{"nhtsa_id":10147328,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-13","date":"2018-09-13","document_id":"18247","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL","mfr_system":null,"summary":"18247 - Service Update - Certain vehicles with C3 clusters and RPO IOS radios show speed limit signs with ??? as the posted speed on the cluster. It does not state the actual speed limit on the road and should be recalibrated to remove from display. Vehicle needs to be re-calibrated to remove ?Speed Sign? because IOS radios do not support this feature.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10147328-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10147328-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10147328","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"instrument-cluster","name":"Instrument cluster","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"BUICK","model":"REGAL","year_from":2018,"year_to":2018,"match":"exact","vehicle_ids":["2018_buick_regal"]}],"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":[]}