Hi everyone, my brothers car is acting up, misfire during normal driving, and when idling, his turbo is surging making the whole car shake a bit on and off. Anyway, he took it to the dealer and they said he was getting the DTC p1231 and the Throttle Body would need to be replaced. I wanted to find out what this code was, but I cant find any info online. It's not everyday that you just replace the throttle body though. Can anyone enlighten me on what this code means? Thanks!