Spn 274203 fmi 5

2016 freight liner cascadia.dd13. I can't find this code anywhere.
At idle rpms bouncing between 5500 rpms and 6k. Then will level off and do it again.
About six months ago injector 4 was replaced. But the serial number of the injector had not been entered in yet. I don't think that's the cause, namely because this is only a day or two new issue.
I down loaded two spn code books and could not find it. Ill let the boss know Tommrow. But if its something I can tighten or clean id rather not give another 4 hours to the T A.
Any help would be fantastic. Thanks in advance.
Edit: I just tested the high idle. It has the same 500ish rpm variance.

 

Thanks guys.!!

@Ridgeline where did you find the code?

 

@AModelCat . lmao
Good catch didn't realise I added a extra 0.