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Warranty extension 26-01-082H DCS

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeWarranty extension
NHTSA id11038466
Published by NHTSA2026-10-14
Manufacturer's number26-01-082H DCS
Manufacturer's date2026-10-13
Campaign id or software versionLA42
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

Vehicles listed
HYUNDAI IONIQ 52025, 2026, 2027

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
26V0680002026-02-05. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
26V0470002026-01-26. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
25V4820002025-07-23. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
25V0640002025-02-06. AIR BAGS:SIDE/WINDOW; ELECTRICAL SYSTEM:WIRING

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
26-01-082H TSB2026-10-14. Warranty extension. 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.
Z14 OL2026-06-27. Warranty extension. 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 TSB2026-06-06. Service bulletin. 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 DCS2026-06-06. Warranty extension. 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 TSB2026-06-06. Warranty extension. 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.
26-01-043H TSB2026-05-12. Warranty extension. Certain IONIQ 5 (NEA EV) vehicles are eligible for a software update to the VCMS which would enable the Plug and Charge (PNC) function to support its use on Tesla V3 and V4 Superchargers, IONNA chargers, and ChargePoint chargers. This bulletin provides instructions for completing a software update to the VCMS.
26-BE-009H2026-04-21. Service bulletin. Some IONIQ 5 (NEA EV) vehicles may exhibit a no START/READY condition when pressing the START/STOP Button (SSB). This bulletin provides the procedure to inspect for the START/READY condition, and if needed, replace the Body Domain Control (BDC) module.
26-01-035H TSB2026-04-15. Service campaign. Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink functions. This may be due to an occasional disconnection on Verizon’s communication network. Follow the procedures in this bulletin to verify Bluelink Data Communication Unit (DCU) network connection and if needed, reset the DCU in Dealer Mode to resolve the connection.
25-01-024H-1 TSB2025-05-27. Service campaign. 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.
25-01-018H-1 TSB2025-05-27. Service campaign. Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink functions. This may be due to an occasional disconnection on Verizon’s communication network. Follow the procedures in this bulletin to verify Bluelink Data Communication Unit (DCU) network connection and if needed, reset the DCU in Dealer Mode to resolve the connection.