I have a 2015 Journey 40U and just had a complete PM performed at Freightliner in Austin, TX about 600 miles ago. Today, the engine warning light came on as I left a park, I was unable to stop due to the location and a driving rain storm. The only thing I have done differently was use Diesel Tec DEF as I could not find Blue DEF that I have used in the past. The coach has 22K miles. Any suggestions.