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Transmission/ Code P0449

 
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Connersdad19
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PostPosted: Wed Apr 07, 2010 6:37 pm    Post subject:  Transmission/ Code P0449 Reply with quote

Hopefully i can explain this enough for you guys on this forum...but my wifes 2003 impala for the past two months has acted funny about 2-3 times within those months when it comes to shifting....it seems like its missing its shifting points and revs up high and then it will shift...as stated it does not do it all the time....it has only done it a few...i went to the local autoparts store to have them see what the check engine light was on for and it came back with the code being P0449 which is having to do with the EVAP solenoid......would this evap be making the car shift weird? the only other thing that i could think it would be is the transmission going out....please help as i dont have a lot of money and i am just lost at the moment....thanks...

This is what the code says

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Definition:
EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

Explanation:
The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connevtor and wiring
3- Fuel saturated vapor canister
4- Failed EVAP vent solenoid

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bigdog60
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PostPosted: Wed Apr 07, 2010 8:14 pm    Post subject:   Reply with quote

I have replaced the EVAP vent solenoid twice on my car. But it has never affected the way the transmission shifted.If that any help to ya.
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Connersdad19
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PostPosted: Thu Apr 08, 2010 12:19 am    Post subject:   Reply with quote

thanks for the reply...either way i am going to have to get the evap fixed....how much did that run you>? did you do it yourself or a garage? how much for the part itself...my local autozone said they did not have it...thanks again.

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bigdog60
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PostPosted: Thu Apr 08, 2010 7:40 pm    Post subject:   Reply with quote

Connersdad19 wrote:
thanks for the reply...either way i am going to have to get the evap fixed....how much did that run you>? did you do it yourself or a garage? how much for the part itself...my local autozone said they did not have it...thanks again.

There are two valves,but the one in the back, fails the most, it is behind the back tire on the drivers side near the gas fill pipe.

One 10mm bolt holds it on.
I think it was around $40
GM# 25932569
ACD# 214-2147 Just to add, my car is an 05 but I think they are all the same.
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Connersdad19
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PostPosted: Fri Apr 09, 2010 12:07 am    Post subject:   Reply with quote

ok thanks a lot.

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Connersdad19
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PostPosted: Sat Apr 17, 2010 1:53 am    Post subject:   Reply with quote

well i changed the part you gave me the number for...it didnt work...while under there i noticed that the hose was cracked so i am going to replace it tomorrow and see if it helps...


does anyone know why it would be shifting weird? like a relay or something...?

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bigdog60
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PostPosted: Sat Apr 17, 2010 12:55 pm    Post subject:   Reply with quote

After you get the hose fixed up, if you do not clear the code, it will take 3 consecutive ignitions cycles that the diagnostic runs and does not fail before the light will go out . As far as the shifting goes,you will have to take it to someone that has a scan tool that can read transmission codes (dealer-tranny shop).
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Connersdad19
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PostPosted: Sun Apr 18, 2010 11:23 pm    Post subject:   Reply with quote

replaced the hose and it has been started well over three times so i am unsure as to whats going on...its going to the tranny shop tomorrow.

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PostPosted: Fri Apr 23, 2010 11:46 pm    Post subject:  same problem Reply with quote

So what were the results. I have the exact me thing going on with my wife's car.
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Connersdad19
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PostPosted: Fri Apr 23, 2010 11:52 pm    Post subject:   Reply with quote

have not had the time...with work and all..i am taking it down first thing monday then i will report back.

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PostPosted: Fri Apr 30, 2010 12:34 pm    Post subject:  Fixed Reply with quote

Well hopefully we had the same problems. Replaced both the EVAP Purge and solenoid valve and although the check engine light went out I still had the same issues, upon acceleration the engine RPM would go up but the car would not shift and would bogg while trying to pull any power.
Today I took it to GM and the diagnosis was the catalytic converter. Did not believe it myself but had it done since the converter was still under warranty (89,500 on this car) then had the injectors cleaned while I was there. Just drove the car home and it appears to be fixed.
Stay away from ethanol mixed fuels for any cars that are not FlexFuel. Ethanol may be cheaper at the pump, but it will cost you more in the long run.
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