Check Engine Light Due to Gas Cap Issue on Chevrolet Avalanche 1500

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

RepairPal Verified
Average mileage: 115,707 (47,000–189,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
26 people reported this problem
13 people shared problem details
Problem: engine light on due to gas cap. I bought new gas caps several times. Now it says tighten fuel cap.
Changed Gas Cap like Auto parts repair said to do and did not fix the problem.
check engine light and tighten full cap display
I've had a continuing "check engine" light from a code indicating a vapor leak in the fuel system. After a couple of times resetting the light with a portable instrument (after clicking down on the gas cap), I changed the cap. That was in late February of 2012. Just last week, after getting fuel, the check engine light is on again.
Light was on, then reset by my repair shop. They said to drive it 50 miles and come back. I drove it about 70 miles and it came back on. Cause and repair are undetermined at this time.
MIL light came on and OBDII code reader indicated an "Open EEC Circuit" condition. Problem cleared by replacing gas cap with a "new" lockable cap and resetting the MIL light.
Tighten Fuel light cap according to the dashboard notice. Went to Rick Hendricks service center was charge $107 dollars to check the engine lights code they told me it was code P0455 vent solenoid shorted internally i got it replace in 2013 by the same service center now its broken again wants to charge me more than what they got it the last time.
Put locking cap on truck , so far so good.
check engine light Tighten gas cap new gas cap no change
Check engine light came on in 2012 after gassing up and is still currently on.
Autozone verified code and cleared it out for free.
same issue replace cap still cjeck eng lighy
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