I have an 06 Cummins and holy cow I just can not figure it out. So when I first bought the truck in August it had a long crank to start, about 2 weeks ago it stopped starting on its own or took extraordinarily long but would give with a jump. We replaced the batteries, fuel and air filter, and tested all the fuses and grounds because it was giving me P2905. Well we ended up replacing the entire fan clutch, and tested the grid heater(worked good) and it stopped acting up completely. I let it sit for about 4 days while I was out of town and came back, I tried to start it and nothing I though well it's really cold so we tried to jump it, nothing. Waiting till it was hot again next day tried to jump, nothing and then noticed someone unplugged my fan clutch. Okay, plugged it back it. And STILL no start even with jump, receiving codes: P2905, P0480, P0483, and today P0111. Please help, any ideas??

 

Nothing? No crank? Or no start?

 

So we just reset the system, and all codes but p2509 went away. (Go figure, it's the root of the problem) but it does crank, it just has no start, its constantly draining the batteries and today we've cleaned and fixed any and all grounds. Got a multi-meter now, and looking at the ECU maybe? Just can't seem to figure this out. Definitely no start.

 

Okay so after some searching I found this. Check rail fuel pressures. This will tell you if the lift and injector pumps are working. I believe that code deals with the fuel pressure regulator. The fix for that is replace the lift pump. I would check it first. Many fixes seem to be injectors. Usually clogged with trash. Due to contaminated fuel. If that's the case you will need to clean out the tank too. hope this helps