KTBZ-FM began transmitting in the HD Radio hybrid format in January 2006. KTBZ-FM-HD2 has gone through three different format changes: From 2006 to 2009 it was alternative rock "Liquid Buzz" (with a different playlist from the main station). Then from 2009 to 2015 it was "94-5 The Rock, Houston's Rock Station", playing active rock and classic rock. In 2015, KTBZ-FM-HD2 flipped to Regional Mexican music as "La Mejor", and began simulcasting on FM translator K283CH (104.5 FM). On September 7, 2017, at 9 a.m., KTBZ-FM HD2 dropped the 104.5 translator, and began retransmitting on two co-owned translators on the 102.5 frequency, K273AL (licensed to Porter) and K273CW (licensed to Houston). 104.5 switched to an urban AC format, branded as "104.5 KISS-FM", and relayed by iHeartMedia sister station KQBT HD-2.