guidry wrote:
After about a half tank towing on the freeway all day my check engine light came on and the manual shows it to be emissions related. Diesel cap is ok, I'm guessing bad batch of diesel (truck stop). I added new diesel to top off the tank. Truck has only 13,000 miles. Could it be the bad diesel or maybe air filter? I'm having it put on a scanner tomorrow but figured someone here might have experienced this before. Truck is running fine, even pulled 5th wheel up a 7% grade like nothing.
Thanks
My vote is your truck is reporting "Contaminated DEF" that I see so much with the GM diesel trucks.
