{"nhtsa_id":10226235,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-11-17","date":"2022-11-17","document_id":"N222380840","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"General Motors has decided to conduct a Voluntary Emissions Recall on certain vehicles with a 6.6L engine (RPO L8T). The Transmission Control Module (TCM) in these vehicles may have been service reprogrammed with incorrect calibrations. If this occurred, the transmission shift quality and timing could be degraded. Dealers are to reprogram the TCM.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10226235-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10226235-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10226235","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"3500","year_from":2022,"year_to":2022,"match":"exact","vehicle_ids":["2022_chevrolet_3500"]},{"make":"CHEVROLET","model":"4500HD","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_chevrolet_4500hd"]},{"make":"CHEVROLET","model":"4500XD","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_chevrolet_4500xd"]},{"make":"CHEVROLET","model":"SILVERADO 3500","year_from":2022,"year_to":2022,"match":"base","vehicle_ids":["2022_chevrolet_silverado"]},{"make":"CHEVROLET","model":"SILVERADO 4500","year_from":2021,"year_to":2021,"match":"base","vehicle_ids":["2021_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":[]}