What is your question?
·
·
What is your question?
My check engine light came on and got it check it came back po440 I got a new gas cap and change the purge value so the only thing left in the canister vent
How long has your 2002 GMC Yukon had this problem?
Month
1 Reply
Located over rear differential - unless it has been re-located as per GM TSB that was issued some years back. Keep in mind there could be a leak *anywhere* in the evap system causing code PO440 to appear. Good luck!