ATF in Transmission Control Module: 99 E 320 - Mercedes-Benz Forum
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post #1 of 167 (permalink) Old 05-19-2009, 08:12 PM Thread Starter
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ATF in Transmission Control Module: 99 E 320

My car is currently running in limp mode ( only 1st or 2nd gear ).
CEL currently ON. Code : P0715.

Found out that the TCU is completely flooded with ATF ( the infamous wicking problem ).Cleaned the Transmission control unit with Electrical parts cleaner and dried it, But the problem still persists. I'm at a loss as to the next step.

I find a leak near the transmission Plug and plan to change the AT electric Plug.

What would be the next steps to fix the issue?.

Should I change the Transmission Control Module? or the Conductor plate next?.
How much does a new TCM cost?
The dealer quoted $308 for a new Conductor plate.

I went to an Indie and was quoted as follows:
1. $540 to clean the leak and change the AT electric plug.
2. $1000 to replace the TCM if step1 does not fix the issue.
3. $600 to replace the Conductor plate if steps 1. and 2. does not fix the issue.

Any help is truly appreciated.
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post #2 of 167 (permalink) Old 05-19-2009, 08:18 PM
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That is an unusual limp.

Do you have reverse? If not, what happens if you shut down the engine and then restart?

If I were you, I would do 1, 3, then 2. 1 could be done by you.

Most of the P0715 (if that is the only code) I have seen could get out of limp after shutdown.

I am also experiencing this on my 1997 intermittently and changed the internally leaking connector yesterday. There should be codes in the TCM but there is no place that I can take to to have them read/cleared. I can always get out of the limp with a shutdown.
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post #3 of 167 (permalink) Old 05-19-2009, 09:23 PM Thread Starter
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The car is running in limp mode ( but I cannot say if its 1st or 2nd gear ).
Reverse works. But the shift from P to R or D is jerky.
Shutting down and Restarting does not make any difference.

I cleaned the TCM but Is it true that I cannot get the car out of the limp mode until the TCM error codes are cleared by Mercedes Specific Scan tools?. I went to AdvanceAuto parts and cleared the P0715 code, but it keeps coming back.

Good that you are able to get out of limp mode with a shutdown - Did you also find ATF in the Transmission control module?.
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post #4 of 167 (permalink) Old 05-19-2009, 09:36 PM Thread Starter
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I read in another thread that we can reset the ECU and TCU by the following procedure, did anyone try this?. Will this reset the TCU error codes?.

------------------------------------------------------
- Turn the ignition key to the on (not start) position
- Press the gas pedal to the floor and hold for five seconds
- Turn the key to the "off" position (don't remove the key), then release the gas pedal
- Wait at least two minutes for reset

Resets the adaptive settings back to factory settings until your driving habits are re-learned.
--------------------------------------------------------------------------------
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post #5 of 167 (permalink) Old 05-19-2009, 09:36 PM
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Hi Guys....

Say, what is the Conductor Plate and where is it located?

Thanks...
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post #6 of 167 (permalink) Old 05-19-2009, 10:03 PM Thread Starter
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Conductor Plate is located in the valve body at the bottom of the transmission. ( ie. after you open the pan ). The conductor plate has a built-in speed sensor which sometimes throws the error code : P0715.
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post #7 of 167 (permalink) Old 05-20-2009, 06:07 AM
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Quote:
Originally Posted by 99w210 View Post
The car is running in limp mode ( but I cannot say if its 1st or 2nd gear ).
Reverse works. But the shift from P to R or D is jerky.
Shutting down and Restarting does not make any difference.

I cleaned the TCM but Is it true that I cannot get the car out of the limp mode until the TCM error codes are cleared by Mercedes Specific Scan tools?. I went to AdvanceAuto parts and cleared the P0715 code, but it keeps coming back.

Good that you are able to get out of limp mode with a shutdown - Did you also find ATF in the Transmission control module?.
You do have the (electric) limp, i.e., 2nd and reverse.

OBD II scanner cannot clear the codes stored in the TCM. The codes themselves can throw the same codes until they are cleared. The P0715 is just a generic code. The ones in the TCM are like 11, 12, etc. I am looking into Carsoft 7.4, which can clear the codes.

I did not find fluid in the TCM. It was dry, although I did not remove it to check.

The reset procedure you posted in a later post will not clear the codes either.
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post #8 of 167 (permalink) Old 05-21-2009, 06:55 AM
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hi, could someone please tell where the TCM that gets flooded with transmission fluid is located on a 1997 e230 5speed auto w210, thank-you..
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post #9 of 167 (permalink) Old 05-21-2009, 07:08 AM
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Originally Posted by mercguy230 View Post
hi, could someone please tell where the TCM that gets flooded with transmission fluid is located on a 1997 e230 5speed auto w210, thank-you..
You did not read the reply to one of your threads about the same questions?

https://www.benzworld.org/forums/w210...trol-unit.html
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post #10 of 167 (permalink) Old 05-21-2009, 10:40 AM Thread Starter
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An observation with regards to checking for Fluid in Transmission Control Module:

Initially, when I looked at the TCM/TCU I did not notice any fluid and thought that it was clean. But, I realized later that I had to pull out the connectors that go into the TCM unit to see any traces of Transmission Fluid. After I pulled the TCM out, I saw that it was flooded with fluid.
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