Tylek101

Hey guys I let my car sit for a couple days...went to crank and drive and it was shirting extremly violently and sometimes it wouldnt shift into the gears.....Then after a while the engine light cam on...on my way hm to park it......I took it to get the code ran today and it was P0700....Transmission control Module.....Can somebody give me some info on that code and location of the actual part....maybe pictures or some sort.......Please help me guys cause at the moment the car is gonna be parked and I dont wanna leave my baby parked....Thanks

JoeVal

The Transmission Control Module (TCM) is a computer subordinated only to the Electronic Control Module (ECU) and responsible for handling automatic transmission operation.

Code 0700 corresponds to Transmission Control System Malfunction.
Its display in 722.X automatic transmissions is more a can of worms than a specific clue. The reasons, transmission maintenance could have been overlooked due to bad original schedule (ATF and Filter replacement might have not been required on User's Maintenance Guide); ATF might have been contaminated by coolant fluid due to Coolant System failure; Valve Tray Unit might have failing/damaged component; electronic failure (connector, cable, circuit component, TCU). Whatever it is may not only be a royal pain, but also quite expensive (Valve Tray, TCU). Make sure whoever is going to trouble-shoot this is very knowledgeable and reliably honest.

Good Luck,

Tylek101

Thanks for the reply....Iam very handy with cars and have had a couple yrs in college for automotive technolgy...just didnt get to finish...I have worked on many cars both foriegn and american...Is there a way I can do these thing or check to see if there in working condition myself?....Something....I mean we all in a Reccession and dont really have alot of extra money to give....Gotta be a way to fix.

ohlord

trans fluid leakage into the tcu.
If fluid wicked up from the electrical connector on the transmission it will cause shifting isssues and that code.
Less than 10 bucks for the upgraded o-ring and connector dry out the leaked fluid replace the connector and your problem should be resolved.

Tylek101

Where is the connector located?????????????

lloyds

Full info here http://www.benzworld.org/forums/w220...n-leakage.html hope this helps

Tylek101

Thanks lloyd but I read that whole thread and it had nothing to do with mine.......

tusabes

that thread is exactly about how to fix it...

Pull out the connector and old o rings , get the o rings, clean out the fluid and bam your fixed for $10

Tylek101

O ok....Ill try that then....thanks

rondocap

I had a problem with the accelerator pedal, the throttle position sensor - and one of the fault codes was this transmission module. It had nothing to do with that, just replaced the pedal - but sometimes it can pop up too for other reasons. (There were a few more codes with it, like the throttle position sensor)

Mbzdoctor

This guys have it all wrong just top off the blinker fluid you should be just fine. Just make sure to use the special TOOL.

Tylek101

Ok So I reset the engine light and it has no come back on at all....But I am seeing the same simptoms....WHAT DO I DO?.....EVERYBODY IS SAYING DIFFERENT STUFF.......please tell me what is blinker fluid?

tusabes

blinker fluid is a joke, someone tells them to check the turn signal blinker fluid when there is no such thing...,

have you cleaned the electrical connector of fluid as described above?

Tylek101

No havent had a chance to fix it yet...Iam going to have to find where its located when I get the car on a lift....Is it accessable without takeN stuff off?...Its on the side of the transmission right?

Tylek101

Ive replaced the Adapter plug but for some reason the light is still on.....ANY suggestions?

tusabes

you have to clear the codes /error messages and then see if it reappears, it doesnt just go out automatically by replacing the plug

Tylek101

We've tried that...they still didnt clear and the transmission still in second gear....please help

salmatari

I have an 01 S430 with this code on P0700, would this also turn on the ABS, BAS and ESP malfunctions. I bought an OBM2 analyzer but it does not give me the code for the ABS light being on, just the P0700 TCM problem, after reading a bunch of posts I think i can narrow it down to the o ring issue bc there is fluid in my driveway. I however reset the code but the ABS light is still on. any suggestions on why the ABS light is on. Would this also cause my steering to feel like there is no fluid in the pump and hard steering. When the car starts the steering is normal but after the first turn of the wheel it tightens up.

Ghulamkhan

Hi guys I am new to the club. So I got a 2001 mercedes s430 and the abs light is on got it scanned and it was the front speed sensor and got that replaced but the light is still on and also the car is in limp mode the first gear revs too high and it kicks in really hard just changed the connector plug that was all but no help with that and also the steering is really hard please help I am like 2 hours away from a dealer so is their I can do myself to fix the problems.

wallyp

As mentioned above, one of the possible causes for transmission shifting problems is ATF (Automatic Transmission Fluid) leaking thru the connector on the transmission and wicking up the wire harness to the (TCM) Transmission Control Module. Stopping the leakage alone does not cure the problem - you have to clean the TCM.



There are several threads here on cleaning the TCM. A greatly simplified version:
Open the SAM (Signal Acquisition Module) under the hood at the base of the right (passenger) side of the windshield.
Find the wire harness with traces of ATF, follow it to the TCM.
Remove the TCM and carefully open it. Use brake cleaner to carefully and thoroughly clean the board.
Replace everything. Repeat if necessary after more ATF wicks into the TCM.


Start by looking at the sticky at the top of the page that says "start here". Look for your problem. Read, read, read. There are several similar threads shown under this answer. Read, read, read.









There

Ghulamkhan

How do I know the abs module is bad and does mercedes star diagnostic have to be plugged in to remove the abs after I put in a new sensor

wallyp

One of the more common reasons for your ABS warning and the shifting and steering problem is a poor connection on one or more of the speed sensors.

mercedes4ever

Its a can of big juicy can of worms, take it to an MB Indie, or just shoot it!

Ghulamkhan

so I am gonna change the conductor plate and flush the transsmisson fluid but I am like 200km away from a mb dealership is it okay to drive my car their and have them hook up star and reset my system.i got the abs code scanned and it said front speed sensor a but I replaced my sensor with a new one does it have to be reset from the dealership

MbSoCalTech

Just buy a scan tool online and reset the codes yourself, check Craigslist, trans control unit should be under passenger footwell area kick panel, pull back the front carpet portion and remove the metal panel at the front.