Lexusbling

My 2nd time experiencing the vsc, trac control, and check engine light come on at same time. I've attempted the gas cap already. Last time this happened about 2 months ago, it lasted about 3-4 days, and when I was on my way to have the codes read, it turned off when I started my car. My '09 RX 350 has 145k mi and has always been greatly maintained.