P0446 GMC -

Question

Have a 2001 4.3 sierra with the po446 code. Did the vent solenoid update the canister and purge valve and after aprox 90 miles the same code comes up. Need to get this through AZ emmisions., already got a $500.00 ticket for expired tags plus all the parts cost.

Answer 1

HI there

On some of these will rust  and  plug off the steel lines for the evap system, it's also possible some of the canister was sucked into the line, so make sure it's clear. A faulty fuel pressure sensor will cause this code as well.

P0446 CHEVROLET - Evaporative Emission Vent System Performance

Read more: https://www.autocodes.com/p0446_chevrolet.html