C63 W204 Drive problem

[d0bbsy]

Hi Everyone,

I went to get the car alignment done today but ran into a problem where the car was just revving not driving forward, I selected reverse and drive a couple of times and everything was fine for the trip there and back (around 45 Miles) gave it plenty of beans there and back and was driving fine.

I've left the car to sit for 5 or so hours and just tried it round the block and its doing the same barely driving forward, its like having a slipping clutch on a manual car.

There are no lights on the dash but my friend is going to lend me his scanner tomorrow in the hope it brings something up but I'm sure its going to be a specialist job.

Has anyone else had this before ? I'm booked to go Germany in a couple of weeks and I'm panicking .

 

[Petrol Pete]

When was the transmission last serviced ?

 

[d0bbsy]

When was the transmission last serviced ?

Hi Pete, Not sure it has full Mercedes service history its a 2014 with 58k on the clock I will check as soon as I'm home

 

[d0bbsy]

Just looking now and I have one from 2017 31k and was oil and filter changed.

I cant see more so I think its only been changed once......

 

[pcthrillrider2]

i would check the gearbox oil level

 

[d0bbsy]

i would check the gearbox oil level

Yeah it’s overdue really I thought it was done not so long ago but I’m mistaken. I’ve just ordered a genuine service kit with new bolts, I will do some searching to the torque settings

 

[pcthrillrider2]

i didnt mean to service it just check the oil level you will need to buy a dipstick and new red cap

 

[Jobsworth]

i didnt mean to service it just check the oil level you will need to buy a dipstick and new red cap

It’s a 722.9, no dipstick, just saying

 

[Petrol Pete]

DIY 722.9 7G-tronic 7-speed automatic transmission service thread - MBWorld.org Forums

C-Class (W203) - DIY 722.9 7G-tronic 7-speed automatic transmission service thread - So, I just completed the 2nd 722.9 7G transmission service, so I have decided to start a thread and post a DIY write-up. As most of you know the 722.9 transmission does NOT have a dipstick tube, so checking...

mbworld.org

 

[jasonh]

I'd save that service kit until you've checked the oil level.

I'd also make sure you properly read the fault codes - with something than can read all the gearbox codes fully.

Low oil maybe but unfortunately sounds to me like a problem with the MCT (torque converter replacement).

 

[Petrol Pete]

The Definitive Guide to the Mercedes 722.9 7G-Tronic Transmission

Mercedes has a long history of designing and developing their own automatic transmissions. Where many companies reach out to dedicated transmission manufacturers, you can find Mercedes units in American and German-made vehicles. The 722.9 was the go-to in the mid-’10s and is found in nearly every...

www.fcpeuro.com

 

[Petrol Pete]

Mercedes-Benz 7-Speed Transmission (722.9) Service Walkthrough

To ensure long life and peace of mind in your seven-speed (722.9) Mercedes-Benz automatic transmission, periodic service is a must. Many manufacturers, including Mercedes, claim that their transmission fluid is for life, but that's simply not the case. Instead, follow this service procedure to...

www.fcpeuro.com

 

[pcthrillrider2]

It’s a 722.9, no dipstick, just saying

yes is why i said you need to buy one!

 

[Jobsworth]

yes is why i said you need to buy one!

Lol! If you can find a tube to poke it in on a 722.9 I will be impressed!

 

[d0bbsy]

Hi guys just an update.

I followed the procedure and changed the transmission fluid with a new filter and bolts and ran it to 45c and then let the excess oil out.

Its shifting totally fine now, the fluid looked ok but the sump and old filter was quite dirty.

I also changed the oil and filter in the engine at the same time, but its now developed another fault that I never noticed before. When accelerating hard I get a weird whine like a supercharger type sound. It was very noticeable on the first drive but hardly there now.

I'm not sure if its just me being looking out for every sound it makes thinking there's a fault but definitely never noticed it before.

Any Idea's ? I should be going Germany Thursday but wondering if I should take it now.

Thanks everyone.