2025-2026 Hyundai Tucson DCU Software Update TDFC

Hyundai Motor America (HMA) has re-launched Service Campaign TDFC to address a critical software issue affecting certain 2025-2026 Hyundai Tucson (NX4A) vehicles. This campaign, detailed in Technical Service Bulletin (TSB) 25-01-061H-1, focuses on a Data Communication Unit (DCU) software error that could impact vehicle telematics. This updated TSB supersedes the previous version, 25-01-061H, by providing additional information regarding VCI 2 connection and IP settings.

What's the Problem? The Hyundai Tucson DCU Software Error

Certain 2025-2026 Hyundai Tucson (NX4A) vehicles may experience a "DCU software error." This error stems from the internal timer initialization logic not being properly implemented within the Data Communication Unit. The primary consequence is that the DCU module may "shut down telematics services" after approximately one year of operation. This means features like Hyundai Bluelink services could become inoperable.

The Solution: DCU Software Update

To resolve the "Hyundai Tucson DCU software error," a software update for the DCU module is required. TSB 25-01-061H-1 provides the necessary instructions for technicians to perform this update. This update ensures the internal timer initialization logic is correctly implemented, preventing the telematics services from shutting down.

Over-the-Air (OTA) Update Availability

Hyundai offers an Over-the-Air (OTA) update option for this campaign. Owners with an active subscription to Hyundai Bluelink can complete this update themselves, eliminating the need for a dealership visit. This is a convenient way to address the "Hyundai Tucson DCU software error" without scheduling service.

Important Information for Owners

Hyundai is providing two primary methods for this update: a dealership visit or an Over-the-Air (OTA) update. "A visit to the dealership is not required" if the customer has an active Hyundai Bluelink subscription and can perform the OTA update. Dealers must confirm VIN eligibility using the 'Vehicle Information' screen in WebDCS under the 'Campaign Not Performed' section.

What Owners Should Do

If you own a 2025-2026 Hyundai Tucson, you should take the following steps to address the potential Hyundai Tucson DCU software error:

• Check Eligibility: Confirm if your vehicle is affected by Service Campaign TDFC. You can do this by checking your VIN with a Hyundai dealership or through Hyundai's online resources.
• Perform OTA Update: If you have an active Hyundai Bluelink subscription, you may be able to perform the software update yourself via an Over-the-Air (OTA) update. Follow the instructions provided by Hyundai for this process.
• Visit a Dealership: If you do not have an active Bluelink subscription or prefer professional assistance, schedule an appointment with your authorized Hyundai dealer. They will follow TSB 25-01-061H-1 to update the DCU module software. The update will be performed free of charge as part of the service campaign.

NHTSA ID: 11025960