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Code P0446 system vent control circuit?

Tiny
DEQUESO
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 2.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 83,000 MILES
I have replaced the purge valve, also canister vent valve and gas cap. Drive 90 miles same code returns I clear code drive around 70 miles code returns etc, etc. I have checked the electrical connections all good.
Wednesday, September 20th, 2023 AT 2:33 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Here is the definition of the code and this problem occurs when the EVAP purge solenoid goes out.

P0446 - Evaporative Emission Control System Vent Control Circuit Malfunction

Here is the location of the EVAP purge solenoid #13. Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Thursday, September 21st, 2023 AT 2:07 PM
Tiny
DEQUESO
  • MEMBER
  • 38 POSTS
I have replaced that solenoid plus canister vent valve also gas cap, have checked the electrical on the solenoid and wire conn all good. If I have a leak, why would it be so erratic? Plus, what does it hurt if it leaks?
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Saturday, September 23rd, 2023 AT 9:06 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
This is a circuit code which means the valve is bad, the wiring or the PCM. It does really hurt anything except for having the check engine light on.
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Sunday, September 24th, 2023 AT 10:04 AM

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