Certain Sonata (DN8) vehicles may exhibit intermittent battery discharge condition due to the air...
Hyundai technical service bulletin 7/13/2026 TSB for 2024-2026 Hyundai Sonata.
- Bulletin number
- 7/13/2026 TSB (LA29)
- Component
- Electrical system
- Summary
- 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.
Owners of these vehicles have filed 21 complaints in the electrical category.
Vehicles covered
- Hyundai Sonata 2024-2026 202420252026
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