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2007 Chevy Colbalt 2.2 engine P0446 Code is on. what does it mean and how much does it cost to fix

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Code P0446 is related to your vehicles evaporative emissions system. Often this is caused by your gas cap not being properly tightened.

Before running out and spending money on this issue be sure the gas cap is in good condition and make sure it's tight. (At least 2 or 3 turns after it begins to click)

Drive the car for a few days. If the check engine light doesn't turn off you will need to go to a repair shop who can scan and troubleshoot the problem.

Good luck.

Posted on Jan 30, 2010

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Hi:
the code you got, p0446 is an evaporative emission fault. Often this code is tripped by a loose gas cap.
If this is the first time you got this code, have it cleared, make sure your gas cap is fitting snug, after it is clicked on, and drive the car normally and see if it comes back. If it comes back, you need to continue your troubleshooting of the emission control system.

Posted on Jan 30, 2010

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Posted on Jan 02, 2017

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What will fix codes po320 & po446?


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icon1.png Quick fix for code p0446 evap emissions vent circuit low.
As the title says: some might have an ses p0446, evap emissions vent circuit low. If you take it to the dealer they want 300-400.00 to fix the problem. GM has a service bulletin on this condition and have the updated part for 180.00, thats suppose to eliminate this issue.
Basically the problem is, the evap purge vent valve gets clogged with dirt, especially if the truck is used in dirty conditions. Well I figured there had to be a cheaper way to cure this problem.
Here it is:
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P0068, P0171, and P0446 and new ones down below


-I hate to say that but absolutely NO. If you don't know much about car. All these codes are emission code.
P0068 Mean Throttle position sensor.
P0171 Mean system too lean.
P0446 Mean evaporator emission control system has not correct flow
P0507 Mean Idle air control is too hight.
P0116 Mean engine coolant temperature.

Need to have a mechanic to check one by one to determine which part is effect before replace it.

Good luck

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Check engine code "P0446 Evap Control System Vent Control Circ"


Unfortunately, this code has nothing to do with the gas cap....
A code P0446 could mean one or more of the following has happened:
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  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
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Here are some things you could try to fix it:
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  • 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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