Code PO355

[Floorboard]

Having a problem with my 2003 Dodge Ram Hemi 5.7. Has a code PO355 and don't know what it could be. I've changed the number 5 coilpac and still have code, anyone had to deal with this?

 

[HarryS]

First, when you suspect a bad coil, don't replace it, swap it with a known good one, and see if the issue moves. Then pull the plugs and check plugs and do a compression test.

 

[jws123]

Having a problem with my 2003 Dodge Ram Hemi 5.7. Has a code PO355 and don't know what it could be. I've changed the number 5 coilpac and still have code, anyone had to deal with this?

Have you overheated it recently or anything