Check Engine Light Due to Gas Cap Issue on Cadillac CTS

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

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Average mileage: 80,369 (11,872–180,000)
9 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009, 2010, 2011
44 people reported this problem
21 people shared problem details
2003 Cadillac CTS64,000
Ive been having the engine light stay on now.........changed the gas cap.. still on.... 2003 cts v6
2006 Cadillac CTS38,618
Cap was loose and caused check engine light. When tested error read as some kind of leak. But, all was needed was to tighten the gas cap and have the error message removed.
at 48000 miles the check engine light has come on 3times the the car dealer replaced a sensor to the gas tank and it came back on. The GM dealer said it was the wire to the sensor. A week later it came back on. They spent 4 hours trying to figure it out. They reset it. Now at 54000 miles it is on again. I am thinking somebody at on star is putting the light on. I had simular problems with my 97 catera oillight. And now my warranty is done. The front passanger shock is making noise. The auto trac and auto stablization is out of control.
2003 Cadillac CTS92,000
Ingine light came on and I had it checked for free at NAPA and was told that probably the gas cap not sealing correctly and to replace this first...... Replaced the cap at a cost of around $8 and that fixed that problem... By the way NAPA had the replacement cap right there in their store... No service charge just the purchase of the new gas cap... Problem fixed and light off!
2003 Cadillac CTS119,000
same problem with my car check engine light due to gas cap
2011 Cadillac CTS32,000
c-1 coil gone already ??
2009 Cadillac CTS45,000
Too lazy to buy another gas cap, doesn't seem to effect much, just an annoying light.
2003 Cadillac CTS85,000
I replaced the gas Cap and corrected the problem.
2003 Cadillac CTS50,000
replace gas cap
2006 Cadillac CTS113,000
Engine light came on due to gas cap vacuum leak
2005 Cadillac CTS115,000
I am in the process of purchasing this year Cadillac and the dealer is saying he will get it smog tested and the check engine light came on now I know why it's taking so long hopefully it will get fixed and I won't have anymore issues
engine light light up due to Gas Cap Issue. I replaced it...
Engine light came on due to gas cap.
2003 Cadillac CTS146,000
On dash said check gas cap, took it off, put it back on, corrected problem.
2009 Cadillac CTS56,000
Traded this car to my sister and noted engine light on shortly after she got it last spring. Also the high beam light bulb wasn't working. Cost her $500 to get it replaced (fixed) So much for trying to give her a decent car.
2006 Cadillac CTS70,000
Engine light on due to gas cape
2003 Cadillac CTS76,139
the gas cap msg has come one twice since I bought the car just over 60 days ago. I've had no other problems with it till now. Now the check engine light is on
126000 miles when problem started
2008 Cadillac CTS46,500
Check engine light comes on due to gas cap not sealing.
Check engine light came on took to dealership and they told me the gas cap was loose
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