Code 446

1999 GMC SUBURBAN

160,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC

MICHAEL WAYNE COX

MEMBER
2 POSTS
FOLLOW

Intermittent start and stall. Sometimes get a little bit of chugging at acceleration. Need to know if it is purge valve. I don't think I'm having issues with the vent because no problems fueling. At a loss here.

May 14, 2019 at 9:04 AM

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.

SCGRANTURISMO

AUTOMOTIVE REPAIR CONTRIBUTOR
4,897 POSTS

Hello,

Direct Trouble Code*DTC) P0446 does indeed deal with the evaporative emission system (EVAP) of your vehicle. I have included for you in the diagrams down below a factory troubleshooting flowchart that will pin down the exact cause of this DTC for you. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

Images (Click to enlarge)

May 14, 2019 at 9:38 PM