Check Engine Light Due to Loose or Worn Gas Cap on Cadillac STS

A loose or worn gas cap could be cause the Check Engine Light to illuminate.

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Average mileage: 81,600 (28,000–145,000)
6 model years affected: 2005, 2006, 2007, 2008, more2009, 2010
11 people reported this problem
3 people shared problem details
2007 Cadillac STS28,000
STS V8, "check engine light" comes on occasionally, dealer states no trouble codes are evident, has no idea how to repair, GM will give no assistance, after creating a complaint file on it.
2006 Cadillac STS80,000
Last seven months the check enine light keeps coming on. dealer shows no interest in repair or trouble shooting.
2005 Cadillac STS145,000
Rough idle and about 55 to 60 mph rough ride That smooth out about 70mph could this be the evop purg pump
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