Hyundai Motor America has issued a Technical Service Bulletin (TSB 25-01-075H), for certain 2024–2026 Hyundai Sonata (DN8) models produced between October 18, 2023, and July 21, 2025.
This campaign addresses a potential issue where the air conditioning (AC) system may fail to fully shut off when the vehicle is parked and turned off, which can lead to battery drain.
If you own or lease a 2024, 2025, or 2026 Hyundai Sonata, your vehicle may be included in this service campaign. Please contact our service team to confirm whether your vehicle is affected.
The Air Temperature Control Unit (ATCU) may not completely power down after the vehicle is turned off, allowing the AC system to remain partially active. Over time, this can cause unnecessary battery drain while the vehicle is parked.
Hyundai has developed a software update for the ATCU that corrects the AC shut-off logic and ensures the system fully powers down when the vehicle is off.
This software improvement is part of Hyundai’s ongoing commitment to safety, reliability, and performance.
In some cases, this update can also be performed Over-the-Air (OTA) via Hyundai Bluelink, if your vehicle is equipped and connected.
If your vehicle is affected:
✅ This service is performed at no cost to you under Hyundai’s service campaign coverage.
Don’t wait—schedule your free ATCU software update with our certified Hyundai technicians today. We’ll confirm your vehicle’s eligibility and complete the update quickly and efficiently.
At World Hyundai Matteson, customer safety is our highest priority. While the remedy for the TSB 25-01-075H is in the works, our team is committed to:
Our Hyundai-certified technicians are fully trained and will use genuine Hyundai parts to ensure your Sonata meets factory standards once the remedy is performed.
Q: Is this a recall?
A: No, this is a Technical Service Bulletin (TSB) and Service Campaign. It’s not a safety recall, but Hyundai recommends that all affected owners have the update performed as soon as possible.
Q: How do I know if my vehicle needs this update?
A: You can check your VIN by contacting our service department. We can confirm if your Sonata is part of campaign 25-01-075H.
Q: Will this update cost me anything?
A: No. The software update is free of charge for eligible vehicles.
Q: Can this update be done remotely?
A: Yes, for some vehicles with an active Bluelink subscription, the update can be completed Over-the-Air (OTA).
Q: How long does the update take?
A: The in-dealership procedure typically takes less than 30 minutes.
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Disclaimer
The information provided on this page is based on official communications from Hyundai Motor America regarding Technical Service Bulletin (TSB 25-01-075H). For the most current information, please contact Hyundai Motor America or the World Hyundai Matteson Service Department.
