My check engine light came had it checked was.

Tiny
ANONYMOUS
  • MEMBER
  • 2007 GMC YUKON
  • 60,102 MILES
My check engine light came had it checked was told the gas cap was loose replaced the gas cap light is still on what can I do to get the light turned off
Monday, October 29th, 2012 AT 10:25 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,870 POSTS
The related fault codes refer to a "small evaporative emissions leak" or a large one. Codes never say to replace parts. The loose gas cap is only one of many possibilities for a large leak. You don't replace the cap for that; you tighten it. If the cap is tight, you have to check the rest of the system. Start with a visual inspection of all the hoses, valves, and clamps. If you don't see anything obvious, a smoke machine is the best way to find it. You inject a white, non-toxic smoke at 2 psi and watch where it sneaks out.
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Monday, October 29th, 2012 AT 11:07 AM

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