If the emissions warning light comes on & then goes out after 2 tankfuls of gas, do I still need to have it checked out

Asked by Aug 23, 2013 at 03:55 PM about the 2012 GMC Canyon SLE1 Crew Cab

Question type: Maintenance & Repair

Just after filling up at a name brand gas station on a recent trip to AR, the emissions warning light came on.  We checked the gas cap; fine.  The light remained on throughout that tankful & the next, so I had our local GMC dealer check the truck out once we got home.   I was told they needed to replace some type of wiring harness; it had to be ordered.  The day before I was to take the truck back in for the repair, the emissions light went shortly a new tankful of gas.  The truck ran fine, no hesitation, rough idle, nothing but smooth performance throughout this whole deal.  Do we still need to proceed with the repair?

4 Answers

You've got to learn to STOP at the FIRST click...I kid you not, this is a hard habit to break, but once there is a long pause from filling and comes to a stop....DO NOT try to add more gas...it will flood the charcoal canister and temporarily disable the emissions control system~~

1 out of 1 people think this is helpful.

in short....DO NOT fill your tank...have someone who knows how to stop at the first click, thus saving your canister~

1 out of 1 people think this is helpful.
63,305

What trouble codes did the GMC dealer find? There is a sensor that monitors the pressure inside the gas tank. Replace your gas cap. It may be leaking and you'd never know it. But the computer will pick it up because of that pressure sensor. You should get a trouble code for the EVAP system (gross leak detected) if it's the gas cap. HTH. -Jim

3,745

packnpaddle, If you would like for us to speak with your GMC dealership in regards to your concerns please let us know. Email us your name, VIN, address, phone number, mileage, and name of your GMC dealership to socialmedia@gm.com. Erica Tiffany GM Customer Care

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