Engine light is on 2005 Duramax

GlennI

Went to check the code to see why check engine light is on and there is no power to jack. Any idea why?

Mr_Shiftright

Were you using a simple code reader or a professional scan tool?

Before you do anything else, check all your fuses. Some OBD ports are fused, often to the same circuit as a 12V power supply socket, or cigarette lighter socket if your truck has one.