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Posted (edited)

Looking for some advice. I have these 3 evap codes p0449, p0446, p0451 and cant seem to find the source. Ive replaced the vent solenoid and the purge solenoid nether changed any codes.

 

Truck is a 2013 GMC Sierra 1500 SLE 5.3 V8

Edited by RichardRS
Posted

Welcome to the Forum! Always post the code definitions along with the codes. there are over 18000 possible codes, no one remembers them all and most will skip over your post rather than look them up

Posted

charm.li (website) has GM's diagnostic procedures for each of those codes.  GM recommends working them one at a time, lowest number up.

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