05 duramax question

jonesin

Well-known member
My 05 duramax was cruising down the highway and just went "blah!" it kept running but barely and I was able to get off the highway. I turned it off, wiggled the wires to the aftermarket chip, started it and drove it home. I took a test drive the next day and it did the same thing after leaving the driveway.
The thing that gets me is that it will usually start normal, idle fine for a minute or so and then will go "blah!" and start knocking and running really rough to the point where you cant rev the motor at all, I assume the computor is limiting that due to the knocking...
I know that this is vague, without being able to see it, but here it goes:

the injectors have been done once before and it has been fine up until sat, no indication of injector trouble
the fuel filter was just changed 300 miles ago
I disconnected the aftermarket chip and unhooked the battery for a couple of hours and after idleing for a min or two it happened again

I had a neighbor hook up his computer to it and got the following code failures:

1. P0207 inject 7 control circuit
2. P0670 glow plug control circuit
3. P2146 injector positive voltage circuit group 1

I am probably going to pull it, tow it or what ever to a garage, but I was just wondering if anyone is knowledgable in this area
Thanks ahead of time to the JD family
I know, I should have bought a ford, the funny thing is that I had a rusty, trusty ole dodge that I sold when my boss made me an offer that "I couldn't refuse" on his "old" truck, does that cover all the brand bashing? :)
Thanks again!
 

fusionfool

New member
My 05 duramax was cruising down the highway and just went "blah!" it kept running but barely and I was able to get off the highway. I turned it off, wiggled the wires to the aftermarket chip, started it and drove it home. I took a test drive the next day and it did the same thing after leaving the driveway.
The thing that gets me is that it will usually start normal, idle fine for a minute or so and then will go "blah!" and start knocking and running really rough to the point where you cant rev the motor at all, I assume the computor is limiting that due to the knocking...
I know that this is vague, without being able to see it, but here it goes:

the injectors have been done once before and it has been fine up until sat, no indication of injector trouble
the fuel filter was just changed 300 miles ago
I disconnected the aftermarket chip and unhooked the battery for a couple of hours and after idleing for a min or two it happened again

I had a neighbor hook up his computer to it and got the following code failures:

1. P0207 inject 7 control circuit
2. P0670 glow plug control circuit
3. P2146 injector positive voltage circuit group 1

I am probably going to pull it, tow it or what ever to a garage, but I was just wondering if anyone is knowledgable in this area
Thanks ahead of time to the JD family
I know, I should have bought a ford, the funny thing is that I had a rusty, trusty ole dodge that I sold when my boss made me an offer that "I couldn't refuse" on his "old" truck, does that cover all the brand bashing? :)
Thanks again!
Have you noticed any thing with the temperature before this happened. Reason I ask is my 01, had a blown head gasket after they changed US to low sulfur diesel the Duramax started running much hotter. It started with temp rise, and then quick drop. Coolant level was be normal while at stand still, but low level while temp raised, and drastic temp changes. I kept taking back to dealer stating I thought it was a head gasket issue. They said no, did not seam to be the case. They replaced both thermostats. Then 20 min into a drive, same thing you stated: Blah loss of pressure / power. Seeing as how I was on a vacation "snowmobiling with enclosed trailer in tow", I dumped the truck and traded off for different truck. Figured by the time they would tear it down, surface the heads, and put back together my vacation would have been over.
 

jonesin

Well-known member
nope, temp seemed fine, even when it went "blah" the guages read normal
I don't know, but am hoping that it might be a sensor of some sort becouse of the fact that it will start and run normal for a minute before it starts running rough
thanks, i'll keep it in mind and double check the coolant
 

Modman440

New member
WHo did your injectors and did they use reman or new??? im not overly familar with duramax diesel but ill give it a try my ford did the same thing and it was an injector that i had replaced with a reman and it went bad but it was other things also my after market tuner and chip some how got hot and were telling my computer that i was dumping to much fuel into my system and leaned it out to the point of going boom it knocked and clunked scarred the snot outa me thought it was gonna blow... Its hard to tell since noone on here can look at it... this is from my personal exsperience not saying its the same for you but maybe itll help you break things down and find the issue best of luck!!!
 

boatingbent

New member
Go to your GM dealer ...They had a recall on the 05 D-Max`s tell them your Fuel Rail Wiring has gone to **** .....
My 05 did this with about 35000 Miles on it ....Mine was the right side Fuel Rail makes the truck run on 4 instead of 8 ......I know when mine went I thought something real bad went to **** inside the engine but all it was was the Fuel Rail ...Its about a 10 minute fix .....Under your Fuel filter there is a Plug that you can unplug and plug back in and then it will quit ...It could Quit for 5 minutes or 10 hours no one knows
 

anonomoose

New member
I doubt it has anything to do with the fuel delivery or it wouldn't start and run for a minute before acting up. Could be wrong here but seems this problem occurs AFTER the initial start and run without the EPA stuff kicking in. Once the motor is running...then seems that this is when all that stuff turns on and then starts running rough. It is likely to be computer related running the normal loop after the warm up loop is passed over.

Please let us know what it turns out to be...this is an interesting thing to have happen even if it is going to cost you some money.
 

jonesin

Well-known member
WHo did your injectors and did they use reman or new??? im not overly familar with duramax diesel but ill give it a try my ford did the same thing and it was an injector that i had replaced with a reman and it went bad but it was other things also my after market tuner and chip some how got hot and were telling my computer that i was dumping to much fuel into my system and leaned it out to the point of going boom it knocked and clunked scarred the snot outa me thought it was gonna blow... Its hard to tell since noone on here can look at it... this is from my personal exsperience not saying its the same for you but maybe itll help you break things down and find the issue best of luck!!!

Our company does its own maintanence and this was my boss's truck, I'm not sure about remanufactured or not, I could check into it. They usually don't skimp on things like that, we do all our maint on the trucks, cranes, loaders, skytracks and such, he's pretty good. I'll have to check the records to see when the injectors were done, anything that was questionable was done, waterpumps, transfer case, etc the truck has 280,000 on it and is still rust free and looks new, the boss is kind of anal that way, would never drive a dirty truck and always has to have the best.
 

jonesin

Well-known member
Go to your GM dealer ...They had a recall on the 05 D-Max`s tell them your Fuel Rail Wiring has gone to **** .....
My 05 did this with about 35000 Miles on it ....Mine was the right side Fuel Rail makes the truck run on 4 instead of 8 ......I know when mine went I thought something real bad went to **** inside the engine but all it was was the Fuel Rail ...Its about a 10 minute fix .....Under your Fuel filter there is a Plug that you can unplug and plug back in and then it will quit ...It could Quit for 5 minutes or 10 hours no one knows

thanks, i'll have to check if that was done, this truck has 280,000 on it so hopefully it was!
 

russholio

Well-known member
Although I haven't experienced anything like this, I'm interested in hearing the diagnosis as well, since I have the same year truck. Have you tried posting your question on any of the diesel forums?
 

mjd45

New member
My 05 did the exact thing last year. Shut down cruising down the highway and went into limp mode. Took it to the mechanic and it was the fuel rail wiring that caused the #2 and #7 injectors to go bad. If i remember it was like $1200.00 to fix.
 

jonesin

Well-known member
My 05 did the exact thing last year. Shut down cruising down the highway and went into limp mode. Took it to the mechanic and it was the fuel rail wiring that caused the #2 and #7 injectors to go bad. If i remember it was like $1200.00 to fix.

would it ever start up and idle normal or run fine after it shut down but before you got it fixed? last night it idled for 10 minutes and then went 3 miles down the road before happening, i shut it off waited a minute and started it and drove it home
 

mjd45

New member
It would for maybe a minute or so. Then back to limp mode. I only tried it a couple of times before it went in to be fixed.
 

mjd45

New member
Did some research and this it what i had. Not the fuel rail. I also noticed that I had all the glow plugs changed at that time, so the price may not be as high as 1200.00

Injector Harness break( your engine will go into limp mode and only run on 4 cylinders. it will have a reall lound crackle sound like starting it on ether. This is a porblem on all lly and lbz engine. #2 and & 7 injector connectors gets replaced. GM sells a kit to lengthen the harness do it is not in a bind pulling the pins out of the connector[/B]
 

Modman440

New member
boating bent makes a great point a guy in my shop told me same thing when i asked hes a duramax nut has an 05 same issue. Im confused tho as to why is makes it run bad after a few min and not right away please keep posted as im very intersted
 

boatingbent

New member
GM did not do a recall on the fuel rail ...What I was told was they would warrenty the new wiring Harness only if they went bad ....At the time mine went i told the dealer to just go ahead and get 2 new harnesses coming being that my Brother had the excact same truck as mine ...They said no they will only replace em if they go bad .....next time it acts up you could try to find the plug under the fuel filter and unplug it and plug it back in ...They fuel Rail Harness I believe back then was around $100....
Oh BTW my brother still has his 05 with approx 125000 on it and he to date has never had this problem with his
 

dj2muchjunk

New member
You mght want to suspect the after market chip. I was told some chips disable the oe computer and the trouble codes are not avalieable.
 

jonesin

Well-known member
Last night I was able to get both the #1 and #7 injector clips loose but they are sooo small that you really cant see any discolorization and cant really clean them like I had hoped.
I plugged it back together and started it, no engine lights or anything came on, idled perfect for 5-10 minutes, I went down the road about 2 miles and when I came to a stop sign it happened again.
I turned around, shut it off for a minute, started it up and made it about 1/2 mile before it happened again, stopped, shut it off, wait a minute, started it and drove it home.

I had hoped that unplugging and plugging the injectors would possibly clean them off and regain contact, but no

Oz, the guru at the dealership said the other day that its almost like the clips are "burned out" but that its just a little discolorization that is visible, hard to tell.

The truck is too big for my friends dolly, so its either pay $100 or find a friend to pull me to the dealer 15 miles away

Kind of funny that the last time I had to tow a vehicle, it was in my first truck 15 years ago, (it was a chevy too)

I do appreciate all the comments and ideas

Ill let you know what happens
 
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