04 Chevy 2500 hd duramax running rough

[ffsteve]

Truck is running super rough, it will stay running but runs like shit.
Got five codes
Po202, po203, po205, po208. Injector circuit open cylinder 2,3,5,8
P2149 fuel injector grb B supply voltage circuit open.

What could be wrong??

 

[02greysixer]

Assuming it's an lly it's likely a bad connection at #2 injector plug. Search ice pick fix

Sent from my SAMSUNG-SM-G870A using Tapatalk

 

[ffsteve]

I could see if I had one code but I'm getting 4 separate cylinders. ?

 

[02greysixer]

If you lose connection with one you lose a whole bank (4 cylinders)

Sent from my SAMSUNG-SM-G870A using Tapatalk

 

[TheBac]

O/P, as much as I hate linking to a DF how-to, its the only one with pictures so you can see what greysixer is talking about:

http://www.duramaxforum.com/forum/h...how-ice-pick-injector-harness-connectors.html

I think its the harness running behind the alternator near the FICM bracket. Might be some worn thru wires.

 

[THEFERMANATOR]

If it's an LB7, then check the harness where it passes behind the alternator. If it's an LLY, check the harness where it atatches to a hold down at teh FICM as they rub through underneath there. Sounds like you lost power to one side of the FICM which would shut down that batch of injectors from the FICM, and set all those codes. The most common cause of it is harness rub through at the FICM for LLY's and by teh alternator for LB7's.

 

[ffsteve]

It's a lb7

 

[battlegraduate09]

O/P, as much as I hate linking to a DF how-to, its the only one with pictures so you can see what greysixer is talking about:

http://www.duramaxforum.com/forum/h...how-ice-pick-injector-harness-connectors.html

I think its the harness running behind the alternator near the FICM bracket. Might be some worn thru wires.

Back in the day there were some decent tech threads posted On df. Most Were probably shear accident but a few still exist