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2001 siverado 5.3 code P0446

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Feb 24, 2009, 2:48 PM

Post #1 of 6 (6732 views)
  post locked   2001 siverado 5.3 code P0446  

Need to know what causes this code to pop up on my 2001 chevy silverado 5.3 with 51300 miles on it I dont drive it over dirt roads on mud all of a sudden service engine soon came on, diagnosed and code P0446 showed on scanner.Can I be able to replace the part that is causing this trouble, I will appreciate any help only vehicle to drive to work and in need to fix before any other problem may occur thank you.


Feb 24, 2009, 3:06 PM

Post #2 of 6 (6728 views)
  post locked   Re: 2001 siverado 5.3 code P0446  

I'm not 100% on this, but i believe PO446 is EVAP vent solenoid performance. If you have access to a decent scanner or a gm tech 2, you will be able to control the solenoid through the special functions menu. If you don't have access to a scanner, you will need to complete the circuit by applying power or ground to the solenoid (again, not sure which. I use the scanner. A safe bet would be to disconnect the electrical connector and apply both power and ground) However you do it, you should listen for a click from the solenoid. They get jammed up quite often and have to be replaced. All this is based on P0446 being "EVAP vent solenoid performance" If I'm wrong on the code, this probably won't help. Best of luck.


Feb 26, 2009, 10:16 AM

Post #3 of 6 (6708 views)
  post locked   Re: 2001 siverado 5.3 code P0446  

I appreciate your input, I only connected the code reader and erased and reseted the code it's been 3 days and it hasn't come back on so I dont know if it reseted right or not but it is not coming back on so I think I'm good with that till now thanks again.Smile


Feb 14, 2013, 7:37 AM

Post #4 of 6 (4099 views)
  post locked   Re: 2001 siverado 5.3 code P0446  

Code keeps popping up i already replaced the evap canister and cleaned the part with the small filter but still the same what could it be.


Feb 14, 2013, 8:25 AM

Post #5 of 6 (4095 views)
  post locked   Re: 2001 siverado 5.3 code P0446  

Theres a tsb on 99-03 trucks about this problem, your supposed to change the vent solenoid, whivh is what the code is for in the first place, and then relocate the small filter you cleaned to on top of the tranny, but you need parts to perform thus that i know parts stores won't have . Take it to a dealer and they will most likely perform the bulletin

GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012

Hammer Time
Ultimate Carjunky / Moderator
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Feb 14, 2013, 10:26 AM

Post #6 of 6 (4088 views)
  post locked   Re: 2001 siverado 5.3 code P0446  

This thread is 4 years old. It's time to put it to bed and start a new one if there is a problem.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

(This post was edited by Hammer Time on Feb 14, 2013, 10:27 AM)

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