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Q: How to get Service Engine Light and Tighten Fuel Cap message to stop on 2005 Chevrolet Suburban 1500

My Service Engine Light in yellow comes on along with a message to Tighten Fuel Cap. I have replaced the fuel cap. How do i get these to stop?
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if the gas cap is the problem, the pcm has to run the monitor and pass for the evap system 3 times and it will turn the light out on its own. it could take several days.
if it does not, then there is another problem that needs to be addressed.

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