Formerly established in 1976 as a rebroadcaster of Matane's CBGA, CBSI was launched as a separate station in 1982. The station now has several rebroadcasters of its own throughout Quebec's Côte-Nord and in parts of Labrador.
The station's current local programs are Bonjour la côte, in the mornings from 6 a.m. to 9 a.m., and Boréale 138 in the afternoons, 4 p.m. to 6 p.m. CBSI-FM also co-produces D'Est en est, a pan-regional program produced in turn with CBGA-FM and CJBR-FMRimouski, and heard afternoons during the summer months. On public holidays, its local programs are replaced with Chez nous le matin from CBF-FM-8 in Trois-Rivières and L'heure de pointe from CBJ-FM in Saguenay. Its Saturday morning program, Samedi et rien d'autre, originates from CBF-FMMontreal.
In 1986, the CBC received CRTC approval to switch frequencies on a number of CBSI low-power AM rebroadcasters in Quebec.
CBSI-FM-2 Schefferville previously broadcast as CFKL, a local station owned by Hollinger-Ungava Transport Ltd. that operated at 1230 kHz. It is not known when the station began broadcasting, nor when it became a rebroadcaster of Radio-Canada, which acquired the station in 1965. By 1986, it was known as CBSI-2 (it would become CBSI-FM-2 upon conversion to FM in 1994).