My partners truck came on this morning with.

Tiny
ANONYMOUS
  • 2006 GMC SIERRA
  • 60,000 MILES

HI my partners truck came on this morning with the "check engine light", we went to pep boys, the guy did some scan thing and gave us a code of "P0455" n told us to start by getting a new gas cap n that shuld fix it, well unfortunately they didnt hav the one we needed so we went to auto zone got it, n put it on, started truck and the check engine light still is on? What could this be? Its a 2006 gmc sierra.

Friday, February 15th, 2013 AT 6:56 AM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
  • 25,533 POSTS

Its an evap leak. You need a real diag with a smoke machine, scan tool and voltmeter to determine the failure. Codes never identify bad parts, just failed systems.

Roy

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Friday, February 15th, 2013 AT 10:46 AM

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