Question

2006 Chevrolet Avalanche with engine code P0449, what is the code meaning?

Answer 1

P0449 CHEVROLET - Evaporative Emission Vent Valve Solenoid Malfunction

Read more: https://www.autocodes.com/p0449_chevrolet.html

Start by checking the fuel cap and if the cap is OK the next step is to check for vacuum leak. If no leak are found you may have to replaced the EVAP Vent Control Valve