My engine light should come on with the gas cap off

2006 HUMMER H3
76,000 MILES
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RYAN8624
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  • 6 POSTS
I noticed I forgot to put my gas cap back on when I got home from work about 9 miles. This truck if the gas caps off the engine lights should come on right away so why would it not come on?
Apr 11, 2012 at 12:24 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
it has to fail the evap test 3 times. the test only runs after an 8 hour cold soak. it would take a day or to to be turned on.

Roy
Apr 11, 2012 at 12:26 AM
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RYAN8624
  • MEMBER
  • 6 POSTS
O okay thanks and I don't know if I can ask one more thing what's an air solenoid relay for and if I have a fuse that says air sol why is there no relay for it
Apr 11, 2012 at 12:29 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
you may not have the air pump. may be just a california option.

Roy
Apr 11, 2012 at 12:31 AM
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