{"nhtsa_id":11023346,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-09-25","date":"2025-09-15","document_id":"PIT6145A","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"This Preliminary information communicates information to verify if the vehicle frame has been lengthened or shorted as a result of the vehicle upfit. Dealer to refer to GM Upfitter bulletin 185 if frame has been modified.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11023346-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11023346-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11023346","components":[],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"5500HD","year_from":2022,"year_to":2022,"match":"exact","vehicle_ids":["2022_chevrolet_5500hd"]},{"make":"CHEVROLET","model":"6500HD","year_from":2020,"year_to":2020,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"SILVERADO 4500","year_from":2019,"year_to":2025,"match":"base","vehicle_ids":["2019_chevrolet_silverado","2020_chevrolet_silverado","2021_chevrolet_silverado","2022_chevrolet_silverado","2023_chevrolet_silverado","2024_chevrolet_silverado","2025_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 5500","year_from":2019,"year_to":2021,"match":"base","vehicle_ids":["2019_chevrolet_silverado","2020_chevrolet_silverado","2021_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 5500","year_from":2023,"year_to":2025,"match":"base","vehicle_ids":["2023_chevrolet_silverado","2024_chevrolet_silverado","2025_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 6500","year_from":2019,"year_to":2019,"match":"base","vehicle_ids":["2019_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 6500","year_from":2021,"year_to":2025,"match":"base","vehicle_ids":["2021_chevrolet_silverado","2022_chevrolet_silverado","2023_chevrolet_silverado","2024_chevrolet_silverado","2025_chevrolet_silverado"]}],"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":[]}