2004 Chevy Impala Evap P0440 code

2004 CHEVROLET IMPALA
45,000 MILES • 6 CYL • FWD • AUTOMATIC
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ROB422
  • MEMBER
  • 1 POST
replaced fuel cap, code came back. what could be the problem
May 27, 2008 at 5:31 PM
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RHALL77
  • ✓ASE Certified Mechanic
  • 3,361 POSTS
  • ASE Certified Mechanic
a vent valve could cause the problem also. did you replace that
May 30, 2008 at 9:08 AM
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