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Old 09-02-2009, 05:19 PM   #1
mhagley323
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torque converter.

I got a code p0741 saying that i had some issues with the torque converter. Took the car to local dealer and as always they recommended replacing the whole thing with a brand new converter for a whopping $3500K.

There is no difference in the way it drives as well as shifting smooth through every gear. No slipping through shifts either.


Does anyone have any recommendations or reputable sites on where i can buy an OEM torque converter for an automatic 03 330i. Any other help as far as diagnosis would be great. Car has about 80K on the dash
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Old 09-02-2009, 06:26 PM   #2
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searched and can't find much on even purchasing an OEM torque converter
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Old 09-02-2009, 06:28 PM   #3
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If theres no problem apart from some codes, whats the problem?
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Old 09-02-2009, 06:32 PM   #4
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i dont want it to result in further problems. if it ended up damaging the transmission as a whole id be out 5000K
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Old 09-02-2009, 06:35 PM   #5
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Old 09-02-2009, 06:39 PM   #6
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Originally Posted by mhagley323 View Post
i dont want it to result in further problems. if it ended up damaging the transmission as a whole id be out 5000K
Well tbh even if your torque converter did go out you wouldn't damage the transmission at all, have you considered the problem could be electrical though? It just seems well over the top to replace the entire torque converter while the car is running as normal.

And I have a few points to add,

Don't go to the dealer. An entire transmission replacement shouldn't cost more than 2,000 dollars. Hell, you could even do a manual swap if you had a shop that was half experienced.

3500K = 3,500,000 dollars. 5000K = 5,000,000 dollars.

As i'm sure you're aware, P0741 means that the torque converter clutch is reported to be stuck off. If the car is driving normally, then your torque converter clutch is working normally and a sensor is relaying bad information or the solenoid in the transmission that controls the torque converter clutch is starting to fail. If it's not driving normally, your first course of action would to be replace the torque converter clutch solenoid which is very cheap compared to the cost of a new torque converter. I'd be very surprised if this didn't fix your problem.

If you're determined to change your torque converter, know this most likely will not fix your problem. I'm sure the dealer knows this.
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Old 09-02-2009, 07:47 PM   #7
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Quote:
Originally Posted by Acarder View Post
Well tbh even if your torque converter did go out you wouldn't damage the transmission at all, have you considered the problem could be electrical though? It just seems well over the top to replace the entire torque converter while the car is running as normal.

And I have a few points to add,

Don't go to the dealer. An entire transmission replacement shouldn't cost more than 2,000 dollars. Hell, you could even do a manual swap if you had a shop that was half experienced.

3500K = 3,500,000 dollars. 5000K = 5,000,000 dollars.

As i'm sure you're aware, P0741 means that the torque converter clutch is reported to be stuck off. If the car is driving normally, then your torque converter clutch is working normally and a sensor is relaying bad information or the solenoid in the transmission that controls the torque converter clutch is starting to fail. If it's not driving normally, your first course of action would to be replace the torque converter clutch solenoid which is very cheap compared to the cost of a new torque converter. I'd be very surprised if this didn't fix your problem.

If you're determined to change your torque converter, know this most likely will not fix your problem. I'm sure the dealer knows this.
Amen brother, quoted because that whole post was damn well said.
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Old 09-02-2009, 09:14 PM   #8
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Quote:
Originally Posted by Acarder View Post
Well tbh even if your torque converter did go out you wouldn't damage the transmission at all, have you considered the problem could be electrical though? It just seems well over the top to replace the entire torque converter while the car is running as normal.

And I have a few points to add,

Don't go to the dealer. An entire transmission replacement shouldn't cost more than 2,000 dollars. Hell, you could even do a manual swap if you had a shop that was half experienced.

3500K = 3,500,000 dollars. 5000K = 5,000,000 dollars.

As i'm sure you're aware, P0741 means that the torque converter clutch is reported to be stuck off. If the car is driving normally, then your torque converter clutch is working normally and a sensor is relaying bad information or the solenoid in the transmission that controls the torque converter clutch is starting to fail. If it's not driving normally, your first course of action would to be replace the torque converter clutch solenoid which is very cheap compared to the cost of a new torque converter. I'd be very surprised if this didn't fix your problem.

If you're determined to change your torque converter, know this most likely will not fix your problem. I'm sure the dealer knows this.

I am open to ideas and would love to not have to replace the whole thing. I just had a bad experience with my usual indy shop so i've been relying on the dealer. I was trying to explain to them that mabey it was electrical.

And your right the code reads:
Probable Cause
-TCC stuck off
-Poor electrical condition
-Low Trans Fluid
-Failed TCC solenoid.

So you suggest the solenoid? What about any sensors?
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Old 09-02-2009, 09:23 PM   #9
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I had my torque converter replaced under warranty at 20k miles in my auto. Then at 75k, the rest of the tranny went and I got a new tranny with a new torque converter.
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Old 09-07-2009, 01:45 AM   #10
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Quote:
Originally Posted by Acarder View Post
Well tbh even if your torque converter did go out you wouldn't damage the transmission at all, have you considered the problem could be electrical though? It just seems well over the top to replace the entire torque converter while the car is running as normal.

And I have a few points to add,

Don't go to the dealer. An entire transmission replacement shouldn't cost more than 2,000 dollars. Hell, you could even do a manual swap if you had a shop that was half experienced.

3500K = 3,500,000 dollars. 5000K = 5,000,000 dollars.

As i'm sure you're aware, P0741 means that the torque converter clutch is reported to be stuck off. If the car is driving normally, then your torque converter clutch is working normally and a sensor is relaying bad information or the solenoid in the transmission that controls the torque converter clutch is starting to fail. If it's not driving normally, your first course of action would to be replace the torque converter clutch solenoid which is very cheap compared to the cost of a new torque converter. I'd be very surprised if this didn't fix your problem.

If you're determined to change your torque converter, know this most likely will not fix your problem. I'm sure the dealer knows this.
Nice post. Good to know that for P0741 it could be also a problematic solenoid for TCC. I have some question in regard. How could I replace a failed solenoid? Could it be done from the bottom part of tranny? Is it necessary to remove the whole valve body? Which is the P/N for the solenoid which engage TCC?
Thanks.

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Old 09-07-2009, 02:02 AM   #11
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Originally Posted by jakajuka View Post
Nice post. Good to know that for P0741 it could be also a problematic solenoid for TCC. I have some question in regard. How could I replace a failed solenoid? Could it be done from the bottom part of tranny? Is it necessary to remove the whole valve body? Which is the P/N for the solenoid which engage TCC?
Thanks.

jakajuka
This is where things get a little more difficult.. i'm not 100% sure how the E46's GM transmissions are assembled but i'm going to make a possibly incorrect statement and say that you are able to replace it without removing the valve body, and that you can access it by just dropping the pan. I can't speak at all for the ZF transmission however but it shouldn't be that different, just no promises it is as easy as dropping the pan and locating the solenoid pack.

I'll have a look for the PN, but I think BMW just sells the whole thing remanufactured.

Edit: I'm a little lost, but heres the realOEM page - http://www.realoem.com/bmw/partgrp.d...41&hg=24&fg=15.

If I were you though i'd just take it to a shop.. this will be a walk in the park for them

Great page here, whole thing broken down into pieces. Looks like you can just drop the pan to replace it

http://www.automaticchoice.com/Catalogue/5l40e.pdf

Last edited by Acarder; 09-07-2009 at 02:20 AM.
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Old 09-07-2009, 08:56 AM   #12
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The TC pressure regulator (aka solenoid) is accessible after dropping the pan on the GM tranny. I would get someone with INPA (diagnostic software) to see what is going on in real time with the regulator/solenoid before moving forward.
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Old 09-07-2009, 02:15 PM   #13
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The TC pressure regulator (aka solenoid) is accessible after dropping the pan on the GM tranny. I would get someone with INPA (diagnostic software) to see what is going on in real time with the regulator/solenoid before moving forward.
I got an Inpa/Ediabas software for diagnosis. Could You tell me where to look at to realize if the regulator/solenoid is working well? Thanks.
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Old 09-09-2009, 02:08 PM   #14
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Quote:
Originally Posted by David F View Post
The TC pressure regulator (aka solenoid) is accessible after dropping the pan on the GM tranny. I would get someone with INPA (diagnostic software) to see what is going on in real time with the regulator/solenoid before moving forward.
I have a screen capture from INPA. Please look at them and told me if I have the right option to realize that solenoid for TCC is OK.


Thanks
Bye
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Old 09-09-2009, 02:13 PM   #15
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Old 09-09-2009, 03:37 PM   #16
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You need a convertere there are TSB's from BMW about this and the lip seal rolling. SEARCH I POSTED THIS MANY TIMES!!!!!!!!
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Old 02-12-2010, 03:07 AM   #17
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Hi,

replaced a TC last week after find out an error "slippery TC clutch".
I put in a rebuild one and solved the problem. Now the tranny is more efficient (1.5 litre less petrol consumption on 100km) and the car run smoother!!!

If You have the same problem do not hesitate and change the TC.

Bye.
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Old 02-12-2010, 03:10 AM   #18
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Torque converter is basically a hydraulic clutch. Symptoms are same as a bad clutch - excessive RPM increase in relation to actual vehicle speed (RPMs climb faster than you actually go). Do you notice that? Also it can tend to make a pretty loud noise it badly worn enough...
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Old 02-12-2010, 03:54 AM   #19
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Originally Posted by jakajuka View Post
Hi,

replaced a TC last week after find out an error "slippery TC clutch".
I put in a rebuild one and solved the problem. Now the tranny is more efficient (1.5 litre less petrol consumption on 100km) and the car run smoother!!!

If You have the same problem do not hesitate and change the TC.

Bye.
I would hesitate, it's not exactly a 5 dollar fix
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Old 02-12-2010, 04:43 AM   #20
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I would hesitate, it's not exactly a 5 dollar fix
I agree with You.

But I made a calculation that only calculating the consumption reduce the payment will return in 2 years!!!

On other side I want that my car is mechanical on top.

bye
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