code po449: need help
bobboinge
04-08-2007, 09:07 PM
I have this po449 code. Changed gas cap already and looked everything over. Any ideas????
2003 sierra 5.3 T ....
2003 sierra 5.3 T ....
maxwedge
04-09-2007, 04:00 PM
Check this link. http://service.gm.com/gmspo/mode6/pdf/1999/99t57R_LD_tE.pdf, this requires tracking down vent solenoid issues, I guessed at you trucks year as you did not post it ( must)
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