2015 Ram pick up truck 1500 diesel P0336. Try this 1st before removing the tranny.

Vehicle is towed cranks but no start. When i diagnose trucks like this i always try my best to get it running and drive it in the shop. So usually the 1st i do is if it cranks i will spray starting fluid and check for spark. And if none work, then i give up and push it in the shop. I hate pushing vehicle :) if i can get it to run outside then it will save me time and i can do more later.