KMPH signed on in July 2006 with an Adult Standards/MOR format, with some talk programming. It effectively replaced sister station KTRB, which had operated from Modesto since 1933, but had just signed off the previous month in preparation of a move to the San Francisco Bay Area. The station switched to an all-talk format on March 10, 2008.
Pappas shut KMPH down on August 31, 2010 due to lack of revenue.
KMPH later returned to air with brokered programming provided by Paulino Bernal Evangelism of Texas, then temporarily switched to a Talk format in May 2013 fed via KOMY (1340 AM) in La Selva Beach, California. On July 1, 2013, KMPH switched to a 1950s/1960s "Graffiti Gold" Oldies format, re-launching as "Modesto's Power House" and drawing on Modesto's connection to hometown hero George Lucas's classic 1973 motion picture, American Graffiti.