{"nhtsa_id":10246277,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-12-06","date":"2023-12-05","document_id":"N232412712","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Service Update - Certain vehicles with a 2.0L engine have an Engine Control Module (ECM) that may not properly diagnose, may not set Diagnostic Trouble Codes (DTCs), or may not illuminate the Malfunction Indicator Light (Check Engine Light) if certain fault conditions of the catalytic converter were to occur. Owners who have accepted applicable terms and conditions will have the opportunity to accept these software changes using wireless over-the-air (OTA) technology without having to bring their vehicle to a dealership. Alternatively, owners may have their vehicle serviced at a GM dealer to receive these software updates. Dealers are to reprogram the ECM.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10246277-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10246277-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10246277","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null},{"id":"engine-control-module","name":"Engine control module","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"CADILLAC","model":"CT4","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_cadillac_ct4"]},{"make":"CADILLAC","model":"CT5","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_cadillac_ct5"]}],"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":[]}