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Hello all, I had just finished up with a transmission fluid and filter change on 06 CLS 55 AMG... I just did the pan fluid not a full flush and I changed the electrical sleeve that leaks past the o-rings and mine had some leakage. I had a problem with the cam style connector shearing the tabs that draw the connector harness into the sleeve. I drove the car with connector seated 95% (best I could get) and it shifted fine and no CEL on till after I reset the adaptive shift parameters:
LAST STEPRESET TRANSMISSION ADAPTATIONS
1. From a car that is totally off, insert key into ignition. Push gas pedal to floor and hold it.
2. While holding the gas pedal floored down, turn the key to position 2 (all warning lights come on), but do
NOT start the car, and count for 5 seconds.
3. Turn key back to position 1 (accessory only), you can now let go of the gas pedal.
4. Wait a full 2 minutes of doing nothing inside the cardo not exit the car or mess with radios/windows/etc.
wait the full 2 minutes.
5. After 2 minutes has elapsed, you can now start the car and drive off with smooth and crisp shifting as your
car resets its shift adaptations on new ATF fluid.
After that the trans would not shift and was stuck in second (limp mode) so I got a new connector sleeve and robbed the yellow fastener piece off it and put it on my new sleeve in the trans and I was able to get the harness connector to seat fully. I test drove it after and no change still stuck in 2nd. So I run through the aforementioned resetting of adaptive shift parameters again and drive then I get two codes for shift solenoid A and B and a check engine light on. I clear the codes successfully and test drive and yet still stuck in second.
Kind of stuck on what to do now. I am fairly familiar with auto transmissions but mainly Allison's. Why did resetting the adaptive shift parameters cause this. I was leary of doing so because it's not necessary when just changing pan fluid and filter but I thought it may firm up the shifts some.
Complete newb here, but did you check the TCM to make sure it was dry? You mentioned there was oil in the connector in your other thread.
Also, are you sure you cleared the TCM codes that are keeping your car in limp mode? I was under the impression that most generic OBD readers can't do this.
Hopefully others with more experience and knowledge will chime in.
If stuck in 2nd gear that indicates an electrical fault. A mechanical/hydraulic fault you can clear by key off/on.
Once an electrical fault code is set, you must clear it with STAR/DAS/Xentry. There may be non-OEM code readers that can clear the fault but I can't name any off the of my head. edit: if you are clearing with a capable code reader and the codes keep coming back, most likely culprit is the adapter has bent pins or, unlikely but always possible, you had two shift solenoids malfunction simultaneously. That I find hard to believe so I keep coming back to the conductor plate or the connector.
EDIT: I would hypothesize the error was caused by a bad electrical contact on the sleeve; most likely two of the three pins 8,9,13. Also, I would not reset adaptations unless you have replaced the conductor plate or performed major transmission work. There is a factory recommended procedure used to adapt the transmissions that involves multiple low-torque pulls from gear to gear without exceeding 1800 rpm; after doing so, the car should idle for 10 minutes to allow the adaptation data to be transmitted and stored in the TCU. The document I have is 106 pages long so it's kinda hard to summarize.
Complete newb here, but did you check the TCM to make sure it was dry? You mentioned there was oil in the connector in your other thread.
Also, are you sure you cleared the TCM codes that are keeping your car in limp mode? I was under the impression that most generic OBD readers can't do this.
Hopefully others with more experience and knowledge will chime in.
Hello thank you for the reply. There was very little oil in the connector and the transmission worked without flaw before I did all of this but the real turn of events occured when I reset the adaptive shift parameters. I am kicking myself now for it since I know it was not necessary since no major transmission work was done. The codes I could see with my obd scanner are gone but if they're is something hidden that only Stars can see I don't know. The CEL went off and I tried 5 key on key off cycles to try and reset.
Is it recommended to disconnect the battery for a while?
Complete newb here, but did you check the TCM to make sure it was dry? You mentioned there was oil in the connector in your other thread.
Also, are you sure you cleared the TCM codes that are keeping your car in limp mode? I was under the impression that most generic OBD readers can't do this.
Hopefully others with more experience and knowledge will chime in.
Originally Posted by bbirdwell
If stuck in 2nd gear that indicates an electrical fault. A mechanical/hydraulic fault you can clear by key off/on.
Once an electrical fault code is set, you must clear it with STAR/DAS/Xentry. There may be non-OEM code readers that can clear the fault but I can't name any off the of my head. edit: if you are clearing with a capable code reader and the codes keep coming back, most likely culprit is the adapter has bent pins or, unlikely but always possible, you had two shift solenoids malfunction simultaneously. That I find hard to believe so I keep coming back to the conductor plate or the connector.
EDIT: I would hypothesize the error was caused by a bad electrical contact on the sleeve; most likely two of the three pins 8,9,13. Also, I would not reset adaptations unless you have replaced the conductor plate or performed major transmission work. There is a factory recommended procedure used to adapt the transmissions that involves multiple low-torque pulls from gear to gear without exceeding 1800 rpm; after doing so, the car should idle for 10 minutes to allow the adaptation data to be transmitted and stored in the TCU. The document I have is 106 pages long so it's kinda hard to summarize.
Hello, I checked inside the connector with an inspection mirror and pins looked clean and not bent from what I could see. Thus far after clearing the codes they have not reset however the limit to second gear remains. I would be interested in viewing the document you are referencing. I too find it hard to believe that two shift solenoids failed simultaneously.
Hello, I checked inside the connector with an inspection mirror and pins looked clean and not bent from what I could see. Thus far after clearing the codes they have not reset however the limit to second gear remains. I would be interested in viewing the document you are referencing. I too find it hard to believe that two shift solenoids failed simultaneously.
Thank you!
PM me your email address. What piece of equipment are you using to clear the codes?
EDIT: I looked at the photo; appears to be OBDCOM?
EDIT2: website says it will clear codes and limp mode...looks like you'll be able to provide customer feedback on that. Clearing the adaptations should not have killed proper functioning of the TCU but, again, it's an aftermarket system that just accessed your TCU. You should see if there is anyone in your area with a STAR-based system and see if that will take the car out of limp mode; would literally take five minutes.
PM me your email address. What piece of equipment are you using to clear the codes?
EDIT: I looked at the photo; appears to be OBDCOM?
EDIT2: website says it will clear codes and limp mode...looks like you'll be able to provide customer feedback on that. Clearing the adaptations should not have killed proper functioning of the TCU but, again, it's an aftermarket system that just accessed your TCU. You should see if there is anyone in your area with a STAR-based system and see if that will take the car out of limp mode; would literally take five minutes.
Thank you I will! Yes I used obdcom though I have on order an Autel MaxDiag Elite MD802 which states it can access the TCU and can be used on Mercedes Benz. I would love a STAR system u just have to do more research since there is a lot of Chinese variants out there. There is a good independent Mercedes-Benz specialist shop near by if this new scanner fails to do the trick too.
Hello, so the Autel md02 would not even power up when plugged into the obd2 port. So I returned it and got an icarsoft mbii scanner which is only for Mercedes-Benz. I could access the TCM and see beyond the generic obd2 codes. Please see images. As you can see the transmission is still running in emergency mode which is why I think it does not recognize the shift buttons on wheel or inputs from manually shifting gears and also that the target and actual gears are implausible. The code P2101 will reoccur after clearing however MIL is not illuminated yet anyways. The trans harness is fully seated. I am confused why this is not clearing unless something in conductor plate is messed up now or the wiring or solenoid itself is shorted. All worked fine before I did the connector sleeve and trans fluid/filter change. Is there something within the XENTRY DAS STAR system that can still reset this?
Thanks before I take it to a shop.
So if a conductor plate is bad, car can be driven but wont come out of 2nd gear, not even to 1st, Winter and Summer modes are also not working. Correct?
My car has a good reverse idle power and also to the front, id say its just electrical.
If we unplug the cable makes no difference, right? It will be driveable but just on second gear (and reverse of course)
My car will not go in limp mode, i can rev it to the max while driving or stopped.
Thanks in advance for your input on this.
Hello, all electronically controlled automatics will default to the last known good shift sequence and stay there in a limp mode. It may be 3rd, it may be 2nd, just depends? I would leave cables and harnesses plugged in and get your car to a shop or if you plan do so the work yourself. Best idea is to pull tcm codes and see what's at fault.
09-23-2017, 07:18 AM
