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My truck, which was purchased new (89mi) in April 2019 and has 17,750 on the odo, recently displayed a Check Engine light and showed 'service traction control system' on a recent 750 mi trip. For the past several months I've noticed a bit rougher and lower idle speed (normal is 750 and smooth) when starting motor when warm. It will idle at 650-700 and then go back normal later.

I took it to a Chev/GMC store today, mainly because I had the Check Engine Light, even though it is not illuminated now.

The convulsion/conclusion is that an⁷ 0300 code was indicated on 2 injectors, which the tech said showed intermittent failure. They have ordered the replacements for installation early next week.

This is all news to me because the truck runs great except for the occasional rough idle.

I fuel at major truck stops when fueling my Coach and at other times at what I know to be fairly high diesel volume service stations. I also put in 10 oz Diesel Kleen with EVERY fueling.

Has anyone else had injector issues so 'early' as this?
 

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I would be worried that the CP pump is going south and pushing debris down stream into the injectors. If one of those injectors get really damaged enough at 28,000 PSI it could drill a hole in a piston.
 

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Discussion Starter #3
I will bring your comment to the attention of the tech when I take it back. I wonder if a close examination of the injectors could possibly give a clue as to what caused the failure?
 

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Damn, that sucks. You went above and beyond with the additive and known high volume stations in an effort to not have this kind of problem. I hope you get it sorted soon.

Seems to me that an exam of the injector could reveal if it is debris or simply a bad part. The fact you had two "bad" injectors strongly suggests contamination in the fuel system, possibly fragments from the high pressure fuel pump as SFLTruck said. There is no statistical way two injectors go bad in the same time frame.
 

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Discussion Starter #5
Also, my filters are at 58%, and my front-end plan is to change them at every 3rd oil change which will be in about 2,000 mi. Up

I know some will think this is a bit much, but the filters aren't that costly, and it is something I can easily do when changing the oil and other routine, but necessary maintenance.

I am going to 'push' the tech and service manager next week as to the root cause because I think I have done my job vis a vis fuel. I was told this is their first injector issue on the 2.8, but it seems to me unless they can determine a cause for the failure here, they ought to be able to send it somewhere, the mfr or GM, to ascertain what really happened.

When the work is done next week, I will post an update. I like this truck too much to not followup on this issue.
 
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Yes, please follow up, I bet there are interested readers that are as curious as we are.

I'm in the same camp of really liking my Colorado 2.8. I hope it can go the distance because I get the feeling the next following truck won't make me smile as much as this one does.
 

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Discussion Starter #7
I had the two injectors replaced today. Since we are 2,000+ miles east of my main dealer in MT and volunteering in a National Recreation Area for the US Forest Service, I had to use the local Chev/GMC dealer for the warranty work.

They have one diesel tech who appears to have a lot of experience with the larger motors, but not really much, if any, with the 2.8. So he showed me the two injectors and had a device to 'poke into' the inlet to see if any debris, like from a grenaded fuel pump or other was present, but none noted.

They are sending the parts back to GM for review with the vendor. The tech is presently working on a 2019 big motor where there was an issue with the fuel pump failing and sending debris downstream and causing 6 of 8 injectors to fail. There, even I could see debris evidence.

Anyway, lacking any other evidence, I truly hope it was a vendor part(s) failure rather than something else on the truck.

Oh yes, I they said that when the injector misfires it can cause the Stabilitrak sensors to show a yellow icon to have the Stabilitrak System serviced. That icon and the Check Engine light was why I brought the truck into the shop.

That's their story, and I'm sticking to it because I don't know any better!
 

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My truck, which was purchased new (89mi) in April 2019 and has 17,750 on the odo, recently displayed a Check Engine light and showed 'service traction control system' on a recent 750 mi trip. For the past several months I've noticed a bit rougher and lower idle speed (normal is 750 and smooth) when starting motor when warm. It will idle at 650-700 and then go back normal later.

I took it to a Chev/GMC store today, mainly because I had the Check Engine Light, even though it is not illuminated now.

The convulsion/conclusion is that an⁷ 0300 code was indicated on 2 injectors, which the tech said showed intermittent failure. They have ordered the replacements for installation early next week.

This is all news to me because the truck runs great except for the occasional rough idle.

I fuel at major truck stops when fueling my Coach and at other times at what I know to be fairly high diesel volume service stations. I also put in 10 oz Diesel Kleen with EVERY fueling.

Has anyone else had injector issues so 'early' as this?
I kept getting a check engine light almost on every out of town trip. The truck ran fine with the check engine light so I wasn't too worried about. At first the dealer suggested I used gasoline instead of diesel. Fortunately I keep all my fuel receipts (Chevron and/or Truck Stops). Finally they talked to the GMC rep and he recommended changing the fuel rail. So far no problems but I have only been out of town once (over 200 miles) since. The new diesel engines in California have so many sensors one is always bound to go bad.
 

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Thanks for the update. Sounds like you got a good tech. It is great that he checked the injectors and you were there to see it. Apparently there may be some QC problems with the injectors.

Glad to hear it was not the high pressure pump sending debris into the system - that would be much worse. What a PITA for that big D-Max owner. It is difficult to completely be sure all the "swarf" from a failed high pressure pump is completely out of the system.
 
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