2021 Hyundai Tucson Emissions ECU Software Update

Hyundai Motor America (HMA) has re-launched Service Campaign 9C2 to address elevated engine-out emissions in certain vehicles equipped with Theta II engines. This campaign involves an Engine Control Module (ECM) software update. The specific instructions for this critical update are provided in Technical Service Bulletin (TSB) 25-01-087H-1, which supersedes the previous TSB 25-01-087H.

This re-launched campaign, identified as Service Campaign 9C2, aims to improve the emissions performance of affected vehicles. The update adds coverage for 2018MY Sonata (LFA) and Tucson (TL) vehicles, incorporating new software events 1330 and 1331. This ensures that the Hyundai Tucson emissions update is applied to a broader range of vehicles.

What is Service Campaign 9C2?

Service Campaign 9C2 is a manufacturer-initiated program designed to correct a potential emissions issue. It focuses on vehicles equipped with the Theta II engine that may exhibit elevated engine-out emissions. The campaign involves updating the Engine Control Module (ECM) software to optimize engine performance and reduce emissions.

This campaign is a re-launch, indicating an expansion of its scope to include additional model years and vehicles. The updated Technical Service Bulletin (TSB) 25-01-087H-1 provides comprehensive instructions for dealers to perform the necessary software update.

Understanding the Issue: Elevated Emissions

Vehicles equipped with Theta II engines, including the 2021 Hyundai Tucson, may produce higher-than-intended engine-out emissions. This condition can impact environmental compliance and overall engine efficiency. The Hyundai Tucson emissions update is designed to mitigate this by recalibrating the engine's control systems.

Elevated emissions are typically a result of sub-optimal engine calibration or component performance. Addressing this proactively helps ensure the vehicle meets regulatory standards and operates as intended.

The Solution: ECU Software Update

The primary solution for this issue is an Engine Control Module (ECM) software update. This update, detailed in TSB 25-01-087H-1, introduces new software events, specifically 1330 and 1331, which contain revised programming for the ECM. The ECM is responsible for managing various engine functions, including fuel injection, ignition timing, and emissions control.

By updating the ECM software, Hyundai aims to recalibrate these parameters to reduce engine-out emissions. This software revision is a precise and targeted fix, ensuring that the engine operates within its designed emissions specifications.

Repair Procedure Summary

Dealers are instructed to follow a specific procedure to implement the Hyundai Tucson emissions update:

1. Confirm VIN Eligibility: Technicians must first confirm the vehicle's eligibility for Service Campaign 9C2 using the WebDCS system.
2. Software Update: The next step involves following the detailed service procedure outlined in TSB 25-01-087H-1 to update the ECM software. This process typically requires specialized diagnostic equipment like GDS (Global Diagnostic System).
3. Campaign Claim Submission: After successfully completing the software update, the dealer must submit a campaign claim to Hyundai.

This procedure ensures that all necessary steps are taken to correctly apply the emissions improvement. The TSB also provides information regarding associated GDS, Warranty, ROM ID, and Manual Mode Password details for technicians.

Important Information and What to Expect

For all vehicles receiving this update, an Emissions Label will be required. Additionally, a Vehicle Emission - Proof of Correction Card may be necessary for applicable states. Owners should expect their Hyundai dealer to handle all aspects of this service campaign, including confirming eligibility and performing the software update.

What Owners Should Do

If you own a 2021 Hyundai Tucson, it is recommended to contact your authorized Hyundai dealer to determine if your vehicle is affected by Service Campaign 9C2. The dealer will be able to check your VIN for eligibility and schedule the necessary Engine Control Module (ECM) software update as per TSB 25-01-087H-1. This update will be performed free of charge under the service campaign.

NHTSA ID: 11027008