Mount Kinabalu is a 13,400 foot mountain in North Borneo formed by volcanism about ten million years ago. What caused this volcanism, why has volcanism ceased in Borneo, and what was the cause of the earthquake which shook the Kinabalu area in 2015?
According to Cottam et al. (2013), Mount Kinabalu was not formed by volcanism. It is a granite pluton, so it was emplaced in the crust as an intrusion, and later exhumed. The authors mention rollback of the subducting Celebes Sea as the cause for extension and magmatism in the region.
As for the earthquake, I can't answer this part, sorry.