Cause of code p0496 on a 2008 trailblazer ss

Question

Replaced gas cap already and cleared code, CEL came back on with code p0496 before was p0455. Causes and fixes?

Answer 1

Hi there

This basically means there is a leak in the system and the pressure is dropping even when the canister is not being purged of fuel vapors. Here is a list of possible causes for this.

P0496 CHEVROLET - Evaporative Emission System Flow During Non-Purge

Read more: https://www.autocodes.com/p0496_chevrolet.html