Ok guys, it's been a while since I have had the need of some expert advice. My 2019 5.7L Hemi started throwing the P codes above,"in the title". So I had the engine running pulled the plug off 5 and no change in rough idle. So I purchased a new coil and replaced it and have same result. During my second testing with new coil pack on I got another code which is the 2308, which is ignition coli A. My question is; is ignition coil pack A cylinder 8 and ignition coil pack D cylinder 5? If so, could both of them gone bad? Truck has 60K on it and I have not changed plugs yet although I bought her with 40+K.....also I can't seem to find a diagram of the coil packs using the alphabet scheme.....does anyone have that.

 

Pull the plugs, see what they look like.

 

Pulled from 2 different cylinders and they look the same. Also ran compression test on #5, 110 psi

 

Are those stock plugs? They look like some variety of rare-earth feller..... Is that what the label calls for? By the color, it looks like it's burning good though.

 

As far as I know yes they are stock. NGK 1R, 14 per plug * 16. $230

 

Ouch, that farking HURTS...... I know the older trucks really didn't care for the rare earth fellers, but, if that's what the sticker calls for, then run 'em. Still looks good, may wanna check the gap....

You can google search on the P codes, and it will offer suggestions as to which one is which as far as coils vs. cylinders.... So far, I haven't found any rhyme or reason behind the naming scheme, or relationship with the to the codes.... For P020X, and P030X, the X represents the cylinder number, those don't seem to follow that scheme.....

 

Thanks HeyYou, with already performing and knowing that cylinder 5 is the culprit based off all the testing I performed, the one thing I did not take into consideration is the fuel injector being bad. When I get home today I am going to swap fuel injectors 3 and 5, if the issue follows the fuel injector then I know I have a bad fuel injector. I will be much happier with a bad fuel injector that a bad PCM.....I will follow up with my results after the test.

 

Might swap coils in that process somewhere as well..... But, do only one test at a time.

 

Problem has been resolved!!! Cylinder 5 fuel injector was clogged. I had a buddy that works at a Subaru shop and recently had some dodge guys go to work there. He mentioned everything I tried and they said have him test the fuel injector. So I removed the rail and pulled injectors 3 and 5 out, marked them so I didn't get them confused. hooked up a can of throttle body cleaner to a tube taped it up and connected power to pin 1 and had another ground wire ready to go. Had my son hold the can and get ready as I applied power to the injector. At first it all came out the back, then we reset and tested it again and it dripped out the bottom then went to full spray. tested 3 just as a precaution and it was perfect. When I re-assembled everything I placed 5 injector in 3 slot and 3 in 5 so that if this didn't work I would now start to see a misfire on cylinder 3. Well, didn't have to worry about that because I never got another code and truck runs great...