Check Engine Light Due to Gas Cap Issue on Chevrolet Trailblazer SS

Problem Description and Possible Solution

A Loose or worn gas cap may cause Check Engine Light to illuminate.

Problem Data
RepairPal Verified
Average mileage: 75,214 (35,000–119,100)
4 model years affected: 2006, 2007, 2008, 2009
12 people reported this problem
Viewing 1 - 5 of 5 comments
check engine light comes on. evap code is thrown. problem not solved.
Check engine light on steady. Also received the "tighten gas cap" message. Will replace cap with new and report back if that doesn't fix it. 7/17/14
tighten gas cap light still on . bought new oem gm cap and that fixed the problem for awhile now its doing it again .
Filled gas tank, started truck, fuel light came on, fuel needle went to empty and CEL came on.
bought a new gas cap but it still getting tighten gas cap