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2004 Chevy Cavalier P0455 EVAP System Leak Detected

Tiny
LISALU44
  • MEMBER
  • 2004 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • MANUAL
  • 65,000 MILES
I have received the P0455 error code and it isn't the gas cap. What else can it be and how can I diagnose the problem?
Thursday, April 22nd, 2010 AT 8:34 AM

2 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
You need a scan tool and a smoke machine to really figure it out. But most likely its the vent valve. I would replace that and the gas cap.
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Thursday, April 22nd, 2010 AT 2:39 PM
Tiny
JACK1959
  • MEMBER
  • 3 POSTS
I recently had a Chevrolet Sunfire which is the same as the Cavalier with a gross leak detected P0455. I ran a smoke test and found that the leak was coming from the top of the fuel tank where the evap hose connects to the tank. I had to drop the tank and re-install the hose. Cleared the code and never did reset again.
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Thursday, April 22nd, 2010 AT 2:42 PM

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