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Problems and Service Talk about any mechanical problems you are having

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post #1 of 14 (permalink) Old 03-18-2012, 09:15 PM Thread Starter
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P0446

Got the code 2 month ago, I thought my fuel cap was only not well closed and cleared the code without doing anything. Came back 4-5 days ago. Cleared, then came back again 1 day ago.

So my question is: what can I do to get rid of this problem?

Car is: 2007 Cobalt LT no engine mod at all. No liquid/fuel leak, car run like new.

Thanks!


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Last edited by Masterz; 03-19-2012 at 07:56 PM.
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post #2 of 14 (permalink) Old 03-19-2012, 04:52 AM
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Check your purge solenoid, it is probably stuck open. Other possibility is your Evap Canister filter is pluged.

---------- Post added at 08:52 AM ---------- Previous post was at 07:40 AM ----------

DTC P0446: Evaporative Emission (EVAP) Vent System Performance


Circuit/System Description
This DTC tests the evaporative emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. With the purge valve open and the canister vent valve open, if the EVAP system vacuum goes above a calibrated threshold, then the test will fail.

FTP Sensor Signal Voltage
Fuel Tank Pressure

Low, Approximately 1.5 V or less
Positive Pressure

High, Approximately 1.5 V or more
Negative Pressure/Vacuum


Conditions for Running the DTC
• DTCs P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0220, P0222, P0223, P0443, P0449, P0452, P0453, P0502, P0503 are not set.

• The ignition voltage is between 11-18 volts.

• The barometric pressure (BARO) is more than 74 kPa.

• The fuel level is between 15-85 percent.

• The start-up engine coolant temperature (ECT) is less than 35°C (95°F).

• The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).

• The start-up ECT and IAT are within 8°C (14.4°F) of each other.

• The purge solenoid valve is enabled.

• DTC P0446 runs once per trip when the above conditions have been met.

Conditions for Setting the DTC
• The FTP sensor is more than 12 inches H2O vacuum for 2 seconds before the purge volume exceeds 10 liters.

OR

• The FTP is less than -2.5 inches H2O or more than +5 inches H2O for 60 seconds after a cold start.



• An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission System Cleaning .

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Last edited by Coby7; 03-19-2012 at 04:40 AM.
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post #3 of 14 (permalink) Old 03-19-2012, 11:11 AM
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Looking forward to an update, Masterz. If I can assist in any way (looking up warranty/recall information, helping you work with a dealership), please let me know in a private message (include the last 8 digits of your VIN).

Best,
Sarah
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post #4 of 14 (permalink) Old 03-19-2012, 01:26 PM Thread Starter
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Thanks a lot Coby, clear info, as always. One more question: where is that purge solenoid located? I looked at some video and it seems like an easy fix. Should I buy a brand new one or look at scrapyard for one?

Thanks Sarah, may I ask you how much a Purge Solenoid would cost me at a dealership?


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post #5 of 14 (permalink) Old 03-19-2012, 04:17 PM
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Maybe you only need to clean and lub it or maybe the contacts on it are starting to corrode. Investigate before you buy because some items cannot be returned. Also if you read at the very end it suggest that it might also be a dirty canister filter.

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post #6 of 14 (permalink) Old 03-19-2012, 04:22 PM Thread Starter
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Quote:
Originally Posted by Coby7 View Post
Maybe you only need to clean and lub it or maybe the contacts on it are starting to corrode. Investigate before you buy because some items cannot be returned. Also if you read at the very end it suggest that it might also be a dirty canister filter.
Ok. Well, where are those two things located on our car?


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post #7 of 14 (permalink) Old 03-19-2012, 04:34 PM
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Had to look it up for a precise location, sorry but I'm going as fast as I can. GM server is not the fastest you know.
I'll edit this post with canister placement. I know it is near the gas tank.
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Last edited by Coby7; 03-19-2012 at 04:40 PM.
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post #8 of 14 (permalink) Old 03-19-2012, 05:47 PM
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Have to give this Sarah credit. If the morons at the Chevy I deal with could be replaced with a few Sarah's I'd be more happy with the service.
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post #9 of 14 (permalink) Old 03-19-2012, 06:02 PM
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Bostonfan88, I think it would take a lot of Sarah's to please you. You would have the first Sarah reaching for a rope after 45 minutes.

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post #10 of 14 (permalink) Old 03-19-2012, 06:36 PM
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Quote:
Originally Posted by Coby7 View Post
Bostonfan88, I think it would take a lot of Sarah's to please you. You would have the first Sarah reaching for a rope after 45 minutes.
You couldn't be more wrong. I'm the guy that pays sticker price and tips for good service buys new equiptment not the cheapest. If you were to see the retards I'm dealing with you'd see differently.
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