Noticed this yesterday after work.. short commute. Decided to turn on the A/C. Service Engine Soon and DSC lights both come on and car seemed to go into "limp mode". Pulled over and turned off A/C and shut off engine. Took off gas cap and made sure it was on correctly. Drove to Autozone and got the free diagnostic check and it came back with codes P0107 and P1688. After a while the SES light went off.. No error lights this morning. Tested the theory about the A/C on the drive home today... same thing happened. Any ideas?