Check Engine Light Due to Gas Cap Issue on Chevrolet Silverado 2500 HD

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 80,658 (43,000–173,000)
Exhaust & Emissions affected: Gasoline
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
14 people reported this problem
4 people shared problem details
CHECK ENGINE LIGHT COMES ON THE IT SAYS TIGHTEN FUEL CAP ON THE DASH
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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.
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Check engine came on when engine was started . Did code check... it said evap problem . Gas cap o ring showed light wear . Installed new cap and cleared code ... check engine light off on restart.
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gas cap turns engine light on...
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A loose or worn gas cap could be cause the Check Engine Light to illuminate.

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