Notice of "check Gas cap" came up dashboard Tuesday. Gas cap was tight. Repair shop Cleared code - light went out. On Wednesday check Eng light came on. Replaced Gas cap. Repair shop Cleared code again- light went out. On the way home light came back on again. Diagnostic meter says "Emission Sensor Valve" Both times -->i believe was the Code name when they told me to tighten and/or change the Gas Cap which neither worked. Any suggestions?? What & where is the Emission Sensor Valve??
Chevrolet Q&AAsk Your Question
2005 Chevrolet Avalanche 1500 Question: What do I do to fix Check engine light? See Below.
Answer #1Chevy Power August 27, 2012, 12:16Journeyman
The evaporative emission system has a small leak usually it is the fuel cap. It seems like the cap being the problem has been eliminated. A good repair shop should be able to perform a smoke test to find the source of the leak. The canister vent valve is a common failure item on the avalance.
Reply4thgeer, September 07, 2012, 04:51Rookie
Canister vent valve ended up being the fix for my problem. Light went out 2nd or 3rd start-up after that.
Thank you for your help.
Answer #2Greg's Orange Auto (12997 Answers) , Orange, CA - (714) 361-9386globalhelper August 27, 2012, 12:33Master
YOUR EVAP SYSTEM HAS A LEAK YOU NEED TO HAVE IT DIAG IT COULD BE 1 OF THREE SYSTEMS CAUSING THE ISSUE AND OF THOSE THREE IT COULD BE EVVN A BAD HOSE. HAVE SMOKE TEST DONE TO DETERMINE IF THERE IS A LEAK
Answer #3ziptie12 August 27, 2012, 19:14Master
get the specific code(s) from them (if not already listed on your reciept) and post it here , maybe some one with GM experience with it can help get you in the right direction. AND possibly get references for a different shop ?