Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the Electronic Control Unit (ECU). The California Air…
  24-01-020H DBP · Service campaign · Fuel/propulsion System · issued Nov 14, 2024
• 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 f…
  24-01-020H TSB · Service campaign · Fuel/propulsion System · issued Nov 14, 2024
• Certain 20-22MY Sonata (DN8a), 21-23MY Santa Fe (TMa), and 22-23MY Tucson (NX4a) vehicles may experience a warning lamp illumination for a diagnostic trouble code P2181 that is rel…
  24-EM-001H · Technical service bulletin · Engine · issued Jul 23, 2024
• Some vehicles equipped with the AVN 5th Gen Wide system may exhibit a condition where the radio app crashes frequently when entering radio mode and/or displays a message that reads…
  24-BE-001H-1 · Technical service bulletin · Electrical System · issued Jul 19, 2024
• This TSB provides a procedure to diagnose and replace, if necessary, an automatic transmission with Incorrect Ratio DTC (transmission clutch slip in gear above limit) listed on Pag…
  24-AT-002H · Technical service bulletin · Power Train · issued Apr 9, 2024
• This bulletin provides the procedure to update the Engine Control Module (ECM) and/or the Transmission Control Module (TCM) for 2020-2023MY Sonata (DN8/DN8a) vehicles to improve op…
  24-FL-002H · Technical service bulletin · Engine and Engine Cooling · issued Feb 29, 2024
• This bulletin provides the procedure for updating the automatic transmission TCU and ECU software (Santa Fe ONLY) to improve shift quality, judder with ISG enabled and hesitation w…
  24-AT-001H · Technical service bulletin · Power Train · issued Feb 28, 2024
• This bulletin contains information about the proper removal of the windshield wiper blade protective cover on all models. If the protective cover is not removed correctly, there is…
  24-BD-001H · Technical service bulletin · Visibility/wiper · issued Feb 14, 2024
• Some vehicles equipped with the AVN 5th Gen Wide system may exhibit a condition where the radio app crashes frequently when entering radio mode and/or displays a message that reads…
  24-BE-001H · Technical service bulletin · Electrical System · issued Jan 10, 2024
• This TSB provides information to diagnose the push button shifter operation.
  23-AT-006H-2 · Technical service bulletin · Power Train · issued Nov 10, 2023
• This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
  23-EM-005H · Technical service bulletin · Engine and Engine Cooling · issued Oct 13, 2023
• This bulletin is issued to provide the extended battery diagnosis procedure using GDS-M. This battery diagnosis function displays the various battery-related faults such as: â ¢ In…
  23-EE-010H · Technical service bulletin · Engine and Engine Cooling · issued Sep 18, 2023
• If you are servicing an 8-speed front-wheel-drive vehicle equipped with automatic transaxle with one or more of the DTC or symptoms listed below, refer to the Service Procedure to …
  23-AT-008H-1 · Technical service bulletin · Power Train · issued Sep 14, 2023
• This bulletin outlines changes to the service procedure regarding the replacement of 8-speed wet dual clutch transmissions (8WDCT) and associated transmission control unit (TCU). T…
  23-AT-011H · Technical service bulletin · Power Train · issued Aug 28, 2023
• This bulletin provides information related to a Transmission Control Unit (TCU) software update for certain vehicles equipped with an 8-speed wet dual clutch transmissions (8WDCT) …
  23-AT-012H · Technical service bulletin · Power Train · issued Aug 28, 2023
• If you are servicing an 8-speed vehicle with a â Check Engineâ light on and one or more of the DTC listed, follow the service procedure and replace the related solenoid and harness…
  23-AT-003H-1 · Technical service bulletin · Power Train · issued Aug 25, 2023
• This bulletin provides warranty procedure for EGR Valve replacement related to DTC P0401 EGR Flow Insufficient on 2020 and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles.
  23-EE-009H · Technical service bulletin · Engine and Engine Cooling · issued Aug 21, 2023
• This TSB provides information to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms listed below or DTCs (listed on Page 2) , follow the S…
  23-AT-006H-1 · Technical service bulletin · Power Train · issued Aug 1, 2023
• If you are servicing an 8-speed DCT front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition. â ¢ DIAGNOSTIC TROUBL…
  23-AT-009H · Technical service bulletin · Power Train · issued Jul 18, 2023
• This Service Information bulletin provides information on how to update the Apple Carplay software from Hyundaiâ s Navigation Updates page. The current version of Google Maps has 1…
  23-BE-007H · Technical service bulletin · Equipment · issued Jul 17, 2023
• If you are servicing an 8-speed front-wheel-drive vehicle equipped with automatic transaxle with one or more of the DTC or symptoms listed below, refer to the Service Procedure to …
  23-AT-008H · Technical service bulletin · Power Train · issued Jul 11, 2023
• This bulletin provides the diagnostic procedure for the GDI injector(s) in certain 21-23MY Sonata, 21-22MY Santa Fe, certain 22MY Santa Cruz, and certain 21-23MY Tucson equipped wi…
  23-FL-002H-1 · Technical service bulletin · Engine and Engine Cooling · issued Jun 9, 2023
• This bulletin provides service procedures to prevent possible moisture intrusion of the HP EOP (High Flow Electric Oil Pump) connector when servicing the 8-speed wet dual clutch tr…
  23-AT-002H · Technical service bulletin · Power Train · issued May 10, 2023
• This TSB applies only if Recall 236 or Service Campaign T8N has been performed and the 8 speed wet dual clutch transmission (8WDCT) replacement is necessary related due to high pre…
  23-AT-004H · Technical service bulletin · Power Train · issued May 9, 2023
• Hyundai applies a Paint Protection Film (PPF) on new vehicles before delivery to dealerships. It provides a barrier between the paint and contaminants, such as rail dust, acid rain…
  23-BD-007H · Technical service bulletin · Structure · issued Apr 24, 2023
• This bulletin provides the procedure to repair poor pin tension at joint connector JE102 in certain Sonata (1.6 T-GDI engine) with one or more DTC.
  23-EE-005H · Technical service bulletin · Engine and Engine Cooling · issued Apr 7, 2023
• This bulletin provides the procedure to repair poor pin tension at joint connector JE202 in certain Sonata (2.5L GDI engine) with one or more DTC.
  23-EE-006H · Technical service bulletin · Engine and Engine Cooling · issued Apr 7, 2023
• If you are servicing an 8-speed vehicle with a â Check Engineâ light on and one or more of the DTC listed, follow the service procedure and replace the related solenoid and harness…
  23-AT-003H · Technical service bulletin · Engine and Engine Cooling · issued Apr 6, 2023
• This bulletin provides the diagnostic procedure for the GDI injector(s) in certain 21-23MY Sonata, 21-22MY Santa Fe, certain 22MY Santa Cruz, and certain MY21-23 Tucson equipped wi…
  23-FL-002H · Technical service bulletin · Engine and Engine Cooling · issued Mar 23, 2023
• 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 …
  23-BD-002H · Technical service bulletin · Visibility · issued Jan 30, 2023
• Some 2021 ~ 2022MY Sonata (DN8/DN8a) vehicles with N-Line trim may not engage Forward Collision Avoidance Assist â Junction Turning (FCA-JT) due to omitted logic.
  23-01-002H · Technical service bulletin · Forward Collision Avoidance · issued Jan 12, 2023
• This bulletin outlines changes to the service manual regarding the replacement of 8-speed dual clutch transmissions (DCT) and associated transmission control module (TCM). Addition…
  22-AT-011H · Technical service bulletin · Power Train · issued Oct 31, 2022
• This bulletin provides the diagnostic procedure for the GDI injector(s) in certain 21-22MY Sonata, Santa Fe, and certain 22MY Santa Cruz, and Tucson equipped with 2.5L GDI engines …
  22-FL-002H · Technical service bulletin · Engine and Engine Cooling · issued Oct 13, 2022
• This bulletin provides the procedure to update the TCU software to improve drivability and shift quality.
  22-01-059H · Technical service bulletin · Power Train · issued Aug 16, 2022
• Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly…
  22-EM-010H · Technical service bulletin · Engine and Engine Cooling · issued Jul 28, 2022
• Effective June 2, 2008, Federal Motor Vehicle Safety Standard 110 (FMVSS 110) established a threshold for correcting load carrying capacity information indicated on tire placards w…
  22-GI-006H · Technical service bulletin · Tires · issued Jul 14, 2022
• If you are servicing an applicable vehicle with a â Check Engineâ light on and one or more of the DTC listed on Page 2, follow the repair procedure and perform the diagnosis. If ne…
  22-AT-009H · Technical service bulletin · Power Train · issued Jul 14, 2022
• Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulle…
  218/231 amend · Technical service bulletin · Steering · issued Jun 3, 2022
• If you are servicing an applicable vehicle with a â Check Engineâ light on and one or more of the DTC listed below, follow the repair procedure and replace the related solenoid and…
  22-AT-005H · Technical service bulletin · Power Train · issued Apr 28, 2022
• Certain 2020-2022MY Sonata (DN8A) vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow t…
  22-ST-003H · Technical service bulletin · Steering · issued Apr 8, 2022
• Certain vehicles equipped with 8-speed automatic transmission may experience an automatic transmission fluid (ATF) leak at the rear cover. This type of leak is caused by a porous c…
  22-AT-002H · Technical service bulletin · Power Train · issued Mar 9, 2022
• Certain 2020-22MY Sonata (DN8a) and 2021-22MY Santa Fe (TMa) vehicles equipped with 2.5L engine may exhibit a MIL with DTC(s): â ¢ P2074: Mass Airflow Sensor Plausibility â ¢ P2074…
  22-01-018H · Technical service bulletin · Engine and Engine Cooling · issued Feb 3, 2022
• This TSB provides a procedure to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms or DTC listed below, follow the Service Procedure, Pag…
  22-AT-001H · Technical service bulletin · Power Train · issued Jan 21, 2022
• Certain vehicles listed below equipped with 2.5T turbo engines may have a misassembled check valve for the PCV (Positive Crankcase Ventilation) system, resulting in engine oil ente…
  21-EM-012H · Technical service bulletin · Engine and Engine Cooling · issued Dec 22, 2021
• Certain 2020-22MY Sonata (DN8a), 2021-22MY Santa Fe (TMa), and 2022MY Tucson (NX4/NX4a) vehicles equipped with 2.5L engine may exhibit a MIL with DTC(s): â ¢ P2074: Mass Airflow Se…
  21-01-075H · Technical service bulletin · Engine and Engine Cooling · issued Dec 9, 2021
• Certain 2020-2021 Sonata (DN8a) vehicles with 1.6T engines may exhibit a check engine light in conjunction with a popping noise, abnormal smell from the engine compartment, rough r…
  21-EM-010H-1 · Technical service bulletin · Engine and Engine Cooling · issued Nov 8, 2021
• Certain Sonata N-Line vehicles may have an uneven appearance between LH and RH exhaust tips due to slightly misaligned rear mufflers. This bulletin describes the procedure to adjus…
  21-EM-011H · Technical service bulletin · Engine and Engine Cooling · issued Oct 29, 2021
• : Certain vehicles equipped with 8-speed automatic transmission may experience an automatic transmission fluid (ATF) leak at the rear cover. This type of leak is caused by a porous…
  21-AT-017H · Technical service bulletin · Power Train · issued Oct 11, 2021
• Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulle…
  21-ST-003H · Technical service bulletin · Steering · issued Oct 1, 2021
• Certain 2020-2021 Sonata (DN8a) vehicles with 1.6T engines may exhibit a check engine light in conjunction with a popping noise, abnormal smell from the engine compartment, rough r…
  21-EM-010H · Technical service bulletin · Engine and Engine Cooling · issued Sep 30, 2021
• This TSB provides a procedure to diagnose the push button shifter operation.
  21-AT-009H · Technical service bulletin · Power Train · issued Jul 13, 2021
• This bulletin provides information related to an Electronic Control Module (ECM) software update which revises the OBD Air Fuel Ratio Imbalance (AFRI) monitor function frequency an…
  21-01-051H · Technical service bulletin · Engine and Engine Cooling · issued Jun 22, 2021
• If you are servicing an 8-speed front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition. ï · DIAGNOSTIC TROUBLE CO…
  21-AT-007H · Technical service bulletin · Power Train · issued Jun 14, 2021
• This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance T…
  21-EM-004H · Technical service bulletin · Engine and Engine Cooling · issued Mar 30, 2021
• This bulletin provides best practice recommendations when performing brake service procedures.
  21-BR-002H · Technical service bulletin · Equipment · issued Mar 23, 2021
• This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.
  21-EM-003H · Technical service bulletin · Engine and Engine Cooling · issued Mar 10, 2021
• This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.
  21-BE-002H · Technical service bulletin · Electrical System · issued Feb 4, 2021
• The rack-mounted dual pinion Motor Driven Power Steering (MDPS) system components can be replaced separately from the complete assembly. This bulletin provides information on the s…
  21-ST-001H · Technical service bulletin · Steering · issued Jan 28, 2021
• When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message â Phone Not Responding. Please reconnect it and …
  21-01-007H · Technical service bulletin · Electrical System · issued Jan 26, 2021
• This bulletin provides information on the Launch Quality Monitoring Process (LQMP) for the 2021MY Hyundai Sonata N Line. After a new vehicle launch, Hyundai uses the LQMP to monito…
  21-GI-001H · Technical service bulletin · Electrical System · issued Jan 5, 2021
• When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message â Phone Not Responding. Please reconnect it and …
  20-BE-014H · Technical service bulletin · Electrical System · issued Dec 21, 2020
• This bulletin describes the procedure to replace the front door module assembly if the front door window cannot close or the door regulator cables are separated from the regulator …
  20-BD-020H · Technical service bulletin · Visibility · issued Dec 18, 2020
• This bulletin describes the procedure to identify and program certain Sonata vehicles Rear Corner Radars from the Advanced Driver Assistance Systems (ADAS) modules to enable the Sa…
  20-01-045H · Technical service bulletin · Equipment · issued Dec 2, 2020
• This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
  20-BR-002H · Technical service bulletin · Service Brakes · issued Nov 30, 2020
• This bulletin provides tire vibration service procedures, including how to optimize vehicle vibration performance. For all wheel/tire balance claims, the â Tire Balance Data Sheetâ…
  20-SS-004H · Technical service bulletin · Tires · issued Nov 19, 2020
• If you are servicing an applicable vehicle with a â Check Engineâ light on and one or more of the DTC listed below, follow the repair procedure and replace the related solenoid and…
  20-AT-005H-1 · Technical service bulletin · Power Train · issued Oct 13, 2020
• This bulletin provides a procedure to transfer pressure data to the TCU using GDS Mobile. This procedure is necessary to reduce the transmission learning time and improve the shift…
  20-AT-020H · Technical service bulletin · Power Train · issued Sep 2, 2020