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Just wanting to know if this has happened to anyone else. Today while waiting for y kid to get out of school, I was parked but car was still running, I popped open the trunk and my DIC said "truck ajar" and then said "check gas cap" and then back to trunk then back to gas cap. I filled my car up 4 days ago and have less than 1/2 tank of gas. I thought it was weird so when I got home, I tried to recreated message but could not. No check engine light came on. It just acted normal.
 

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I may be wrong but I think there was a recal on some models gas caps. Something for you to look into at least.
 

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My guess is that the cap was not tight. I've had that happen on my GMC. Also the cap might need to be replaced. Good luck.
 

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Might also need to clean where cap seats on fillerneck. Also check rubber seal on cap for cracks or even splits.
 

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Chevy Customer Service
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If you like, I’m available to look into recall/warranty information on your vehicle for you. Please private message me the last 8 of your VIN and I’d be happy to help!

Sarah
GM Customer Service
 
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