2021 Hyundai Sonata Hybrid service bulletins & manufacturer communications

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

• 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 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)…
  25-EM-007H TSB · Technical service bulletin · Engine · issued Dec 18, 2025
• 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 Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.
  25-01-010H-1 9B4 OL · Service campaign · Electrical System · issued Aug 21, 2025
• 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…
  25-01-010H-1 DN · Service campaign · Electrical System · issued Jul 16, 2025
• 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 …
  25-01-010H-1 TSB · Service campaign · Electrical System · issued Jul 16, 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
• 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
• 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…
  25-01-010H DN · Technical service bulletin · Fuel/propulsion System · issued Feb 11, 2025
• 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 …
  25-01-010H TSB · Service campaign · Fuel/propulsion System · issued Feb 11, 2025
• This bulletin provides the procedure for updating the automatic transmission TCU (Transmission Control Unit) software to improve shift quality, judder and hesitation when accelerat…
  24-AT-001H-1 · Technical service bulletin · Power Train · issued Dec 18, 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
• 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…
  24-01-054H · Service campaign · Electrical System · issued Jul 9, 2024
• 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 …
  SERVICE CAMPAIGN 9B4 · Technical service bulletin · Electrical System · issued Jul 4, 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 bulletin provides the procedure to update the Hybrid Control Unit (HCU) and Dual Automatic Temperature Control (DATC) software to help improve coolant flow to the Exhaust Heat…
  23-01-093H · Technical service bulletin · Engine and Engine Cooling · issued Jan 10, 2024
• Certain 2020-2023MY Sonata Hybrid (DN8 HEV) vehicles may exhibit coolant leakage, engine overheating, and white smoke from the exhaust due to an internal leak at the Exhaust Heat R…
  23-EM-009H · Technical service bulletin · Engine and Engine Cooling · issued Dec 15, 2023
• This bulletin provides the procedure to update the Hybrid Control Unit (HCU) and Dual Automatic Temperature Control (DATC) software to help improve coolant flow to the Exhaust Heat…
  23-01-093H · Technical service bulletin · Electrical System · issued Dec 15, 2023
• 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 provides information related to the Engine Control Module (ECM) software update and coolant replacement for 2020-2023MY Sonata Hybrid (DN8 HEV) vehicles to improve th…
  23-HC-002H · Technical service bulletin · Power Train · issued Aug 25, 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
• 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
• 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 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
• 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 Service Procedure and replace the valve body internal…
  22-AT-010H · Technical service bulletin · Engine and Engine Cooling · issued Aug 17, 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 below, follow the Service Procedure and replace the related solenoid an…
  22-AT-008H · Technical service bulletin · Engine and Engine Cooling · issued Jun 21, 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
• 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…
  22-ST-005H · Technical service bulletin · Steering · issued Apr 8, 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…
  22-ST-005H · Technical service bulletin · Steering · issued Apr 8, 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 Service Procedure and replace the harness with an int…
  Certain vehicles · Technical service bulletin · Engine · issued Mar 14, 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 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
• This TSB provides a procedure to diagnose the push button shifter operation.
  21-AT-009H · Technical service bulletin · Power Train · issued Jul 13, 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 describes the procedure to update the Shift Control Unit (SCU) for Shift-by-Wire vehicles (SBW). The update improves the display in the cluster.
  21-01-040H · Technical service bulletin · Power Train · issued May 24, 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 · Equipment · issued Mar 30, 2021
• This bulletin provides best practice recommendations when performing brake service procedures.
  21-BR-002H · Technical service bulletin · Equipment Adaptive/mobility · 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 · Equipment · issued Feb 4, 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