Got a 04.5 cummins and was driving it home when all of a sudden it started a hard hard knock (extremely loud). Immediately shut it off and towed it home. Anyways it's smoking white bad and knocking. Got codes p0201 p0202 p0203 p0204 p0205 p0206. I took valve cover off and unhooked each injector and started truck each time and knock never went away. Unplugged the fca and it didn't change anything. I dont know why to do next??? HELP!!

 

Did you check oil level in it? Check your intake plumbing for oil from a blown turbo seal? If it's a hard knock it's quite possibly a rod bearing failure or main bearing too.

 

oil is good. But why would I be getting a code from all 6 injectors if it's a bearing?

 

i forgot to mention the codes I posted are "injector circuit open" got the same code on each injector

 

I suspect the codes are from when you unhooked each injector. Can you check oil pressure with a mechanical gauge?

 

ive cleared all the codes and they came back and yes oil pressure is good

 

Remove the oil filter and open it up. Check for metal particles. If no metal, there is a good chance that the knock is not bearing related. Any metal that shows up in the filter is unfortunately $$$$.

Check the water level? Don't think this is the problem, but maybe a blown head gasket?

Keep us posted on what you find.

 

So you checked it with a mechanical gauge or your making an assumption based on the instrument panel? What was the mechanical gauge reading?

 

Have you found the cause of the knock in your engine?