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I have a '08 Outlook XE with ~85K. Have a steady DTC P0449, won't reset. Also, whenever I remove the gas cap to fill up, I have trouble starting afterwards. From other sites it sounds like I should try a new gas cap and then replace the vent valve solenoid. Anyone have a diagram of where I find that sucker, and perhaps a part number?
 

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I would change the solenoid like rbarrios has linked a previous discussion of the same problem.

Changing the gas cap is probable a waste of money and won't solve the problem.
 

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Thanks for the replies, but the p0446 indicates the purge valve, not the vent valve. As far as I've been able to determine, they are two separate items in the EVAP system.
 

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Are there any views or pictures of this available. My wifes '07 Outlook XR threw this code and I am trying to fix it without paying an arm and a leg for Dealer repair.
 

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I have a 2008 Outlook XR with approx. 80,000 miles on it. The check engine light came on and I had it scanned at an automotive parts supplier. The code was P0449. With many hours looking up this issue on the internet, there seemed to be an issue on what and where the issue was. There are basically (3) areas to check:

The PURGE solenoid, which is on the intake manifold (which I replaced and check engine light still on). There was a post on this with the fix.

The GAS CAP. GM bad design (which I replaced and check engine light still on).

The VENT solenoid, which is on top of the gas tank near charcoal canister (next repair)

After checking the internet, I finally called the dealer and he agreed to give me the correct part number.

The part number is ACDelco 20907779 ACDELCO OE SERVICE HOSE ASM-EVAP EMIS. I found it the cheapest on Amazon for 73.51 not the 178.42 from the dealer. You will also need ACDelco 19257603 Evaporative Emission Canister Valve Solenoid Jumper Wiring Harness Assembly - 15.65.

The trick now is to drop the tank and access it. Hopefully this is the cure.
 

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if im not mistaken-- the evap emissions test is NOT run at every engine start-- so the light wont be turned off
It runs only on every X engine starts.

Youd probably be better off clearing the CEL-- and then driving for a while to see if the light comes back on
 

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Thanks. I will clear the CEL tonight.

I found a link on how to do this.

Unhook battery, turn lights for more that 5 minutes or honk horn until dead. Reattach battery and it should be cleared.

I will let you know. Thanks again.
 

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or go to the auto parts place- have them clear the code..

or buy one of the code readers for $80 and clear it yourself.
 

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Well after changing the purge solonoid on intake, the gas cap, and just had a mechanic drop the tank and change out vent soloniod the code was cleared! Resetting or clearing the CEL did not work, the check engine came right back on.

Well all said and done, driving home my check engine light came with service stabilitrack and traction control off going on and off. Are you serious! Took back to get scanned with a GMTechII scanner. I had another code come up, don't have it right now but will post. Mechanic said I have a head gasket leak and my MAF (mass air flow sensor) gummed up! He gave me the option of replacing head gasket - 1,800.00 or get a new engine! Are you serious with this truck? I had them change the MAF and clean the system out. Drove the truck for over a 100 miles and had the truck scanned again. No codes were present.

I am at wits end with this vehicle. Has anyone heard of replacing the engine as a fix or is this guy nuts?
 

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After replacing the purge solenoid, vent solenoid and gas cap on my 2008 Outlook XR, I found a corroded wire going to the vent solenoid on the gas tank. The connector to the gas tank is underneath the car's driver side between the front and rear doors. The two wires going to the vent are red/with white stripe and white. The white wire was corroded and broke off. After a quick splice job, check engine light reset!! I recommend anyone replacing the vent solenoid to check the wire before putting the gas tank back in place. Hope this helps anyone trying to do the same fix.
 

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talking about this connector?

Inoperative Fuel Gauge and Hard Start/No Start Condition
June 18, 2012
Some 2008-2012 Enclave, 2009-2012 Traverse, 2007-2012 Acadia and 2007-2010 Outlook models may exhibit one or more of the following conditions:

• Engine is hard to start • Engine will not start • Engine starts, then stalls • Fuel gauge is inoperative or fluctuates • Service Engine Soon/Check Engine light is illuminated



These conditions, which may be intermittent and have various DTCs set, may be due to the fuel tank harness to body harness retainer slipping on the tubing, putting pressure on the harness and causing connector X305 to become partially separated or not fully seated. (Fig. 13)






Inspect connector X305 to make sure that it is fully seated. If the connector is not fully seated, inspect the terminals at connector X305 for corrosion. If the terminals show signs of corrosion, replace the corroded terminals.



Remove the wire harness retaining clip from the steel lines (Fig. 14, Position 1) and reposition it in front of the steel line support to prevent it from sliding. (Fig. 14. Position 2)


 

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Check engine light came on.. So, I replace Canister Purge Solenoid.... Light is still on.. The Code still comes up.. Look under the car wires looks fine.. Any help.. Would something like this be under warranty????
 

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lshibles said:
Check engine light came on.. So, I replace Canister Purge Solenoid.... Light is still on.. The Code still comes up.. Look under the car wires looks fine.. Any help.. Would something like this be under warranty????
Can't answer warranty questions without answers to these. What year is your Outlook and how many miles are on it. Are you original owner or second owner.
 

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2008 outlook with 78,000.. I'm the second owner..

I have not replace my gas cap.. Should I??? Or it's just a waste of money????
 

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lshibles said:
Check engine light came on.. So, I replace Canister Purge Solenoid.... Light is still on.. The Code still comes up.. Look under the car wires looks fine.. Any help.. Would something like this be under warranty????
so you know its the P0449 code? (as in youre reading the code via the OBD port?)
 
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