Need help with tranny on 1998 ML320 - Mercedes-Benz Forum
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#1 (permalink) Old 01-28-2012, 12:52 AM
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Need help with tranny on 1998 ML320

Hi
I was having problems with my tranny going into limp mode, took it to AAMCO and they pin pointed it to the TCM and the Transfer case shifter motor.
Now my question is is where is the TCM located and is the TCM and TCU the same thing?
My truck is a 1998 ML320, tranny is 722.6
Im hoping to do the work myself, cause the dealer wants to much to do it.
Thank you
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#2 (permalink) Old 01-28-2012, 03:40 AM
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What codes did they give you?
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#3 (permalink) Old 01-29-2012, 12:59 AM
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Trans code 065, 135, 137
That is what aamco gave me a copy of thats all the paperwork shows and the mechanic said it was the TCM and the Transfer case shifter motor.
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#4 (permalink) Old 01-29-2012, 03:39 AM
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Don't know which problem you are experiencing but read the list and pick the best one that applies.

Code 065 relates directly to the ETC (Electronic Transmission Control) Module

Codes 135 & 137 are CAN problems with the Eng. Control Mod. and Transfer Case Control Module.

Have you recently tried to use the Low Range feature? Or did it never work?

You might also want to check if there is trans. fluid between the two halves of the 13 pin connector on the right side of the transmission. If so the connector needs replacing.
Attached Files
File Type: pdf 127.0.0.1_38562 - m1.pdf (78.4 KB, 217 views)
File Type: pdf Trans. Codes, Tests & Pin-Out.pdf (51.3 KB, 180 views)
File Type: pdf Trans. 13 Pin Connector TSB.pdf (273.2 KB, 301 views)

Last edited by 43sqd; 01-29-2012 at 03:45 AM.
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#5 (permalink) Old 01-29-2012, 10:26 PM
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I havent checked for leaking fluid, that was going to be my next step. But AAMCO said they checked it and they said it wasnt leaking, but i dont know if I should trust them. I was trying to find out where the TCM was located, cause theres a junk yard that has the same year and model car and I was going to see if i could get the TCM cheap.
Do you know where to find the TCM?
Im just trying to fix the car the cheapest way I can.
Thank you for your help
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#6 (permalink) Old 01-29-2012, 10:36 PM
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Im not sure you can just transplant in another TCM from a different truck without issues. Im sure someone who is sure will follow this response.
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#7 (permalink) Old 01-30-2012, 04:21 AM
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Originally Posted by BIGAZDAWG View Post
I havent checked for leaking fluid, that was going to be my next step. But AAMCO said they checked it and they said it wasnt leaking, but i dont know if I should trust them. I was trying to find out where the TCM was located, cause theres a junk yard that has the same year and model car and I was going to see if i could get the TCM cheap.
Do you know where to find the TCM?
Im just trying to fix the car the cheapest way I can.
Thank you for your help
You are going about this the wrong way because you are believing AAMCO. They are in business to make business and you are taking them for their word.

Here are the instructions to remove the ETC Module. Remove the cover below the instrument panel and look up to the right and you will see it. Pull the module out of the bracket and obtain the full number of the module. It will be 022 545 xx xx. Post the last 4 numbers.
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Attached Files
File Type: pdf R&I Cover Below I.P. Left.pdf (35.5 KB, 196 views)
File Type: pdf R&I Trans. Control Module.PDF (35.4 KB, 287 views)

Last edited by 43sqd; 01-30-2012 at 04:32 AM.
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#8 (permalink) Old 01-30-2012, 04:59 PM
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I pulled the 13 pin connector out and it was soaked, it actually looks like AAMCO never got underneath my truck. I replaced the transmission wire harness adapter and I even replaced the brake light switch( ETS light was on). Now there are no lights. Im taking it later tonight for a test drive to see if it is fixed. I hope it is.
I want to thank you for all your help, you are a wealth of knowledge and i'm grateful for all your help. Who knows I might need your assisstance in the near future. Thank you, you saved me a bundle of money.
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#9 (permalink) Old 01-30-2012, 07:34 PM
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I took it for a long drive and when I got close to my house> I stopped and turned it off to see if it would still go into limp mode. It did go into limp mode so Im back to that problem, but since I did the new plug adapter on the tranny, do you think it would be the Transfer case shifter motor? I havent looked at the TCM yet. I plan on doing that tomorrow.
Again any help you can give is very much appreciated.
Thank you
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#10 (permalink) Old 01-30-2012, 09:00 PM
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The codes need to cleared from the TCM first then the ECU event memory or it will keep going into limp mode even if the leak is fixed.
I high end shop grade scan tool or MB SDS computer are the only scan tools that can do that.

If clearing of the codes does not work than it may be time to look at them one by one and
hope the conductor plate is not fried from the leak.
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