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Old 01-04-2012, 01:46 AM   #1
multimediaman
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Join Date: Sep 2007
Location: Texas
Vehicle:
2004 Impreza Outback
PacificaBluePrl+StlGryMet

Default Check Engine Light - Code P1443 Evap Control Solenoid

The code, P1443 - the symptoms ... none - until refueling.

The root cause - a breather valve for allowing smooth refueling failed, causing premature fuel-up cut-offs. This in turn lead me to overfill my tank (I didn't think I was at the time, but I'm sure I couldn't have estimated the exact amounts perfectly each time, plus a broken gas pump shut-off every now and then spilling fuel out the tank ...

Well, after a few months it seemed the breather valve wasn't nearly as much of an issue anymore ... either that or I got so used to topping off that I forgot about it ... but then after a while I started getting P1443 CEL codes - Autozone checked them out and gave me the information "Evap Control Solenoid"

It was running fine as far as I could tell, the light went away after a couple hundred miles, and I assumed that perhaps all this talk of loose gas caps was the problem ... so I made sure to keep the cap on tightly...

Eventually though, after refueling (even an almost-empty tank only up 5 gallons to below half-tank), the car would not want to start well, forcing me to give it gas in park/neutral in order to even run, otherwise it would stall right back down again.

I took it to the shop, and they took the system apart, analyzed the solenoids and valves, said that when they tested them, they activated properly... they also said that they seemed to be moving properly... though one seemed to stick a little bit. They replaced that, and the breather valve, and possibly a few other tidbits back there, and all seemed good.

However the check engine light keeps coming on every once in a while, and it's always P1443.

After some research, I'm lead to believe that the problem wasn't anything but that breather valve, and stems from me trying to workaround it. I've likely overfilled the tank, causing fuel to flood the charcoal canister, which is only supposed to receive fuel vapors. This is detrimental to the charcoal and the construction within the canister, and can cause charcoal pellets to brittle, break, crack, dislodge, and enter into parts that would be bad for charcoal pellets to exist. Namely into the vapor lines.

So what I'm thinking is there were charcoal fragments/pellets entering into the lines, and this would in turn disable some valve or solenoid from doing its job, hence the error code. Perhaps the varying size of the obstruction would explain why sometimes it's a code that lasts 70-miles, and sometimes it's a code that lasts 700 miles...

Anyway, driving along at about a little over half-tank, only difference is, I was on an extremely quiet road... able to hear just about everything the car was doing. I heard a little tiny clunk from the back end, right around the evap canister, solenoids, and valves, and lo and behold, check engine light. Now I'm even more confident that something dreadful has happened to my charcoal canister...


Long Story Short, I suspect that overfueling the tank has degraded my charcoal canister... and now the charcoal has crumbled, and is getting into the vapor lines.

So my questions are:

- is my logic concerning the charcoal canister decent or flawed? Do the symptoms match?

- is the charcoal canister something that's serviceable, say, opening it up, cleaning it out, putting new charcoal in? Or is it going to be something to replace altogether?

- I've seen both the plastic box (divided into two sections, one large, one narrow) that's readily visible, AND the metal capsule above it referred to as charcoal canisters ... I've seen youtube footage of charcoal pellets pouring out of the plastic box ... I've seen youtube footage of someone putting charcoal into parts that look like the metal capsule above the plastic box ... So which is actually the object containing the charcoal here? I've also seen part lists that list both items as charcoal canisters... -__-

- If it's the plastic box that needs servicing/replacing ... I've only seen one website that looks like they sell a new OEM spec one on a routine basis ... Does anyone happen to know a part number here so I could check suppliers I've actually heard of to find the part?

- Is there anything else I should know or check before considering to remove parts?
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Old 01-05-2012, 01:45 PM   #2
EJBurton88
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Default

P1443 - Vent Control Solenoid Valve Function Problem

No your logic is not off if you got liquid fuel into the canister you need to replace the canister its only supposed to have fuel vapor in it. Its hard to diag. over internet. No you cannot open it up you must go to dealership regarding EVAP related replacements doesnt mean you have to have them do it if you take it to an independant shop like the one i work at we'll get it from dealer, and replace as a unit. No i mean if you can do it your self go on ahead its not that hard. working on the ground just sucks. hope this is useful

Last edited by EJBurton88; 01-05-2012 at 01:57 PM.
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Old 01-05-2012, 05:06 PM   #3
multimediaman
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2004 Impreza Outback
PacificaBluePrl+StlGryMet

Default

Thanks for the reply ... I was hoping it was a serviceable part ... I have no real problem doing stuff to it myself, it's readily accessible to remove, almost had it off last night, but since it was ... night... I had to see by light, and I figured if there were going to be fuel vapors, and potentially fuel, using electric lights to see with is probably not a great idea.

I started unhooking the piping to it, and noticed the piping connectors, where it was almost completely off looked glossy, like fuel was *still* getting in there, despite me not filling over half a tank for about 2 weeks now.

Well, anyway, I guess I'm going to stop by the dealership and ask for a replacement charcoal canister... or at least a part number for one.

the part I'm concerned about is that it's telling me a solenoid has failed, so there's probably a pellet lodged up the tubing somewhere. That'll be fun to find.

I also noticed my differential seems to be seeping fluid. tack that onto the list of maintenance along with head gasket replacement, spring replacement, steering tune-up, and wheel balancing, new battery, parking light replacement, headlight alignment, and coolant flush and I have no shortage of work to do at all.

I hate to admit it, but at least dealerships do a lot of work. When you take on maintenance all on your own, covering all the bases can be tricky. I probably need a new thermostat and radiator cap now already too.

I would seriously hate to see a dealership bill for all that I've mentioned above lol
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Old 01-14-2012, 06:28 PM   #4
multimediaman
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2004 Impreza Outback
PacificaBluePrl+StlGryMet

Default

just an update : I finally got the canister replacement part in (about $100 from the dealer) and when I took the old one off, sure enough, tilt it a bit and out pours charcoal... this seems like it was the culprit... it also made noise when I moved it around a bit, almost as though you can hear loose bits in there.

I couldn't find evidence of it messing up the lines immediately around it, but I suppose if I get a CEL again I'm going to have to pull a lot more out from the evap system and clean/replace the tubing associated with it.

if I get a CEL again I'll probably be back with yet another update to this thread >.>
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Old 09-10-2012, 05:02 PM   #5
am1449
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ahh, crap. wrong part.

Last edited by am1449; 09-10-2012 at 05:11 PM.
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Old 09-22-2013, 05:33 PM   #6
scoon
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Default P1443 Question

Quote:
Originally Posted by am1449 View Post
ahh, crap. wrong part.
Hey there,

Sorry to bring up an old thread but I'm wondering if you got the correct part and did this resolve your issue?

Thanks,

Skip
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Old 10-08-2013, 07:47 PM   #7
pbw2004
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A possibly related issue. I got the code p1443 as well, my CEL went on when driving at highway speeds. I don't recall whether she was running rough when I pulled over or tried to restart, but I had her towed to my house until I figured out what the issue was. I was nervous about restarting the engine, since the last time I had an issue on the highway, it was a bent intake valve. Anyways, now I've checked the code, and tried to start her up, which was unsuccessful. The first time I think the engine tried to turn over, but after that, just some weird electrical noises, and eventually the battery went back down again. I might try to jump the battery again in the morning, but I figured I'd ask here if anyone else had any ideas.

Other things that may or may not be related: I recently refueled with premium (I've always used regular) based on a recommendation from a guy at the auto parts store, since I've been having some engine clicking noises (possibly the valve, I intend to have that checked out as well). I'm not planning on doing any work myself, but I figured I'd throw this out there in case anyone had any guesses about what is going on before I get in touch with a shop, especially since I'll have to have the car towed and have limited shop options here.

Oh, and the car is a 2004 Impreza Outback, with 110k miles. Thanks!
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Old 10-08-2013, 08:13 PM   #8
pbw2004
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Also, I just realized that my battery is about 6 years old. Any chance a bad battery could lead to this CEL code?
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Old 12-06-2013, 10:44 AM   #9
am1449
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Default I have no idea what I was thinking...

Quote:
Originally Posted by scoon View Post
Hey there,

Sorry to bring up an old thread but I'm wondering if you got the correct part and did this resolve your issue?

Thanks,

Skip
Not sure what was going on when I wrote that... maybe that I had replaced the solenoid and the slow gas tank fill and CEL of P1443 was fixed for a short period of time. I think what happened is that the carbon canister was damaged and was sending bits of charcoal into the solenoid and clogged the old one and the new one. Anyway, I replaced both the charcoal canister and the solenoid this fall--so far so good.

there's a great write up for this fix: http://cars.natemichals.com/subaru-2...ment-write-up/

The parts I used for a 2004 Subaru Impreza:
*solenoid valve: Manufacturer Part Number=911650, OEM Part Number=42084-FA120
*Carbon Canister: Manufacturer Part Number=W0133-1652537-OES
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Old 01-03-2014, 07:37 AM   #10
01Ts09Wrx
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2009 Wrx
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I am having the same issue today. Will make an update once the problem is resolved.
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Old 01-09-2014, 11:50 PM   #11
pokestar
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2004 Foz Xt
Mono Tone

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i just had the check engine light come on, on my 04 Foz xt and i checked it with my AP. If i take it to a dealer and have them change the solenoid, will they reflash my ecu to stock?
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Old 06-21-2014, 03:52 PM   #12
jimmy-moto
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Default

This exact same thing happened to my 2007 Impreza last week.
- I've noticed lately the engine often revs between 1000-2000 rpm instead of idling, this stops in 5-10 seconds.
- I filled up at the gas station and the car was very difficult to start and wouldnt stay running, eventually it went back to normal
- I got P0457 (Evaporative Emission Control System Leak Detected - Fuel Cap Loose/Off) code later that week. I checked the cap and it was tight.
- Today I got the P1443 code.

I don't ever overfill my fuel tank so I don't know how fuel would have got in there. Did replacing this part solve the problem??

Any information is helpful, thanks!
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Old 07-31-2014, 05:10 PM   #13
Darwin
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Blue Ridge Pearl

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I just got this, along with some hard starts after filling up at a Shell station I've never stopped at before.

Will update when I find a fix.
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