Evap Code P0449

[bruce s]

I have a 2008 GMC Yukon SLT. I have had the evap solenoid replaced and a new gas cap installed. I am still getting the P0449 code. What else can I check? So tired of check engine light on and not being able to use the auto-start cause the check engine light is on. I tried clearing the code, but immediately comes back on.
Thanks for any suggestions....

 

[bruce s]

I am also smelling fuel on the outside of the vehicle towards the rear.

 

[HiHoeSilver]

Which solenoid did you do? There is one under the hood, and one by the tank. Charcoal canister could be bad, and pellets could be clogging the lines.

Have you looked underneath for any gas? Could have a hole in the tank/pump/lines, too, I suppose.

 

[bruce s]

Which solenoid did you do? There is one under the hood, and one by the tank. Charcoal canister could be bad, and pellets could be clogging the lines.

Have you looked underneath for any gas? Could have a hole in the tank/pump/lines, too, I suppose.

Which solenoid did you do? There is one under the hood, and one by the tank. Charcoal canister could be bad, and pellets could be clogging the lines.

Have you looked underneath for any gas? Could have a hole in the tank/pump/lines, too, I suppose.

Replaced the one at the tank. No fuel leaks on ground.

 

[Erickk120]

Simple answer, vent valve solenoid is malfunctioning, could be as simple as replacing it. I would do both vent and purge solenoids, if that doesn't fix it it will have to be looked at further, such as examining evap line and canister.

 

[zbad55]

Since you replace the canister vent solenoid, you may have a problem with the 5/8 vent line and also the canister. Since you are smelling fuel most like the line and canister.

 

[bruce s]

Since you replace the canister vent solenoid, you may have a problem with the 5/8 vent line and also the canister. Since you are smelling fuel most like the line and canister.

I'll look further into that, makes sense. Maybe there's a hole in the line or a bad connection.
Thanks

 

[Kraig]

Did you put an AC Delco part in there or something from autozone or equivalent?

 

[bruce s]

Did you put an AC Delco part in there or something from autozone or equivalent?

I believe they pit a autozone part in. The sucky part is that the guy who owned the business for decades had his cancer get worse and he had to close up and sell the shop so I can't go back to them.

 

[Erickk120]

The gas smell is likely a line or a bad canister, when my canister died I kept smelling gas after driving a while, and the tank would vent air if I opened the cap. Probably a clogged canister that would build pressure and it coudlnt vent it. I only do ac delco parts for little dumb things such as sensors and solenoid. I dont trust autozone sensors/solenoids.

 

[KATfishing]

Don't rule out a leaky fuel pump assembly. I went through all of the above to find out the gas smell was actually a seal and there was some gas on top of the tank that could only be seen with a scope by the shop. Changed that out and all codes went away, as did the gas smell. I've always heard, don't be quick to condemn the canister... usually it's something else. If it's vent valve (also replaced that), you will usually have trouble filling the tank (depending whether valve is stuck open or closed). With purge valve I had difficulty starting the vehicle right after filling up. And yes, a new AC Delco cap is also on my truck. Just don't rule out the fuel pump! It could be the culprit.

 

[rn1948]

I have a 2008 GMC Yukon SLT. I have had the evap solenoid replaced and a new gas cap installed. I am still getting the P0449 code. What else can I check? So tired of check engine light on and not being able to use the auto-start cause the check engine light is on. I tried clearing the code, but immediately comes back on.
Thanks for any suggestions....

I had the same issue on an 09 Tahoe. I replaced the gas cap and on-engine solenoid because they were quick and easy, no help. Turned out to be the charcoal canister and tubing by the gas tank. When I pulled the old one out, the tubing disintegrated. New tubing is not rubber and may hold up better. Hope this helps.

 

[bruce s]

I had the same issue on an 09 Tahoe. I replaced the gas cap and on-engine solenoid because they were quick and easy, no help. Turned out to be the charcoal canister and tubing by the gas tank. When I pulled the old one out, the tubing disintegrated. New tubing is not rubber and may hold up better. Hope this helps.

Thanks, I think it may end up being the charcoal filter because after pricing one of those bad boys out, I now know the mechanic just replaced the vent valve.

 

[bruce s]

Don't rule out a leaky fuel pump assembly. I went through all of the above to find out the gas smell was actually a seal and there was some gas on top of the tank that could only be seen with a scope by the shop. Changed that out and all codes went away, as did the gas smell. I've always heard, don't be quick to condemn the canister... usually it's something else. If it's vent valve (also replaced that), you will usually have trouble filling the tank (depending whether valve is stuck open or closed). With purge valve I had difficulty starting the vehicle right after filling up. And yes, a new AC Delco cap is also on my truck. Just don't rule out the fuel pump! It could be the culprit.

Thanks, I will remember that.

 

[HiHoeSilver]

Don't rule out a leaky fuel pump assembly. I went through all of the above to find out the gas smell was actually a seal and there was some gas on top of the tank that could only be seen with a scope by the shop. Changed that out and all codes went away, as did the gas smell. I've always heard, don't be quick to condemn the canister... usually it's something else. If it's vent valve (also replaced that), you will usually have trouble filling the tank (depending whether valve is stuck open or closed). With purge valve I had difficulty starting the vehicle right after filling up. And yes, a new AC Delco cap is also on my truck. Just don't rule out the fuel pump! It could be the culprit.

This is a good point. Mine rusted right through the lines on the head of the pump. I got long starts and could see fuel dripping down the passenger side of the tank. No codes or lights.

 

[TahoeLTZ2007]

My rusted vent line on top of the gas tank caused my evap code.Had to replace the fuel pump to fix it.Get it smoke tested to confirm a leak.It’s a inexpensive test, easier than taking down the tank .

 

[KATfishing]

My rusted vent line on top of the gas tank caused my evap code.Had to replace the fuel pump to fix it.Get it smoke tested to confirm a leak.It’s a inexpensive test, easier than taking down the tank .

This is probably the best point yet. It's so easy to throw a bunch of parts at it, and it really begins to add up. A smoke test would really be worth it, even if you do all the work yourself.