[thegame7]

My 2007 V8 has been acting a little funny lately when its cold. This morning it seems it was almost hesitating with a slightly erratic idle from 750-500rpm. Decided to check the Scangauge and found there are constant pending codes that start with C, like C2900 C29A0 C2600. And when I say constant I mean like every couple seconds it throws another pending code. I can't do anything with these because there isn't an actual check engine light but driving any distance there might be hundreds of pending codes.

If these are constant pending codes I'm thinking its for something that is constantly running like a fuel pump maybe. Weird thing is, once everything is warm, the hesitation/slightly erratic idle goes away and it runs fine. Truck has 225k miles on it. Checked vacuum lines and it doesn't seem like any popped off. Any ideas??

[thegame7]

Looking at how to read DTCs on YouTube and it does seem to be an injector circuit malfunction (fuel or air).

[thegame7]

Actually C2900 might suggest transmission issue, ****. C for chassis, 2 I think is manufacturer specific and 9 is transmission. Wonder if this is related to me doing a complete trans fluid flush like 9k miles ago...

[thegame7]

I think the Scangauge was going haywire. I reset it to default settings and it finally popped up with a P0304 code which is cylinder 4 misfire. Fantastic! Definitely explains the stutter

[thegame7]

Quick coil pack swap with cylinder 2 and the problem moved. Woohoo! New Denso units arriving Sunday. Hoping I can make it to work and back today lol

[MikeinNH67]

Good job, I was wondering about those codes as they didn't look typical.

[thegame7]

Originally Posted by MikeinNH67

Good job, I was wondering about those codes as they didn't look typical.

Yeah it threw me a loop for sure.