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.

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Average mileage: 114,472 (47,000–189,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
24 people reported this problem
12 people shared problem details
Changed Gas Cap like Auto parts repair said to do and did not fix the problem.
4 people like thisFlag inappropiate
Problem: engine light on due to gas cap. I bought new gas caps several times. Now it says tighten fuel cap.
3 people like thisFlag inappropiate
check engine light and tighten full cap display
2 people like thisFlag inappropiate
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.
2 people like thisFlag inappropiate
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.
1 person likes thisFlag inappropiate
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.
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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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