I pulled the motor in my 2003 2500 truck to swap cam and valve springs. Everything back together and re-installed......but I cannot get any spark. I double checked connections on crank positioning sensor and replaced the cam positioning sensor. Tried to check DTCs while cranking and not seeing any codes. What else should I check????

 

Have you checked the fuses /relays for the ignition? Did you make sure the ground to the engine is properly connected? Did you actually pull a plug and ground it to visually verify no spark? Did you change plugs at the same time?