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: 84,756 (11,872–207,600)
9 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009, 2010, 2011
45 people reported this problem
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problem details
2003 Cadillac CTS 64,000 mi,
Ive been having the engine light stay on now.........changed the gas cap.. still on.... 2003 cts v6
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.
2006 Cadillac CTS 38,618 mi,
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.
2003 Cadillac CTS 92,000 mi,
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 CTS 119,000 mi,
same problem with my car check engine light due to gas cap
2009 Cadillac CTS 45,000 mi,
Too lazy to buy another gas cap, doesn't seem to effect much, just an annoying light.
2011 Cadillac CTS 32,000 mi,
c-1 coil gone already ??
2008 Cadillac CTS 46,500 mi,
Check engine light comes on due to gas cap not sealing.
2006 Cadillac CTS 113,000 mi,
Engine light came on due to gas cap vacuum leak
2005 Cadillac CTS 115,000 mi,
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
2009 Cadillac CTS 56,000 mi,
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 CTS 70,000 mi,
Engine light on due to gas cape
126000 miles when problem started
2003 Cadillac CTS 85,000 mi,
I replaced the gas Cap and corrected the problem.
2003 Cadillac CTS 50,000 mi,
replace gas cap
engine light light up due to Gas Cap Issue. I replaced it...
Engine light came on due to gas cap.
2003 Cadillac CTS 146,000 mi,
On dash said check gas cap, took it off, put it back on, corrected problem.
2003 Cadillac CTS 76,139 mi,
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
Check engine light came on took to dealership and they told me the gas cap was loose