{"nhtsa_id":11022351,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-09-02","date":"2025-08-20","document_id":"SC345_TSB","mfr_campaign":"SC345","replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN FRONT MOTOR REDUCTION GEAR OIL REPLACEMENT (SC345) - This bulletin provides information to replace the front motor reduction gear assembly gear oil on certain 2023-2024MY Niro EV (SG2 EV) vehicles produced from December 12, 2022 through February 7, 2024 and EV6 (CV) vehicles produced from December 14, 2022 through February 22, 2024. During the production of the subject vehicles, the amount of gear oil in the front motor and reduction gear assembly may have been filled below factory specification. If the gear oil level is lower than Kia’s factory specifications, the subject vehicles may eventually produce a grinding noise or whining noise from the front of the vehicle while driving.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022351-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11022351-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11022351","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"KIA","model":"EV6","year_from":2023,"year_to":2024,"match":"exact","vehicle_ids":["2023_kia_ev6","2024_kia_ev6"]},{"make":"KIA","model":"NIRO EV","year_from":2023,"year_to":2024,"match":"base","vehicle_ids":["2023_kia_niro","2024_kia_niro"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}