{"nhtsa_id":11032925,"type":"over_the_air","type_name":"Over-the-air update","date_added":"2026-05-26","date":"2026-05-12","document_id":"N25-250552","mfr_campaign":"N25-250552","replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":"TCP: TCP (Telematics Connectivity Platform)","summary":"• Improvements to OnStar functionality.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11032925-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11032925-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11032925","components":[],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2021,"year_to":2022,"match":"base","vehicle_ids":["2021_chevrolet_silverado","2022_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 2500","year_from":2021,"year_to":2022,"match":"base","vehicle_ids":["2021_chevrolet_silverado","2022_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2021,"year_to":2022,"match":"base","vehicle_ids":["2021_gmc_sierra","2022_gmc_sierra"]},{"make":"GMC","model":"SIERRA 2500","year_from":2021,"year_to":2022,"match":"base","vehicle_ids":["2021_gmc_sierra","2022_gmc_sierra"]}],"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":[]}