New gas cap fixes what?
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Senior Member
Joined: Feb 2011
Posts: 111
From: South Florida
New gas cap fixes what?
I recently had a P0449, which I fixed by replacing the vent solenoid back by the fuel tank. Then, about two weeks later, I started getting P0496. At first I thought it was the same code, but it's not, and now it looks like perhaps the purge solenoid? Seems like a related part of the evaporative emissions "circuit." That is also a pretty cheap part, only this time it seems like a bit more of a pain to fix (gotta take off the front wheel, fender liner, and then poke about in there I guess?). Some of the stuff I'm reading also says "Sometimes it's just a fuel cap." Well, that would certainly be easier. But I think it lists that as a possible fix for a lot of things.
For what it's worth, the error code was the only symptom I noticed for P0449 and the same for P0496. I'm not getting the hard-to-start-after-filling-tank thing at all, in case that's a hint.
Anyway...in the collective experience of this forum, has a bad gas cap really fixed this code very often? Or should I just bite the bullet and get that purge solenoid.
*Note: One video I saw had a test procedure for that solenoid, which was easy to do on that vehicle, since it was easily accessible. However on this one, if I'm removing all that stuff I'm just going to go ahead and replace it, regardless, most likely.
For what it's worth, the error code was the only symptom I noticed for P0449 and the same for P0496. I'm not getting the hard-to-start-after-filling-tank thing at all, in case that's a hint.
Anyway...in the collective experience of this forum, has a bad gas cap really fixed this code very often? Or should I just bite the bullet and get that purge solenoid.
*Note: One video I saw had a test procedure for that solenoid, which was easy to do on that vehicle, since it was easily accessible. However on this one, if I'm removing all that stuff I'm just going to go ahead and replace it, regardless, most likely.
Senior Member
Joined: Feb 2019
Posts: 115
When I got "P0449", I had hard to start after filling up.
Taking off Vapor Canister Purge Valve(2141680), It was stuck in open, it should close if no current is present. connected directly to battery and disconnected, it closed, put it back, worked for some time until I got error again.
Then I got new part and put it in, works fine since.
https://www.rockauto.com/en/moreinfo.php?pk=926315
Taking off Vapor Canister Purge Valve(2141680), It was stuck in open, it should close if no current is present. connected directly to battery and disconnected, it closed, put it back, worked for some time until I got error again.
Then I got new part and put it in, works fine since.
https://www.rockauto.com/en/moreinfo.php?pk=926315
Senior Member
Joined: Jul 2012
Posts: 8,999
From: C-Town
I recently had a P0449, which I fixed by replacing the vent solenoid back by the fuel tank. Then, about two weeks later, I started getting P0496. At first I thought it was the same code, but it's not, and now it looks like perhaps the purge solenoid? Seems like a related part of the evaporative emissions "circuit." That is also a pretty cheap part, only this time it seems like a bit more of a pain to fix (gotta take off the front wheel, fender liner, and then poke about in there I guess?). Some of the stuff I'm reading also says "Sometimes it's just a fuel cap." Well, that would certainly be easier. But I think it lists that as a possible fix for a lot of things.
For what it's worth, the error code was the only symptom I noticed for P0449 and the same for P0496. I'm not getting the hard-to-start-after-filling-tank thing at all, in case that's a hint.
Anyway...in the collective experience of this forum, has a bad gas cap really fixed this code very often? Or should I just bite the bullet and get that purge solenoid.
*Note: One video I saw had a test procedure for that solenoid, which was easy to do on that vehicle, since it was easily accessible. However on this one, if I'm removing all that stuff I'm just going to go ahead and replace it, regardless, most likely.
For what it's worth, the error code was the only symptom I noticed for P0449 and the same for P0496. I'm not getting the hard-to-start-after-filling-tank thing at all, in case that's a hint.
Anyway...in the collective experience of this forum, has a bad gas cap really fixed this code very often? Or should I just bite the bullet and get that purge solenoid.
*Note: One video I saw had a test procedure for that solenoid, which was easy to do on that vehicle, since it was easily accessible. However on this one, if I'm removing all that stuff I'm just going to go ahead and replace it, regardless, most likely.
Go back and check your repair!
The Evaporative Emission Control (EVAP) System seals the fuel system of the vehicle in order to prevent fuel vapors from the fuel tank and fuel system from escaping into the atmosphere. This is important because fuel vapors contain a variety of hydrocarbons. Hydrocarbons form smog when they react with air and sunlight. Gasoline evaporates very quickly, so if the fuel system is open to the atmosphere a vehicle can pollute 24 hours per day without even being turned on. These uncontrolled evaporative emissions account for as much as 20% of the pollution produced by a vehicle! When trouble code P0496 is set, it means that there is an issue with the purge flow in the EVAP system. Specifically, the Evaporative system is purging fuel vapors when it shouldn’t be.
What Is The Cause Of P0496?
- Leaking EVAP system hose
- Poor electrical connection
- Leaking Charcoal Canister
Causes of Code P0449
- Leaking EVAP system hose
- Poor electrical connection
- Leaking Charcoal canister
Last edited by hummerz; Dec 25, 2019 at 06:33 PM.
Senior Member
Joined: Jul 2012
Posts: 8,999
From: C-Town
When I got "P0449", I had hard to start after filling up.
Taking off Vapor Canister Purge Valve(2141680), It was stuck in open, it should close if no current is present. connected directly to battery and disconnected, it closed, put it back, worked for some time until I got error again.
Then I got new part and put it in, works fine since.
https://www.rockauto.com/en/moreinfo.php?pk=926315
Taking off Vapor Canister Purge Valve(2141680), It was stuck in open, it should close if no current is present. connected directly to battery and disconnected, it closed, put it back, worked for some time until I got error again.
Then I got new part and put it in, works fine since.
https://www.rockauto.com/en/moreinfo.php?pk=926315
Thread Starter
|
Senior Member
Joined: Feb 2011
Posts: 111
From: South Florida
Hmmm...weird. that the P0496 correction doesn't list that purge solenoid. There are several other resources I found that do list it as a possibility.
For what it's worth, I did go back and double-check my P0449 repair when I initially thought it was the same code popping up again. Everything seems fine, although it "seemed fine" before, it just seems the solenoid was bad.
For what it's worth, I did go back and double-check my P0449 repair when I initially thought it was the same code popping up again. Everything seems fine, although it "seemed fine" before, it just seems the solenoid was bad.
Yes, vent solenoid could have been the correction for p0449, now you need to:
Go back and check your repair!
The Evaporative Emission Control (EVAP) System seals the fuel system of the vehicle in order to prevent fuel vapors from the fuel tank and fuel system from escaping into the atmosphere. This is important because fuel vapors contain a variety of hydrocarbons. Hydrocarbons form smog when they react with air and sunlight. Gasoline evaporates very quickly, so if the fuel system is open to the atmosphere a vehicle can pollute 24 hours per day without even being turned on. These uncontrolled evaporative emissions account for as much as 20% of the pollution produced by a vehicle! When trouble code P0496 is set, it means that there is an issue with the purge flow in the EVAP system. Specifically, the Evaporative system is purging fuel vapors when it shouldn’t be.
Go back and check your repair!
The Evaporative Emission Control (EVAP) System seals the fuel system of the vehicle in order to prevent fuel vapors from the fuel tank and fuel system from escaping into the atmosphere. This is important because fuel vapors contain a variety of hydrocarbons. Hydrocarbons form smog when they react with air and sunlight. Gasoline evaporates very quickly, so if the fuel system is open to the atmosphere a vehicle can pollute 24 hours per day without even being turned on. These uncontrolled evaporative emissions account for as much as 20% of the pollution produced by a vehicle! When trouble code P0496 is set, it means that there is an issue with the purge flow in the EVAP system. Specifically, the Evaporative system is purging fuel vapors when it shouldn’t be.
What Is The Cause Of P0496?
- Leaking EVAP system hose
- Poor electrical connection
- Leaking Charcoal Canister
Causes of Code P0449
- Leaking EVAP system hose
- Poor electrical connection
- Leaking Charcoal canister
Senior Member
Joined: Jul 2012
Posts: 8,999
From: C-Town
Hmmm...weird. that the P0496 correction doesn't list that purge solenoid. There are several other resources I found that do list it as a possibility.
For what it's worth, I did go back and double-check my P0449 repair when I initially thought it was the same code popping up again. Everything seems fine, although it "seemed fine" before, it just seems the solenoid was bad.
For what it's worth, I did go back and double-check my P0449 repair when I initially thought it was the same code popping up again. Everything seems fine, although it "seemed fine" before, it just seems the solenoid was bad.
Thread Starter
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Senior Member
Joined: Feb 2011
Posts: 111
From: South Florida
If I didn't fix anything, why did the P0449 code go away (the P0496 code didn't appear until several days later, but I can't swear that was the first time it showed up)?
If it is a common electrical problem, do you have any additional info about where that typically occurs? Between the two solenoids there is the entire body of the truck.
If it is a common electrical problem, do you have any additional info about where that typically occurs? Between the two solenoids there is the entire body of the truck.
Thread Starter
|
Senior Member
Joined: Feb 2011
Posts: 111
From: South Florida
OK, just to (fingers crossed) put a bow on this one, I replaced the vapor canister purge valve with the AC Delco part
I know I previously said I had not noticed the issue with hard starting after filling with gas, but the last couple times I filled up it did seem to crank for a while. I've also had two random no-starts that were fine after waiting a few hours...not sure that that is related but I'm hoping. Anyway, I decided to go ahead and give it a shot, and it seems to have worked. At least, the error code, which was pretty much immediate after starting the vehicle, has not returned after two drives. This required removing the driver's side wheel and fender liner, and then working through a tangle of wires, lines, etc to get at the part.
I was going to replace the crank position sensor while I was in there (it also requires pulling the wheel and fender liner) due to my ongoing P0017 issue (I know it's not likely to fix it but it's in the chain and I've already replaced the cam position sensor, so why not) but then read that I would need to some sort of relearn function which my scanner doesn't seem to support. So screw that, I'm not going through that for something I don't think is likely to actually fix anything.
I was going to replace the crank position sensor while I was in there (it also requires pulling the wheel and fender liner) due to my ongoing P0017 issue (I know it's not likely to fix it but it's in the chain and I've already replaced the cam position sensor, so why not) but then read that I would need to some sort of relearn function which my scanner doesn't seem to support. So screw that, I'm not going through that for something I don't think is likely to actually fix anything.
