jadreng

Hi All

My GLK has lost its 4th gear, however 1st, 2nd, 3rd 5th, 6th and Reverse work. I have taken it to the dealer and they suggest it's a loose screw within the gear box. They can dismantle it and attempt to fix it without any guarantee it will work; which may ultimately require a new gear box.

Can someone suggest what my options are or what you would do?
Has anyone had this issue or know if it has occurred before?

It pretty frustrating to find that you purchase a high end vehicle and after 26,000 km you need a new gearbox.

Thanks

Plutoe

Spend the up front diagnostic bucks at the dealer and have them run a quick test--that will give you the fault!!

jadreng

They have done the test and i believe it does not appear with an issue in the quick test, its a mechanical thing - they have had to check the issue with other dealers to verify what it could be. The loose screw inside seems possible however they are not sure until they open it up, i am guessing.

LesF

You should get it fixed. Mechanical things that break tend to break other mechanical things. From the mileage you report isn't your car under warranty for a transmission failure?

jadreng

I don't know what the warranty is for transmission in Europe however you have raised a good point which i will ask, the vehicle has 5 years though don't know if that makes a difference.

Thanks

LesF

[QUOTE=jadreng;6988054]I don't know what the warranty is for transmission in Europe however you have raised a good point which i will ask, the vehicle has 5 years though don't know if that makes a difference.

Thanks[/QUOTE

In the US the warranty is 4yr 50k miles unless there is an extended warranty purchase. Good Luck.

optimusprime m1

Not a screw in the gear box .Do a Google search on as its a comon fault, reading about this yesterday . Some have had this with a vacuum fault ,but mainly electrical ..But dont look at the box .

jadreng

What do you mean by a vacuum fault?

optimusprime m1

.You need to google the problem on missing 4 gear ..Can you do a google search ?

jadreng

As an IT engineer that was my first port of call.

There is no documentation on the issue.

Thanks

optimusprime m1

JADRENG Please do a google search .It will give you a way to reset the transmission ..Do this first .just incase it puts it right for you ..In the google search box put -
Reset Transmission adaptive shifting-How to Pogram
It will take you to MB Medic The ecu will set the auto box up to run after 40 shifts . So a reset could put it right,

optimusprime m1

Also to help you more , members will need to know just what motor you have the profile is not very informative . Like put in your post the type of gearbox and the year of the car .plus the engine type .The more information will help members to help you faster. I can search for you , but could be looking for another tye of gear box.So the out come is wrong ..

jadreng

Thanks, sorry for not putting to much information.

It a Diesel; 2011; GLK-Class; Manual Transmission.

optimusprime m1

Well just what i was saying .The box in questioin is manual .This opens up a new tin of worms . I will check again for you over on my forum in the UK ..

optimusprime m1

Sorry i have to give up on this .I can find nothing about the manual box .And thinking about it if 4th is missing there is nothing outside the box to get it back .I am thinking that the box will need removing to fix this fault .Bad news i think .

optimusprime m1

I am still looking as i am not sure ,but i might find something ..I can see that the linkage has this type of plastic knuckle that come away from the selector arm .But i have to find out if your box is the same.

jadreng

I think that they are going to have to remove the gear box and open it up, but the possibilities as to what is wrong are endless.

I think i am going to contact MB Service Desk in Brussels and explain the issue.

It not as if this happens frequently so it maybe a parts defective, don't think you can brake the inside of a gearbox and if something is loose like a screw, its a manufacturing issue which has led to this.

optimusprime m1

jadreng i wish you good luck . Only thing i find is that , as auto boxes need auto fluid and its vital .Also so manual boxes do use atf . And also manual boxes have to be at the righ level in the gearbox .But also selectors have been talked about if you miss a gear And yes i would get Mercedes involved as it might be a failure on their part

Hugo L.

There are manual GLKs?! And a 2011 vehicle with only 26 000 kms? How?

bop11

Sounds like a syncro is shot. This is a ring that actually connects the gear to the shaft and the gears are always in mesh. The sncro is the device that keeps the gears from crunching when you shift. It is a disk with tabs that slide into the gear hub of gear you select. there are many sycros in your gear box. The one for 4th gear is shot. You can either drive with out 4th gear or have the box removed and rebuilt. Most reliable transmission shops can do this job.
I don't know of many screws inside a gear box. Maybe a bearing holder, but that would not drop 4th gear.

optimusprime m1

jedreng Asking on my merc forum for you They want to know what happens as you get to 3rd gear and you go to select 4th .Can you fell anything in there, any crunching ,or will it just go in to 5th . So i can pass this on if you can say how it its.

AzCamel

Doesn't make sense to me, what do you mean it's a manual and 4th is gone? If it's a manual the it points to synchro/gear issue, you will typical has crunch/grinding noise and feedback when trying 4th gear if it's a manual. It could be synchro, gears l, or forks in most scenario.

Most of the feedback you got is for the auto box