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1999 Chevy Silverado service code P0446

Tiny
DUNATIC
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 151,000 MILES
I don't know what needs to be done to fix evaporative emission control system vent control circuit malfunction.
I also have a problem water leak that has the floor under divers feet soaked badly.
Sunday, January 10th, 2010 AT 2:30 PM

1 Reply

Tiny
JNOVACK
  • MECHANIC
  • 723 POSTS
A code P0446 could mean one or more of the following has happened:

Faulty vent valve
Open, short or excessive resistance on Vent valve control circuit
Blockage of vent valve
Bad PCM

Possible Solutions
With a P0446 OBD-II trouble code, here are some things to try:

Replace Vent valve
Repair open, short, or resistance problem in control circuit
Repair open, or short, or resistance problem in power circuit
Replace PCM
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Monday, January 11th, 2010 AT 12:04 PM

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