Code P0455?

2004 BUICK CENTURY

150,000 MILES • 3.1L • V6 • AUTOMATIC

PATTIE MORRIS

MEMBER
1 POST

Car runs fine, but intermittently stalling every couple days. I replaced the purge solenoid valve and small u-shaped hose. The car ran good after that for a couple days then stalling again. I checked the fuel cap it seemed tight. I can’t see any cracked or leaking hoses. Can it be a fuel pump problem? Need advice.

Nov 8, 2022 at 12:48 PM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,193 POSTS

Hi,

The code indicates a large EVAP leak. Usually, something is broken, disconnected, or rusted.

If you haven't already, check the fuel tank filler tube for rust holes. Also, have you had the fuel cap tested? It can be faulty.

I attached the evap system schematic below. (see pic 1 below) Check as many of the things you can. Also, make sure the PCV hose is not cracked or disconnected. (See pic 2 below.)

If you are unable to locate the leak, then it would be a good idea to have the EVAP system smoke tested. Smoke is injected at very low pressure into the EVAP system. If there is a leak, the smoke will come out at that point.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.

Images (Click to enlarge)

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Nov 8, 2022 at 8:38 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.