9g-tronic potential issue
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Junior Member
Joined: Aug 2017
Posts: 16
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2008 E500/ 2009 A180/ 2010 C220
9g-tronic potential issue
Hi guys, i've had an s212 e300 diesel with 9gtronic for a year now and it was going more or less with no issues. 2 weeks ago however the swirl flaps finally gave up. I brought it to a certified shop (not the dealer) and they did an amazing job, the car runs fine and the mpg got better.
Today however i've noticed something strange - the car wouldn't shift past d7 before i hit 100km/h and before it was hitting d8 at 80. Also it was starting on transmission E mode, before it was always on E+ unless i changed it manually. I did change it to E+ and it started up-shifting early again (d9 at 100km/h) HOWEVER, it started switching off-gear (indicator shows D only, no number to it and revs fall to 700) when i lift my foot off the gas, like it goes to neutral, something it has never done before. It does it only on E+ mode. The tranny shifts smoothly, no shakes or hiccups, still...
My question is, is this something i should worry about or this is just the way it is intended to work? Also, is there any difference between the E and E+ modes other than that in E+ the start/stop function is engaged?
Today however i've noticed something strange - the car wouldn't shift past d7 before i hit 100km/h and before it was hitting d8 at 80. Also it was starting on transmission E mode, before it was always on E+ unless i changed it manually. I did change it to E+ and it started up-shifting early again (d9 at 100km/h) HOWEVER, it started switching off-gear (indicator shows D only, no number to it and revs fall to 700) when i lift my foot off the gas, like it goes to neutral, something it has never done before. It does it only on E+ mode. The tranny shifts smoothly, no shakes or hiccups, still...
My question is, is this something i should worry about or this is just the way it is intended to work? Also, is there any difference between the E and E+ modes other than that in E+ the start/stop function is engaged?
Out Of Control!!
Joined: Apr 2019
Posts: 11,963
Likes: 6,803
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
goody...
Nothing in this sounds abnormal. You may want to buy yourself a proper OBDII scanner to query your transmission directly for any issue.
To be friendly with your tranny, get the ATF replaced every 35 to 50kMi.
There is no fine filter to catch the clutch-sludge so it keeps circulating around grinding until it's drained out. The internal strainer is great at catching chunkies not "dust" particles like engine filter can.
I think you're golden so far.
🤞
++++ "Networked modules".... :
The tranny shifts performance are directly affected by the ECU.
The ECU is affected by F-SAM timely performance, in addition to other CAN-C modules stringed to ECU, TCU such as 3-phase Fuel Pump controller.
To get a well working responsive tranny, pretty much the whole car needs to work well because all modules are cascaded towards the ECU.
To be friendly with your tranny, get the ATF replaced every 35 to 50kMi.
There is no fine filter to catch the clutch-sludge so it keeps circulating around grinding until it's drained out. The internal strainer is great at catching chunkies not "dust" particles like engine filter can.
I think you're golden so far.
🤞
++++ "Networked modules".... :
The tranny shifts performance are directly affected by the ECU.
The ECU is affected by F-SAM timely performance, in addition to other CAN-C modules stringed to ECU, TCU such as 3-phase Fuel Pump controller.
To get a well working responsive tranny, pretty much the whole car needs to work well because all modules are cascaded towards the ECU.
Last edited by CaliBenzDriver; Sep 24, 2022 at 10:35 AM.
Super Member
Joined: Jun 2022
Posts: 739
Likes: 328
From: WA State, USA
2014 Cummins, 2014 E250 Bluetec
Agree with above.
another thing is the engine is probably running stronger now and different thrn before so changing how the trans reacts. Ofcourse doesnt explain the e e+ change.
another thing is the engine is probably running stronger now and different thrn before so changing how the trans reacts. Ofcourse doesnt explain the e e+ change.
