Aaaaah, so it has happened before! Maybe this is a 3-plug BE/BH issue... But WHY is the big question, hmmmmmmm.
member sorting my auto sparkys back to front wiring, I get same CEL code maybe once every 2 weeks, seems to happen when you start car then turn off for whatever reason then start again quite quickly again. As mentioned above doesnt effect driving whatsoever so have just lived with it. Strange though, my guess was diff pressure sensor not liking ssq controller over ridding it (you prob already know that though)
cheers