It's an old thread, but I'll add to it....
Same symptoms, CEL, Flashing CC and "ER HC" under the trip odometer. Autozone spit out the P0600 code.
Interestingly someone else in the thread said they were experiencing jerky acceleration. I've been having the same problem at low RPM when first starting out it's seems jerky until the turbo kicks in. The mileage is pretty bad too...Getting like 16-21 in mostly city driving, but I'm not hard on the car. Even on long trips where its 70%+ highway I'm getting 23....
I have 2,500 left on the PT warranty, so let's see what Subie has to say....