Engine light 2003 H2 Help... (Full Version)

Hummer >> Hummer Forums - General >> General Hummer Talk

Engine light 2003 H2 Help...

  

flrtrader -> Engine light 2003 H2 Help... (2/5/2008 4:28:34 PM)

Hi,

New to the forum and am having a problem I can't seem to tackle. Engine light came on a few weeks ago and I took it into Autozone to have the code read, Which was PO455

At the time they said it looked like a gas cap issue and mine was not tightning as it sould so I replaced it, they reset the light and said here's hopping it stays off! Well I was happy cause it stayed of for almost a week, BUT today she popped back on,... I stopped back by to get another code read and was told it was the same code, but now with the cap replaced it was saying a large leak in the evap system which could be evap can broke, hose cracked or fell off, or purge or vent selinoid defective, or... vacum leak at engine.  I feel stupid but I have no idea where the Evap canister is, and could find nothing pointing me at it.  I don't think its a Vac leak at the engine cause the motor runs perfect, not a miss... not a sputter...  So... if any one of you really kind people can help with the code,   first place you'd look ect.    Actually a pic of the evac canister might help....  [:(]

Thanks in advance....

  
Muddydawg75 -> RE: Engine light 2003 H2 Help... (2/5/2008 4:43:56 PM)

I had the vent solenoid replaced for p0446 and also the cannister for p0446...

I think p0445 is for the relief valve on the top of your gas tank...


blackstangs281 -> RE: Engine light 2003 H2 Help... (2/5/2008 6:30:13 PM)

The canister is located on the drivers side frame, about mid vehicle.


blackstangs281 -> RE: Engine light 2003 H2 Help... (2/5/2008 6:36:58 PM)

The 455 code is a large leak in the system. If it is not the cap, then a line or hose has to be off or cracked. Or it could be a purge valve stuck open.

The H2 runs a check in between 1/4 and 3/4 tank of gas. That may explain why the light did not come back on right away. If you keep your tank full or above 3/4 it will not tag the light. As soon as it drops below that, it runs a check on the system.

Check all the vent lines to make sure one has not come off.

pteam -> RE: Engine light 2003 H2 Help... (2/5/2008 7:26:46 PM)

Good info here.

flrtrader -> RE: Engine light 2003 H2 Help... (2/6/2008 12:14:07 PM)

Thanks Blackstang,

I located the canister and crawed all around it...  the can looked like new... none of the three hoses off or loose One large and two smaller.  I evenlistened cause you'd think with a magor leak one would hear the sucking sound?  But nope...  crawled all over the engine...  could find not obvious leaks, cracks... ect.  Im stumpted cause Im not a silly, stupid man in my prime I even built a few racing engines.. so this is actually rediculas!  GRrrr.. Besides the 100 dollar bill my hummer dealer wants just to run a diagnostic! They are like 60 miles away.. Im in construction and we work daylight till dark so I'll need to rent a car, just to drop my beast off...  I mean she's worth every dime but dang it just seems....  

Muddydawg75 -> RE: Engine light 2003 H2 Help... (2/6/2008 2:42:28 PM)

so... while you were under there did you check the relief valve on the tank?

Significant -> RE: Engine light 2003 H2 Help... (2/6/2008 9:59:21 PM)

this should help you out on solving your problem... http://service.gm.com/servlets/BlobShtml?ShtmlFile=1251046&psdid=732&evc=sm

ebrown -> RE: Engine light 2003 H2 Help... (2/7/2008 6:04:40 AM)

that link doesnt work for me.....

3hummers -> RE: Engine light 2003 H2 Help... (2/7/2008 7:47:27 AM)

I couldn't get the link to work either.

Significant -> RE: Engine light 2003 H2 Help... (2/7/2008 4:40:18 PM)

sorry it might only be accessable for technicians... ill try to get something up for you...

  

Page: [1]

Return to Hummer Forums home page or view the Full Version of this page.