On July 28, 1975, the Canadian Broadcasting Corporation received approval from the CRTC to operate a new english-language FM station at Sudbury, Ontario.

[3] However, the station launched in 1978 as an affiliate of the talk network after the CBC was unable to negotiate an agreement with Cambrian Broadcasting to directly acquire CKSO.

In the CBC's service reductions announced in March 2009, CBCS was slated to lose half of its existing staff.

Several hundred people attended a rally at the city's Tom Davies Square on April 5 to protest the cutbacks, with participants including federal MPs Glenn Thibeault, Claude Gravelle and Charlie Angus, and musicians Kevin Closs and Stéphane Paquette.

[8] The former studio on Mackenzie Street was then rented out to Siena Films as the police station in the 2017 drama series Cardinal.

[12] The new program extends its coverage to all of Northern Ontario, also replacing Voyage North on CBQT-FM in Thunder Bay.

[19] On July 4, 2014, the CBC submitted an application to convert CBEU 1340 to the FM band, which received CRTC approval on November 4, 2014.

[23] On August 19, 2021, the CRTC approved the CBC's application to increase the average effective radiated power (ERP) for CBEC-FM at 90.3 MHz Elliot Lake from 103 to 1,065 watts (maximum ERP from 264 to 2,725 watts), increasing the effective height of the antenna above average terrain from 141.0 to 165.3 metres.