Chevrolet Silverado 2500 HD Problem Report

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

(15 reports)

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

CHECK ENGINE LIGHT COMES ON THE IT SAYS TIGHTEN FUEL CAP ON THE DASH -
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. -
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. -
between 250,000- on ,,, I had my mechanic check this out and all indicated a bad gas cap . Replaced gas cap and reset the check engine light .. Truck continued to run ok.. however each year at the approximately the same time right before state inspection the engine check light comes on again. The mechanic replace two evap sensors however the problem continues to reappear each year... anyone have any suggestions ?? -
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.