# Service campaign 25\-01\-005H TSB

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: 11013237
- Published by NHTSA: 2025\-01\-30
- Manufacturer's number: 25\-01\-005H TSB
- Manufacturer's date: 2025\-01\-25
- Campaign id or software version: TCS
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Certain vehicles listed below may have a Bluelink malfunction or not able to have Bluelink setup. This bulletin provides instructions to reset the network in Dealer Mode to prevent the Data Concentrator Unit \(DCU\) modem from experiencing a "Blue Link Not Open" error.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11013237-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11013237-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2025 HYUNDAI IONIQ 5
- 2025 HYUNDAI KONA
- 2025 HYUNDAI SONATA

## Recalls for the same vehicles and component

- [26V068000](/recalls/nhtsa/26V068000.md), 2026-02-05: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [25V482000](/recalls/nhtsa/25V482000.md), 2025-07-23: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [25V064000](/recalls/nhtsa/25V064000.md), 2025-02-06: AIR BAGS:SIDE/WINDOW; ELECTRICAL SYSTEM:WIRING

## Other bulletins for the same vehicles and component

- [26\-01\-082H TSB](/bulletins/11038467.md), 2026-10-14, Warranty extension: ELECTRICAL SYSTEM. Certain IONIQ 5 \(NEA EV\) vehicles may experience Malfunction Indicator Lamp \(MIL\) illumination and false battery overtemperature fault diagnosis caused by water ingress into the high voltage battery system. This condition may cause unnecessary fail\-safe activation, potentially resulting in reduced vehicle performance or limited vehicle operation if the vehicle is continually driven. This bulletin provides the service procedure to update the Battery Management System \(BMS\) software to optimize the fail\-safe activation logic to prevent false activation. Additionally, diagnostic criteria for DTC P1AD300 “Hybrid/EV Battery Abnormal Performance: MISD” has also been improved to enhance diagnostic accuracy.
- [26\-01\-082H DCS](/bulletins/11038466.md), 2026-10-14, Warranty extension: ELECTRICAL SYSTEM. Certain IONIQ 5 \(NEA EV\) vehicles may experience Malfunction Indicator Lamp \(MIL\) illumination and false battery overtemperature fault diagnosis caused by water ingress into the high\-voltage battery system. This condition may cause unnecessary fail\-safe activation, potentially resulting in reduced vehicle performance or limited vehicle operation if the vehicle is continually driven.
- [LA29\-LA30 DCS](/bulletins/11035142.md), 2026-07-21, Warranty extension: ELECTRICAL SYSTEM. Certain 2024\-2026MY Sonata \(DN8\) and 2024\-2026MY Sonata Hybrid \(DN8 HEV\) vehicles may exhibit intermittent battery discharge condition due to the air conditioning controller not fully powering down after the vehicle is turned off and parked. Technical Service Bulletins \(TSB\) 26\-01\-051H \& 26\-01\-052H provide the procedure to update the ATCU \(Air Temperature Control Unit\) software; the revised logic improves controller shutdown to prevent battery drain and corrects a condition where the HVAC control display may appear blank when climate remote start is activated via Bluelink. Over\-the\-Air \(OTA\): This update can also be conducted via OTA. Customers can complete on their own if they have an active subscription to Hyundai Bluelink. A visit to the dealership is not required. Deployment of the OTA to Bluelink customers is planned to start the week of 07/13/26.
- [26\-01\-052H TSB](/bulletins/11035141.md), 2026-07-21, Warranty extension: ELECTRICAL SYSTEM. Certain Sonata Hybrid \(DN8 HEV\) vehicles may exhibit intermittent battery discharge conditions due to the air conditioning controller not fully powering down after the vehicle is turned off and parked. This bulletin provides the procedure to update the Air Temperature Control Unit \(ATCU\) software; the revised logic improves controller shutdown to prevent battery drain and corrects a condition where the HVAC control display may appear blank when climate remote start is activated via Bluelink.
- [7/13/2026 TSB](/bulletins/11035140.md), 2026-07-21, Warranty extension: ELECTRICAL SYSTEM. Certain Sonata \(DN8\) vehicles may exhibit intermittent battery discharge condition due to the air conditioning controller not fully powering down after the vehicle is turned off and parked. This bulletin provides the procedure to update the ATCU \(Air Temperature Control Unit\) software; the revised logic improves controller shutdown to prevent battery drain and corrects a condition where the HVAC control display may appear blank when climate remote start is activated via Bluelink.
- [26\-FL\-003H TSB](/bulletins/11034847.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM; ENGINE. Some Kona \(SX2\) vehicles equipped with the 1.6L T‑GDI engine may exhibit false “engine left idling” notifications in the MyHyundai app, even when the engine is not running, due to a logic error associated with the front oxygen \(O₂\) sensor. This condition may also illuminate the Malfunction Indicator Lamp \(MIL\) and set DTC P223700 \(O₂ Sensor Pumping Current Circuit/Open \[Bank 1 Sensor 1\]\). This bulletin provides instructions to perform an ECU software update to correct the O₂ sensor logic and resolve the condition.
- [Z14 OL](/bulletins/11034111.md), 2026-06-27, Warranty extension: FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM. Certain 2022 – 2024 model year IONIQ 5, 2024 model year IONIQ 5 Robotaxi, and 2023 – 2025 model year IONIQ 6 vehicles may require a replacement of the Integrated Charging Control Unit \(ICCU\) and ICCU Fuse. At Hyundai, we are committed to providing vehicles of outstanding quality and value. In an effort to meet this commitment, the warranty coverage for the Integrated Charging Control Unit \(ICCU\) and ICCU Fuse Replacement has been extended to 15 years/ 180,000 miles from the date of original retail delivery or date of first use \(whichever occurs first\) and is valid for original and subsequent owners.
- [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\-01\-046H DCS](/bulletins/11033697.md), 2026-06-06, Warranty extension: ELECTRICAL SYSTEM. Certain IONIQ 5 \(NEA EV\) vehicles may have 12V battery drainage due to the scheduled climate feature. Technical Service Bulletin \(TSB\) 26\-01\-046H provides instructions to perform a software update for the Vehicle Control Unit \(VCU\) to improve the logic of the scheduled climate reducing battery drainage.
- [26\-01\-046H TSB](/bulletins/11033696.md), 2026-06-06, Warranty extension: ELECTRICAL SYSTEM. Certain IONIQ 5 \(NEA EV\) vehicles may have 12V battery drainage due to the scheduled climate feature. This bulletin provides instructions to perform a software update for the Vehicle Control Unit \(VCU\) to improve the logic of the scheduled climate reducing battery drainage.

JSON: [/v1/bulletins/11013237](/v1/bulletins/11013237)

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