holger

I can confirm that LI27.19-P-056610 fixes the rough shift problem for my 2014 C300. Took it to the dealer with the TSB in hand, at first they looked at it and said it only applied to E-class because the TSB says "Only for 212 with M276 experiencing harsh 4-3 4-5 complaints", but after researching they did the update and charged me half hour labor. Problem solved.

Tom in Austin

Interesting example of how closely related E and C models are mechanically ...

BTFanC300

To whoever this may help-

I found a copy of the TSB L127.19-P-05-6610

xsever

Thanks a lot for sharing it. Finally someone found it. I am sure this will prove helpful to a lot of people suffering from the transmission jerk.

BTFanC300

Just to give everyone an update.

So I had my planetary gear replaced a few months ago, which actually helped a lot with the transmission jerk on my 2014 C300 (among other things).

However I still wanted this update so I went back and said that as part of the repair, they should've also updated my transmission.

Long story short, I got them to do it for free. While I wouldn't say the transmission is perfect, there is definitely a noticeable improvement - and this is on a car with almost 200,000km!

avong

I just want to bump this post to let people know that the software update works and fixed my 2014 C300 transmission where the car jolts from 4 to 5. The car shifts smoothly now

Radu Pietrosanu

Have the same problem with my 2015 c300 4matic. Took the car to the dealer 3 times with no result! Did software update, transmission service, checked the valve body with the solenoids, everything is fine. 1600$ later the car jerks violently when I accelerate on a cold start! Don’t know what to do at this point!

Radu Pietrosanu

I have a 2015 C300 4matic with the same problem!

Radu Pietrosanu

Don’t want to break your hopes but I have a 2015 C300 4matic and I have the same problem. Violent jerking motion (back and forth) when I try to accelerate really hard! The car is in the service for the 4th time . Complained to Mbzusa and they said I should change the service! Waiting for updates, did software update, transmission service, checked transmission, valve body they said everything is fine!

Radu Pietrosanu

Update! I got my car back today! They ended up replacing the valve body, the car drives really nice, no jerking motion or unusual gear changes! The part has a 2 year warranty with unlimited miles! They test drove the car and did a cold start drive test with no issues! Hopefully this solves the problem! I’ll keep you updated throughout and see how it goes!

xsever

Thank you for the update and congrats on getting it solved. One should really stay away from the 2015 C300: it can have the wrist pin problem in the engine and now this with the valve body.

BTFanC300

I mean you can say the same about the 2014 w204... after all, that's the model this thread was made for. I also heard the same thing regarding the 2014 - that the valve body is the cause of the transmission jerks.

Anyone know how much a valve body repair/replacement costs at the dealership?

Radu Pietrosanu

Update. After a week driving with the new valve body the problem reoccurred today on a cold start, with jerks from 2-3 and 4-5 gear! I’m puzzled, the transmission has to be faulty straight from the factory!

Roni07

Sorry to hear that, it must be really frustrating. It’s weird that the car drove smooth and now back to original problem. I wonder if it’s something else.

Radu Pietrosanu

It’s just unacceptable! Very very frustrating!

xsever

Sorry to hear this. It's these experience that makes one hate a certain brand if the dealer is not proactive and willing to go above and beyond to keep the customer happy. What are you going to do now?

Radu Pietrosanu

Fortunately I have a deal with the service manager at Mercedes which states that if they can’t fix the car they will refund me the money for the repairs! He asked me to leave the car for 2 weeks, gave me an E 350 as a loaner!

Radu Pietrosanu

Update on 07/01/2020. Got my car back again and Mercedes service gave up, got my 900$ refunded back to me after replacing the valve body! They can’t figure out what’s wrong with the car! Very very dissatisfied with the car, the jerk happens almost all of the time when I accelerate a little bit harder! I guess it’s time to call a lawyer!

xsever

I'm sorry to hear you're still going through this? I am sure they opened a case with MB Germany and as a result, since they are unable to fix the car, why don't they replace the entire transmission with a brand new one with all the updated parts (if any) and updated software?

Radu Pietrosanu

After they did the software update which was recommended from a different service that dealt with the same problem, the other owner ended up replacing the transmission which still didn’t fix the problem! Even the service manager recommended not replacing the transmission, for a car that has 47k miles that’s unacceptable!!

xsever

What a mess! Your next step should be to contact MB USA and raise a case with them and let them handle the dealership and the problem. Make sure you attach all the service paperwork you have and explain clearly what happened. I think you can call them first and then send an email with the attachments.

Radu Pietrosanu

I already called Mbz USA 2 times and I have talked to them explaining them the situation, I have a case, got the same text from 2 different people telling me that I should try a different service shop!

xsever

Did you try a difference service shop? Give it a chance and maybe they know what they're doing. You'll have a loaner in the meantime and that's alright since you will be showing them that you went by their suggestion. If it's successful, you win. If not, you threaten them with lawyering up and see how they respond.

Roni07

-:; Yes it’s unacceptable for sure. It’s probably not a mechanical issue but a software, giving mixed signals to the transmission, causing jerking. I would never buy it own MB ever again. Used to be very good and reliable up until the late 1990 , then they lost the way. You are better off with Hyundai or Toyota, Honda vehicles. The Japanese knew this and that’s why Toyota is very conservative in their approach to mechanics and electronics. Keep it simple is the best way. MB is also extremely expensive, if an issue arises, huge headache