P0606 on First Read?

[trudynosports]

I read out a stock 06 Pontiac Solstice today. The read went fine and the stock file is attached. Went back out to the car about 15 mins later and started it up to leave and the check engine light was on. The code was a P0606. Why would this code set when just doing a read? No problems were detected during the read. Should I even attempt to flash this car? I'm afraid that it might not flash correctly and leave the car dead.