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Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 22743
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2004 m-class 270 auto 93000 miles, the transmission

Customer Question

i have a 2004 m-class 270 auto 93000 miles, the transmission is occasionally slow to pick up drive after it has been standing for some time eg over a weekend, and it has started to jump out of drive momentarily now and then, mainly when cold or pulling uphill. is there anything you can suggest I can check - atf level is fine - or does it sound like early onset of a major problem ?
Submitted: 2 years ago.
Category: Mercedes
Expert:  Matt replied 2 years ago.
I'd 1st take a look at the colour of the transmission oil it should be a dark red colour if its black then its needs changing together with its oil filter. Also check its level with the gearbox warm and just after you've moved the selector through all the positions leaving it for a few seconds in each one and then back to park.
You can top up the box through the side fill plug if required and make sure you use the correct oil for your car as the fluids are not all the same. Some manufacturers recommended a change of the type of fluid - Speak to the local dealer and parts dept - they will advise you on the updated fluid to use..
If that’s all OK then check all the electrical connections of the gearbox, remove each connector in turn and spray with contact cleaner. Check that the wiring to the gearbox is in good condition with no chafing or frayed wire
If this is OK then check the selector lever linkage / cable under the car for any broken parts and or missing bolts as if this is coming adrift then it can rub on the car body or just bind up
Then - you should top up if low and re try it - or, if its level is ok - and condition is ok - then the next step is to drain it off - open it up and clean the filters inside -- refill and retry it..
Customer: replied 2 years ago.
Hi Matt, does your last paragraph refer to opening up the actual transmission casing to get at internal filters, and are they able to be cleaned manually rather than sealed units which have to be replaced ? will I have to remove the transmission from the car in order to open it up ?
Expert:  Matt replied 2 years ago.
hello yes to access the filter screen you have to remove the sump pan and this is all possible with the transmission in the carthe filters are a washable element so just a good squirt of brake cleaner to flood them through and a wipe over with a lint free cloth is all that's required
Customer: replied 2 years ago.
Thanks - I will try this as advised !
Expert:  Matt replied 2 years ago.
no problemBear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you