What is Service Campaign 9C2 for Hyundai vehicles?

Service Campaign 9C2 is a program launched by Hyundai Motor America to update the Engine Control Module (ECM) software in certain vehicles equipped with Theta II engines. This update aims to address and correct instances of "elevated engine-out emissions."

Which Hyundai models are affected by TSB 25-01-087H?

Technical Service Bulletin (TSB) 25-01-087H applies to certain Hyundai vehicles equipped with Theta II engines, including the 2021 Hyundai Tucson. Owners of other models like certain 2019-2020 Santa Fe and 2019 Sonata vehicles may also be affected, as detailed in the full bulletin.

What is the fix for the elevated engine-out emissions issue?

The fix involves an ECU software update for the Engine Control Module (ECM). This update, performed by an authorized Hyundai dealer following TSB 25-01-087H, reprograms the ECM to optimize engine performance and reduce emissions.

How can I check if my Hyundai Tucson needs this ECU software update?

You can check your vehicle's eligibility for Service Campaign 9C2 by visiting an authorized Hyundai dealer. They can confirm if your VIN is included in the campaign using the 'Vehicle Information' screen in WebDCS under the 'Campaign Not Performed' section.

Service Bulletin

2021 Hyundai Tucson ECU Software Update for Emissions

Hyundai Motor America has launched Service Campaign 9C2 to update the Engine Control Module (ECM) software on certain 2021 Hyundai Tucson vehicles equipped with Theta II engines. This update addresses elevated engine-out emissions and is detailed in Technical Service Bulletin (TSB) 25-01-087H.

Marcus Weber2021 Hyundai TucsonApril 25, 2026

2021 Hyundai Tucson — Hyundai Tucson ECU software update — Editorial illustration generated for this article.

Hyundai Tucson ECU software updateService Campaign 9C2TSB 25-01-087Helevated engine-out emissionsHyundai Theta II engineEngine Control Module updateECM software update2021 Hyundai TucsonHyundai Santa Fe emissionsHyundai Sonata emissions

Why This Matters

Hyundai Motor America has initiated Service Campaign 9C2 to address a potential issue with elevated engine-out emissions in certain vehicles equipped with Theta II engines. This campaign specifically targets the Engine Control Module (ECM) software, aiming to optimize its performance and ensure compliance with emissions standards. An effective Hyundai Tucson ECU software update is crucial for maintaining environmental responsibility and proper vehicle operation.

What's Being Addressed

The core of Service Campaign 9C2 is an ECU software update designed to correct instances of "elevated engine-out emissions" that may occur in affected vehicles. These emissions issues are linked to the Theta II engines found in various Hyundai models. The update involves reprogramming the Engine Control Module (ECM) to bring the engine's emissions performance within specified parameters. This proactive measure ensures that your vehicle operates cleanly and efficiently.

Repair Procedure Summary

The repair for the elevated engine-out emissions involves an ECU software update. Hyundai dealerships will perform this procedure by following the detailed instructions provided in Technical Service Bulletin (TSB) 25-01-087H. The process includes confirming VIN eligibility using the WebDCS system and then proceeding with the software update. Once the update is successfully completed, the dealership will submit a claim for the service. This Hyundai Tucson ECU software update is a standard procedure performed by certified technicians.

Required Parts

To complete the service campaign, specific parts may be required:

Emissions Label: One (1) label for all vehicles.
Vehicle Emission - Proof of Correction Card: One (1) card for applicable states only, as listed in the TSB.

These items ensure proper documentation and compliance following the software update.

What Owners Should Know

Hyundai Motor America has launched this as a Service Campaign with Customer Notification 9C2, meaning owners of affected vehicles will be notified. It is essential for owners to confirm their vehicle's eligibility for this campaign. You can do this by checking the 'Vehicle Information' screen in WebDCS under the 'Campaign Not Performed' section. This Hyundai Tucson ECU software update is a critical maintenance item to ensure your vehicle meets emissions standards.

If you receive a notification or suspect your vehicle may be affected, contact your authorized Hyundai dealer to schedule the necessary service. The dealer will perform the Engine Control Module (ECM) software update as outlined in TSB 25-01-087H.

Source: NHTSA ID: 11025965

Frequently Asked Questions

What is Service Campaign 9C2 for Hyundai vehicles?: Service Campaign 9C2 is a program launched by Hyundai Motor America to update the Engine Control Module (ECM) software in certain vehicles equipped with Theta II engines. This update aims to address and correct instances of "elevated engine-out emissions."
Which Hyundai models are affected by TSB 25-01-087H?: Technical Service Bulletin (TSB) 25-01-087H applies to certain Hyundai vehicles equipped with Theta II engines, including the 2021 Hyundai Tucson. Owners of other models like certain 2019-2020 Santa Fe and 2019 Sonata vehicles may also be affected, as detailed in the full bulletin.
What is the fix for the elevated engine-out emissions issue?: The fix involves an ECU software update for the Engine Control Module (ECM). This update, performed by an authorized Hyundai dealer following TSB 25-01-087H, reprograms the ECM to optimize engine performance and reduce emissions.
How can I check if my Hyundai Tucson needs this ECU software update?: You can check your vehicle's eligibility for Service Campaign 9C2 by visiting an authorized Hyundai dealer. They can confirm if your VIN is included in the campaign using the 'Vehicle Information' screen in WebDCS under the 'Campaign Not Performed' section.

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2021 Hyundai Tucson Emissions Logic Update (9C2)

Hyundai Service Campaign 9C2 addresses elevated engine-out emissions in certain 2021 Hyundai Tucson models by updating the Engine Control Module (ECM) software. This update helps ensure compliance with emissions standards and prevents failed inspections.

2015 Hyundai Sonata GDS Event 1383 Campaign Suspended

Hyundai Motor America has temporarily suspended Service Campaign 9C2, related to software GDS event #1383, for the 2015 Hyundai Sonata (LFA) 2.4L. Vehicles will not show this campaign as open in WebDCS during the suspension period.

2021 Hyundai Tucson GDS Event #1383 Engine Investigation

Hyundai is actively investigating a software-related engine issue, identified as GDS event #1383. While primarily concerning 2015 Sonata 2.4L vehicles, this manufacturer communication is linked by NHTSA to the 2021 Hyundai Tucson, indicating an ongoing review for a resolution.

2010-2021 Hyundai Engine Bearing TSB 26-01-033H

Hyundai Technical Service Bulletin (TSB) 26-01-033H is a critical reference for Op codes and part numbers under Service Campaign T6G. This campaign addresses engine bearing inspection and replacement for various Hyundai models from 2010-2021, often triggered by DTC P1326 and "Abnormal Engine Noise."

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