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#12470327 - 10/18/17 02:31 PM Check engine code p0446
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
Any Chevy mechanics here? Wife's 06 hhr throwing a p0446. Something about the evaporate vapor system.. I replaced the evap solenoid cleared the code,, light is back.. Any ideas?

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#12471089 - 10/19/17 09:15 AM Re: Check engine code p0446 [Re: boocat]
TXMako2201 Offline
Outdoorsman

Registered: 10/26/16
Posts: 70
did you replace the evap canister? If so, did you replace the filter also? both should be done at the same time.

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#12471913 - 10/19/17 08:15 PM Re: Check engine code p0446 [Re: boocat]
Couples Team Online   content
Angler

Registered: 05/02/13
Posts: 268
Loc: Lindale
Probably need to check the fuel tank pressure sensor... Like above said.. The canister may need to be replaced... Which solenoid did you replace?

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#12472211 - 10/20/17 05:10 AM Re: Check engine code p0446 [Re: boocat]
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
i replaced the one under the hood.

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#12472329 - 10/20/17 07:50 AM Re: Check engine code p0446 [Re: boocat]
spankyttx Offline
Extreme Angler

Registered: 01/22/09
Posts: 1071
Loc: Denton Tx.
under the hood? i thought all this vapor can stuff was under the vehicle behind the rear drag axle, i could be wrong but that solenoid and pressure sensor should be with or around the vapor canister, have you checked or replaced the fuel cap?
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#12472471 - 10/20/17 09:22 AM Re: Check engine code p0446 [Re: boocat]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6864
Loc: texas
Been a few years since I replaced it, but there is one on top of the motor also. I replaced it on my mom's Tahoe when I put a new oil pressure sensor in, it cured the check engine light for a while, but it has since reared its head again and suspect one of the other parts of the system.

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#12472489 - 10/20/17 09:37 AM Re: Check engine code p0446 [Re: boocat]
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
Will take a closer look at the gas cap.. Yes,, the one under the hood.. Will try and get under that little car to check the other.. If I can't work under there, its off to the dealer with some ky.

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#12473046 - 10/20/17 04:13 PM Re: Check engine code p0446 [Re: boocat]
Todd™ Online   content
TFF Team Angler

Registered: 01/21/11
Posts: 3504
Loc: On my kayak
Purge valve is under the hood and vent valve is by the canister. I would not be surprised if it's the fuel tank pressure sensor as stated. Tank has to be dropped for that.
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#12475284 - 10/22/17 09:00 PM Re: Check engine code p0446 [Re: boocat]
patriot07 Offline
TFF Guru

Registered: 04/20/10
Posts: 18484
Loc: chateau d'if
Did you try cleaning the throttle body? Does it run good?
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Life can only be understood backwards; but it must be lived forwards.
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#12475539 - 10/23/17 08:12 AM Re: Check engine code p0446 [Re: boocat]
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
runs perfect

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#12475669 - 10/23/17 09:48 AM Re: Check engine code p0446 [Re: boocat]
spankyttx Offline
Extreme Angler

Registered: 01/22/09
Posts: 1071
Loc: Denton Tx.
how's your progress on this boocat?
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#12475772 - 10/23/17 11:05 AM Re: Check engine code p0446 [Re: boocat]
Todd™ Online   content
TFF Team Angler

Registered: 01/21/11
Posts: 3504
Loc: On my kayak
For a little info this code is related to a test for a blocked or restricted vent of the EVAP system. During the test the purge valve (underhood) is opened and the vent valve (by canister) is closed. This allows vacuum to be applied to the fuel tank. The ECM then closes the purge valve and opens the vent valve to watch for a vacuum drop in the tank via the fuel tank pressure sensor. If it does not go to 0 in a predetermined amount of time code p0446 will set.

You've got a possibility of a clogged canister, clogged vent tube, bad vent valve stuck shut, or bad fuel pressure sensor. More times than a clogged system or bad valve we see bad fuel tank pressure sensors. Bad thing for you is we use "THE SUPER DUPER CAR FIXING COMPUTER" to apply vacuum, command the valves for testing, and monitor the fuel pressure sensor data to determine what has failed.

If you still would like to guess before having to take it to a shop don't waste time on throttle bodies and gas caps for code p0446. You've got a clogged system, bad vent valve, or bad pressure sensor.
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#12475941 - 10/23/17 01:08 PM Re: Check engine code p0446 [Re: boocat]
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
yeah, I think its off to dealer. She wants to sell it anyway..06 hhr lt with 14,000. miles... She don't drive much.

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#12477516 - 10/24/17 05:45 PM Re: Check engine code p0446 [Re: boocat]
boocat Offline
Pro Angler

Registered: 07/30/12
Posts: 990
Loc: Hill Country
yep, tank pressure sensor, $550.

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#12478148 - 10/25/17 08:45 AM Re: Check engine code p0446 [Re: boocat]
Todd™ Online   content
TFF Team Angler

Registered: 01/21/11
Posts: 3504
Loc: On my kayak
That's about right on price. Every shop has different labor rates per hour. Might be a tad high so I hope you gave it to them with a full tank so they had to work for it.
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