Misfire Code?

Coil failure can be caused normally by excess current flow. You say you swapped the coils; did you also change out the spark plugs? A worn plug will have a wider gap that takes more current to jump the gap. That can place a higher load on the coil and cause failure. Kia vehicles tend to be picky about coils as well. Many of the aftermarket coils don't seem to hold up. The other failure point is if the driver transistor in the PCM shorts out and instead of firing the plug it just locks the coil on. The easy way to test for that is simple, the coils are fed battery power from the main relay on one terminal. The PCM fires the coil in time by grounding the other terminal. To test you just unplug the coil and put a 12-volt test light across the 2 terminals. When you start the engine, the light should pulse every time it fires the coil. What you want to watch is that the light actually goes out. If you connect the light and turn on the ignition the light should be off, if it's on then the coil ground is either shorted to ground or the PCM is shorted. To test if it's the PCM you can disconnect the battery and then unplug connector C01 from the PCM. Then look at the 4 terminals in yellow. Unplug all 4 coils. Now connect a test light to battery positive and go to the harness connector you removed from the PCM. Just touch each of the coil driver pins, you don't want the light to turn on. If it turns on then the wire is shorted to ground. If the light was staying on when you did the first test with the light in place of the coil, but none of the wires show them shorted then the PCM is the likely issue, it is trying to keep coil three on full time, to repair that you replace the PCM.

Thank you very much.

You're welcome.