# Service campaign 9B1 OL

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 campaign
- NHTSA id: 11011830
- Published by NHTSA: 2024\-12\-13
- Manufacturer's number: 9B1 OL
- Manufacturer's date: 2024\-12\-10
- Campaign id or software version: 9B1
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

The subject vehicles may have Diagnostic Trouble Code \(DTC\) P0451 stored in the ECU, which could cause the Check Engine Lamp to come on.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11011830-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11011830-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

P0451

## Vehicles listed

- 2020 to 2023 HYUNDAI SONATA

## Recalls for the same vehicles and component

- [20V213000](/recalls/nhtsa/20V213000.md), 2020-04-09: ELECTRICAL SYSTEM:SOFTWARE

## Other bulletins for the same vehicles and component

- [26\-GI\-002H TSB](/bulletins/11033710.md), 2026-06-06, Service bulletin: ELECTRICAL SYSTEM. This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2026 1st Navigation Map and Software Update Key Improvements and Additional Improvements tables in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater \(NAU\) and updated by USB.
- [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\-01\-045H TSB](/bulletins/11020693.md), 2025-07-15, Service campaign: ELECTRICAL SYSTEM. A software update is available for multiple vehicles equipped with either Display Audio 2.0V or the AVN 5th Gen Wide system.
- [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.

JSON: [/v1/bulletins/11011830](/v1/bulletins/11011830)

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