Hyundai Elantra 2019–2020 — service campaign
Bulletin 9D3 OL · NHTSA communication 11037292 · issued Sep 11, 2026
Service campaign
communication type
Electrical System
component
2019–2020
model years
2
vehicle entries
Official summary
Hyundai has become aware that your Hyundai Elantra equipped with a 2.0 ATK engine may have been incorrectly updated with Cylinder Noise Detection System (CNDS) software intended only for Korean-built Elantra vehicles and may not meet specifications.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.