{"nhtsa_id":10200139,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-08-09","date":"2021-06-14","document_id":"21NA137","mfr_campaign":null,"replaces":null,"component":"EXTERIOR LIGHTING:HEADLIGHTS","mfr_system":null,"summary":"This service bulletin provides information for dealers/technicians on headlamp beam shadow appearance, and/or driver side to passenger side beam appears unlevel.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10200139-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10200139-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10200139","components":[{"id":"lighting","name":"Lighting","parent":null},{"id":"headlight","name":"Headlights","parent":"lighting"}],"codes":[],"topics":[],"vehicles":[{"make":"CADILLAC","model":"CT4","year_from":2020,"year_to":2021,"match":"exact","vehicle_ids":["2020_cadillac_ct4","2021_cadillac_ct4"]}],"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":[]}