I also am having the same issue with my p180 RXI I just received it back from service for a new kero plug and ECU was also updated.
I flew 3 flights the week it came back and 3 the next weekend with no issues when I went to start for the fourth flight I get the OC:OVER CURR message I also changed out ecu pack with spare and no change. I emailed Jetcat twice with no response back. I just wanted to know from them if it needs to be sent back or gsu setting could fix. Keep us in the loop if you figure out your issue/

Thanks Scott