Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Average mileage: 93,189 (43,000–178,000)
Exhaust & Emissions affected: Gasoline
21 people reported this problem
Frustrated. I have a 2500HD 6.0 with 173,000 mile. Never a problem until now. The check engine light came on, so I had it diagnosed and the code said bad fuel cap. I also informed the mechanic that I don’t have any very little power at take-off. The mechanic said it could also be the catalytic converters are plugging up. I replaced the catalytic converters, which seemed to change the power issue. However, I still have the engine light stating a bad fuel cap. WTF. I removed the fuel cap and the truck starts and runs normal. However, now, when I fuel up the truck, it doesn’t want to start and it takes several cranks to start, and then it sounds flooded.
I don’t know where to start. The truck runs fine until I fuel it up, and then it takes several attempts to start the engine.