[Trood74lly]

2004.5 gmc 2500hd duramax
looking for some insight on this code. The truck runs awesome and this is the only code in the system even after a couple thousand miles.

 

[OkDually]

2004.5 gmc 2500hd duramax
looking for some insight on this code. The truck runs awesome and this is the only code in the system even after a couple thousand miles.

Welcome to DieselPlace

Here is a thread with some info on the p0612 code

P0612 code need some help

i keep getting this code, i looked it up and i know what the code is i just don't have any idea on where to look for the problem or how to fix it, any ideas, thanks 03 2500 HD EFI live FASS Banks Ram Air Banks wastegate 5 inch exhaust sun coast stage V

www.dieselplace.com

 

[Trood74lly]

Welcome to DieselPlace

Here is a thread with some info on the p0612 code

P0612 code need some help

i keep getting this code, i looked it up and i know what the code is i just don't have any idea on where to look for the problem or how to fix it, any ideas, thanks 03 2500 HD EFI live FASS Banks Ram Air Banks wastegate 5 inch exhaust sun coast stage V

www.dieselplace.com

I looked through that thread and found something about a power for the ficm being different in the slot between gas and diesel. The fuse box I'm using is out of an 8.1 because mine corroded really bad and I swapped it out. Was wondering if that could be the reason for my code. If not where should I start for diagnosis.

 

[OkDually]

I looked through that thread and found something about a power for the ficm being different in the slot between gas and diesel. The fuse box I'm using is out of an 8.1 because mine corroded really bad and I swapped it out. Was wondering if that could be the reason for my code. If not where should I start for diagnosis.

It could be the issue..

Look for any wire chafing around the FICM especially around the support bracket.
Inspect the engine harness in general, looking for any worn wire insulation, corrosion, loose connections, broken wires, etc.

The duramax harness is known for wire rub through issues

 

[Trood74lly]

OK when I get some time lol I'll have to do that. The light went out for about a week then came back on just the other day. So kinda thinking it might be a rubbed wire but we will see. I'll keep ya updated thanks