P0446

Tiny
DELPHN.C.
  • MEMBER
  • 2003 PONTIAC GRAND PRIX
  • 3.1L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 163,000 MILES
Replaced evap. Vent valve solenoid and ECM. And gas cap. Checked with a evap smoker. Still a problem. Question is, is there a Can bus module on this car.
Do you
have the same problem?
Yes
No
Wednesday, April 20th, 2016 AT 3:27 PM

9 Replies

Tiny
HMAC300
  • EXPERT
It's a blocked vent line someplace in system it needs to be smoke tested in order to fix this.
Was this
answer
helpful?
Yes
No
-1
Wednesday, April 20th, 2016 AT 3:38 PM
Tiny
DELPHN.C.
  • MEMBER
I have already smoke tested. Cleared the vent line. Pulled down gas tank to check all lines and conections. CheckEd evap filter. Made sure it was clear.
Was this
answer
helpful?
Yes
No
Wednesday, April 20th, 2016 AT 3:45 PM
Tiny
HMAC300
  • EXPERT
How about vent line to tank?Is the vent link kinked or pinched? Does solenoid operate
Was this
answer
helpful?
Yes
No
Wednesday, April 20th, 2016 AT 4:22 PM
Tiny
DELPHN.C.
  • MEMBER
Vent line to tank is open. Replaced solenoid and checked it.
Was this
answer
helpful?
Yes
No
Wednesday, April 20th, 2016 AT 4:25 PM
Tiny
HMAC300
  • EXPERT
From the factory the evap system is checked with 3 psi air pressure. Try applying that much and see if one of the hoses isn't opening and maybe soft and collapsing. Other than that I don't know what to tell you, especially since you smoke tested it and replace solenoid. Unless it's a connection or pcm problem which you can check with an ohm meter.
Was this
answer
helpful?
Yes
No
+1
Thursday, April 21st, 2016 AT 6:03 AM
Tiny
KEN
  • ADMIN
Here is an article with video to show you how to fix it

http://www.2carpros.com/articles/evap-system-code-repair

Let me know what you find

Was this
answer
helpful?
Yes
No
Thursday, April 21st, 2016 AT 6:55 PM
Tiny
ROBERT MANN
  • MEMBER
I had the same problem with a 2001 chev impala to fix it I had put a little form a gasket on the evap lines at the engine the small o ring inside evap line no good put form gasket on inside line with Q tip and on pipe now no more p0446 done to a couple of autos work good for all of them.
Was this
answer
helpful?
Yes
No
Tuesday, August 30th, 2016 AT 8:55 PM
Tiny
ROBERT MANN
  • MEMBER
THE O RING DOES NOT SEAL AS TIGHT AS NEW SO TRY FORM A GASKET TO SEAL THE EVAP LINES AT INTAKE SHOULD HELP FOR THAT CODE P0446
Was this
answer
helpful?
Yes
No
+1
Tuesday, August 30th, 2016 AT 9:00 PM
Tiny
KEN
  • ADMIN
You can try a new line or a larger is diameter O ring. The system must be air tight.
Was this
answer
helpful?
Yes
No
Wednesday, August 31st, 2016 AT 9:29 PM

Please login or register to post a reply.

Recommended Guides