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Chevrolet Avalanche 1500 Problems

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

Problem Description and Possible Solution

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

(37 people reported this problem)

Chevrolet Avalanche 1500 Vehicles With This Problem

RepairPal Verified
Average mileage: 115,707 (47,000–189,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
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Viewing 1-13 of 13 comments
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.
Problem: engine light on due to gas cap. I bought new gas caps several times. Now it says tighten fuel cap.
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.
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.