This. Someone who knows how to diagnose a Duramax. We cant do this without being there in person.
De rate / limp mode p2149 and more
- Thread starter Torqueshop
- Start date
It’s my understanding that if one injector loses contact code p2149 indicates it shut off the entire bank
What I have experienced in the past with LB7s is they are very picky on where you position the terminals and how tight the terminal nuts are. I had one a couple years back where it would run like absolute horse manure with the rocker covers on, but take the rocker covers off and run it, it was fine (pita process I know but I had a gut feeling). Put the covers on, did a continuity test on the injector harnesses to ground and #7 terminal (left stud) was touching the rocker cover and shutting that bank down. There were a few people trying to figure it out, I only knew to check there because the owner just did injectors the night before.
But as stated above, there is only so much we can do here without seeing the vehicle. Someone that knows what they are doing needs to be poking around and start diagnosing the issue. Just from my experience and from what I am gathering from your post, I would have the rocker covers removed and inspect the wiring harnesses and the terminals on the injectors. Because at this point none of us know the history on the truck, how many sets of injectors it has had (irrelevant in this case but..) and who worked on it last. For all you know someone paid a monkey to change injectors or something under the rocker covers and butchered things under there.
Digging into these trucks isn't something one should do if they don't know what they are doing. LB7s are very picky on how they are worked on. Not questioning anyone's abilities here but saying this to save you the headache. For all you know you could be opening up pandora's box and you'll be in a world of trouble.
We are always happy to help anyway we can on here but like most said earlier, Its very hard when we are not near it physically seeing whats going on.
The most important tool you def. need when working on these trucks is a tech 2. That and the MDI have been the most important tools in my collection.
Sorry for rambling on..
.
But as stated above, there is only so much we can do here without seeing the vehicle. Someone that knows what they are doing needs to be poking around and start diagnosing the issue. Just from my experience and from what I am gathering from your post, I would have the rocker covers removed and inspect the wiring harnesses and the terminals on the injectors. Because at this point none of us know the history on the truck, how many sets of injectors it has had (irrelevant in this case but..) and who worked on it last. For all you know someone paid a monkey to change injectors or something under the rocker covers and butchered things under there.
Digging into these trucks isn't something one should do if they don't know what they are doing. LB7s are very picky on how they are worked on. Not questioning anyone's abilities here but saying this to save you the headache. For all you know you could be opening up pandora's box and you'll be in a world of trouble.
We are always happy to help anyway we can on here but like most said earlier, Its very hard when we are not near it physically seeing whats going on.
The most important tool you def. need when working on these trucks is a tech 2. That and the MDI have been the most important tools in my collection.
Sorry for rambling on..
.