04 duramax injector misfire - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 4 (permalink) Old 01-15-2020, 02:07 PM Thread Starter
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04 duramax injector misfire

Hi guys my duramax is misfiring sometimes. Showing injector circuit open cylinder 1 , 4, 6, 7 as well as fuel injector group A supply voltage circuit open. Im assuming this has to do with the firing pattern and would like to know what connector is and location of it. As it must be causing the problem. I would really appreciate the help as its my daily driver.
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post #2 of 4 (permalink) Old 01-15-2020, 02:54 PM
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Check the connectors on the ficm, and the connectors near the valve covers for good connections and that no pins have gotten bent or pushed out. Also check the wiring for rubs next to the alternator. Has it been apart recently or did this start as you were just driving down the road?

I put injectors in a truck a few weeks ago and when I started it I knew immediately there was a problem. It was running in what we call 'Kubota mode' because it had a dead injector. Codes showed it was number six injector besides the codes like yours. You may simply have an injector that has no continuity through the solenoid or possibly a ficm issue.

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post #3 of 4 (permalink) Old 01-15-2020, 09:33 PM Thread Starter
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Yeah it just started while driving one day and is intermittent. Thats hilarious that you call it kubota mode, when it happend i was like what the hell it sounds like a f**kin 3 cylinder kubota haha.
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post #4 of 4 (permalink) Old 01-15-2020, 11:20 PM
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If you have a 2004.5 LLY, then it is almost certainly an injector connector. You didn't list the codes, but my crystal ball says P0207 and P2146. P0207 says that #7 is the culprit. It's almost always #2 or #7.

It seems that GM wanted to get your attention if there was a problem with one cylinder. I mean, it would probably still run pretty darn good on 7 cylinders. So if 1 goes, they shut down 4.

For me, it was #2 (P0202/P2149). You can search for "ice pick" to get an idea of the problem, and one solution. I stuffed aluminum foil in the connector when I was miles from nowhere. It would go 35 miles and happen again. More aluminum foil and it got me somewhere. Since then, I bought a bunch of cheap injector connectors from Amazon (4 for about $16), soldered a 2-way connector on the harness, soldered the other half of the 2-way connector on a new injector connector. I only did it for #2 and #7. I have lots of spare injector connectors with 2-way connectors. The idea is if a failure occurs on the road, I can just pop on another connector. It's been over 2 years and the cheap injector connectors have worked perfectly.
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