Check engine light came on and ran my ScanGauge. Threw the P0004 code which means Fuel Volume Regulator Control Circuit High. The car runs fine. This happened after the car was parked for three or four days. I have had a few rough starts when it is cold back a few months ago but haven't noticed it lately. Any thoughts? Could this have been due to a cold start or should I just dump it off at the dealer. 2016 Sport HB.