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.....