2015 Fitzgerald Coronado 12.7 Detroit diesel. The title here pretty much says it all, going up a hill or anytime the turbo is boosting the check engine light comes on then goes off when going downhill or engine has no load. Any suggestions on where to start looking?
Check engine light with turbo boost.
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by FitzNado, Dec 14, 2021.