Evap Vent Solenoid Error Code P0449
Evap Vent Solenoid Error Code P0449
my 2000 sle is throwing this code here recently.
to explain my situation, we have had alot of rain here lately, and my wife has been driving bonnie since she wrecked her car week ago or so...well, there is a area on our road with standing water from rain flooding, it was deeper then she realized...and it got some water into the intake track. i replaced the air filter since it was damp and cleaned up the TB and MAF and IAC...the ribs of the air intake bellow had small amount of water in them...so she sucked up some water....
anyway, did all this and drained oil to be safe and replaced. did pull 1/3/5 spark plugs and no signs of water in cylinders...so i think it didn't get to far.
well, after all this...car ran great then it threw the SES light other night....seems to be running fine still...but it throws the P0449 code. i climbed under and took the rear vent valve out and checked it for dirt or anything..looked fine...cleaned it and put back in..threw light again today. could this code point to the solenoid under the hood as well??
either are fairly inexpensive...but would like to narrow it down....
to explain my situation, we have had alot of rain here lately, and my wife has been driving bonnie since she wrecked her car week ago or so...well, there is a area on our road with standing water from rain flooding, it was deeper then she realized...and it got some water into the intake track. i replaced the air filter since it was damp and cleaned up the TB and MAF and IAC...the ribs of the air intake bellow had small amount of water in them...so she sucked up some water....
anyway, did all this and drained oil to be safe and replaced. did pull 1/3/5 spark plugs and no signs of water in cylinders...so i think it didn't get to far.
well, after all this...car ran great then it threw the SES light other night....seems to be running fine still...but it throws the P0449 code. i climbed under and took the rear vent valve out and checked it for dirt or anything..looked fine...cleaned it and put back in..threw light again today. could this code point to the solenoid under the hood as well??
either are fairly inexpensive...but would like to narrow it down....
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
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Re: Evap Vent Solenoid Error Code P0449
I'd bet that the valve got wet and short circuited.
Bye Bye:

RIP sandrock

RIP sandrock
Sirius wrote:Think about it. You’re tooling down the road in your Prius, knowing full-well that this thing being green is as big a sham as federally mandated ethanol-enriched gas, Russia pulling out of Ukraine, and Obamacare.
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Re: Evap Vent Solenoid Error Code P0449
When that code appears, it indicates a problem in the electrical circuit for the valve, or the valve itself. If there is no damage to the wiring, and the connector is good, the problem is likely the vent valve. The cannister purge valve under the hood will throw a different code.
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
Re: Evap Vent Solenoid Error Code P0449
thanks for the quick replies, i will get the valve under the rear of the car then.. it only threw this code after the water issue, so i was thinking it would be the rear under the car just due to being under water most likely.
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
Re: Evap Vent Solenoid Error Code P0449
I bought a new vent valve for under the car on drivers side. GM part. Still throwing the same code P0449.....
whats next to check/replace?
whats next to check/replace?
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
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00Beast
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Re: Evap Vent Solenoid Error Code P0449
Check and make sure the gas cap is sealing, and make sure there's no rust. If there is, clean it off, and clear the code again.
Bye Bye:

RIP sandrock

RIP sandrock
Sirius wrote:Think about it. You’re tooling down the road in your Prius, knowing full-well that this thing being green is as big a sham as federally mandated ethanol-enriched gas, Russia pulling out of Ukraine, and Obamacare.
Re: Evap Vent Solenoid Error Code P0449
i can check, but this still all stems from when the wife got the car a bit wet driving.........
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
- Archon
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- Posts: 8781
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Re: Evap Vent Solenoid Error Code P0449
Did you clear the code after putting on the valve? Check all along the wiring harness leading to the valve to see if you can find any damage or bad connections. When you worked in the air box, did you disconnect any of the connectors to the PCM?
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
Re: Evap Vent Solenoid Error Code P0449
Yes, i have cleared the codes a few times now with my scanner to be sure. It didn't come on this morning when i drove to work..but it usually comes back on at some point.
i did have the air box apart and had the pcm moved out of my way while putting it back together, maybe i caught a wire or something, i will check that next.
Is there anything else in this circuit for the code that would need to be replaced?
Thanks
i did have the air box apart and had the pcm moved out of my way while putting it back together, maybe i caught a wire or something, i will check that next.
Is there anything else in this circuit for the code that would need to be replaced?
Thanks
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
- Archon
- Resident Gearhead

- Posts: 8781
- Joined: Mon May 19, 2008 10:30 pm
- Year and Trim: 2014 Cadillac XTS Vsport.
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Re: Evap Vent Solenoid Error Code P0449
That code shows an electrical problem, rather than a vacuum problem, so there isn't a lot to it. Does your scanner have the ability to activate that valve? If so, you could check for voltages with a test lamp. I'll have to check to tell you which connection to check on the PCM which could save you some time.
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
Re: Evap Vent Solenoid Error Code P0449
Sorry, no it does not. Just your basic OBD-II scanner for checking/clearing codes.
Any help is appreciated!
Any help is appreciated!
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
- Archon
- Resident Gearhead

- Posts: 8781
- Joined: Mon May 19, 2008 10:30 pm
- Year and Trim: 2014 Cadillac XTS Vsport.
- Location: Grand Rapids, Michigan
Re: Evap Vent Solenoid Error Code P0449
Pin #2 on the white connector of the PCM is for the cannister vent valve. I'll send you a diagram via PM.
*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.
Re: Evap Vent Solenoid Error Code P0449
thanks for the info...i will check it out next.
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
Re: Evap Vent Solenoid Error Code P0449
Still no go. i was getting the tried and true "check gas cap" message couple days ago too.....cleaned up the gas fill neck and hadnt seen that message back yet...but SES light is on again with same P0449 code. guess my next thing is take to dealer to let them cycle the new solenoid...maybe i got a bad one...
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
Re: Evap Vent Solenoid Error Code P0449
i still don't have this resolved.
since all this, i have bought a new purge valve for up front on the motor and a new gas cap as well as cleaned the filler neck of anything possible being on it.
car still throws the PO449 code and comes up with "check gas cap" message.
i am hoping i just got a bad vent valve when i put the new one on.... i ordered another one from dealer...should have tomorrow.
also, i did check the pcm connections. i didn't snag anything on it. so, i don't see that being the problem.
what can i check for at the connector out back to the vent valve? voltage and when does it get applied to this circuit?
i got this car sold and i really want it fixed before it goes...any help appreciated.
since all this, i have bought a new purge valve for up front on the motor and a new gas cap as well as cleaned the filler neck of anything possible being on it.
car still throws the PO449 code and comes up with "check gas cap" message.
i am hoping i just got a bad vent valve when i put the new one on.... i ordered another one from dealer...should have tomorrow.
also, i did check the pcm connections. i didn't snag anything on it. so, i don't see that being the problem.
what can i check for at the connector out back to the vent valve? voltage and when does it get applied to this circuit?
i got this car sold and i really want it fixed before it goes...any help appreciated.
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
Re: Evap Vent Solenoid Error Code P0449
last night was taking volt readings from the connector to the vent valve and while rotating the connector, the white wire broke loose of the connector..... not enough wire to resplace/solder. looks like the connection through that wire may have been comprimesed not allowing a ground for the valve. ordered a new connector...we will see if this fixes it!
"You cannot legislate the poor into freedom by legislating the wealthy out of freedom.
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~
What one person receives without working for, another person must work for without receiving.
The government cannot give to anybody anything that the government does not first take from somebody else.
When half of the people get the idea that they do not have to work because the other half is going to take care of them,
and when the other half gets the idea that it does no good to work because somebody else is going to get what they work for,
that my dear friend, is about the end of any nation.
You cannot multiply wealth by dividing it."
~~~~~ Dr. Adrian Rogers, 1931 - 2005 ~~~~~


