CEL but no codes when scanned?

[digimark]

Weird to me, had a CEL pop up on my early 4xe (w/17K miles) today. Was planning to leave on a week-long trip tomorrow so this caused some consternation. Pulled out my OBD scanner and ran the codes... nothing. Did it again, nothing. Tried a second scanner from a different company, same. Erased all codes. CEL still lit. Drove to the store and back, used all of the battery and about 5 miles of gas engine, CEL still there.

Called the local Jeep dealer service manager. Told them I knew they would be busy but would it be possible to come by tomorrow and have them run the Jeep scanner and tell me if its a problem I can live with or should I not drive it and make other arrangements. They suggested I take it to AutoZone and have them scan it. They of course then heard my worries and re-assured me I could get an appointment for next week. Sigh.

Any advice on this from someone who has experienced a CEL with no related codes? The only thing outstanding on the Jeep is a long-term TPMS light. because driver-side rear wheel won't register. Its currently waiting for a new TPMS module under a prior repair visit but the dealer had to order the part. Would a long-term single issue like that trigger a CEL when it hadn't in the prior 8 months, or is that a red herring?

Thanks in advance.

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[digimark]

Follow-up, we switched vehicles for our trip and took a backup. Didn't want to risk it.

 

[digimark]

Last follow up -- Jeep dealer service advisor said it was the tether for the gas cap stuck under the cap. I find it hard to believe because I've refilled it several times since the light lit, and I'm pretty careful about securing the cap each time, but there you go.

 

[redelses]

Same thing happened last week - CEL but no error codes. Assuming it's the gas cap issue, but there were no error codes though the CEL was still on after a few days. Hopefully it clears soon!

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