# Service bulletin 21\-GI\-001H

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10186815
- Published by NHTSA: 2021\-02\-06
- Manufacturer's number: 21\-GI\-001H
- Manufacturer's date: 2021\-01\-05
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

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 monitor all customer and dealer activities at a minimum of 100 days. The Sonata N Line LQMP helps improve model vehicle quality, and allows Hyundai to proactively respond to the Voice of the Customer \(VOC\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186815-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186815-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Vehicles listed

- 2021 HYUNDAI SONATA

## Other bulletins for the same vehicles and component

- [26\-EE\-003H TSB](/bulletins/11031400.md), 2026-04-21, Service bulletin: ENGINE; ELECTRICAL SYSTEM. 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 and, if necessary, replace the starter magnetic switch \(solenoid\) assembly.
- [25\-BE\-020H TSB](/bulletins/11023692.md), 2025-10-03, Service bulletin: ELECTRICAL SYSTEM. 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.
- [25\-01\-010H\-1 9B4 OL](/bulletins/11022097.md), 2025-08-22, Service campaign: ELECTRICAL SYSTEM. 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 DN](/bulletins/11020799.md), 2025-07-22, Service campaign: ELECTRICAL SYSTEM. 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.
- [25\-01\-010H\-1 TSB](/bulletins/11020798.md), 2025-07-22, Service campaign: ELECTRICAL SYSTEM. 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.
- [25\-BE\-002H TSB](/bulletins/11018876.md), 2025-06-03, Service bulletin: ELECTRICAL SYSTEM. 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.
- [25\-01\-024H\-1 TSB](/bulletins/11018575.md), 2025-05-27, Service campaign: ELECTRICAL SYSTEM. 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.
- [25\-EE\-002H](/bulletins/11017474.md), 2025-05-02, Service bulletin: ENGINE; ELECTRICAL SYSTEM. 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, reroute the damaged wiring using the blower wiring kit, and replace the fuse label.
- [25\-EE\-002H TSB](/bulletins/11017341.md), 2025-04-30, Service bulletin: ELECTRICAL SYSTEM. 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, reroute the damaged wiring using the blower wiring kit, and replace the fuse label.
- [25\-01\-024H EM](/bulletins/11017111.md), 2025-04-18, Service campaign: ELECTRICAL SYSTEM. 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.

JSON: [/v1/bulletins/10186815](/v1/bulletins/10186815)

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