I have a 2019 E300 with the 9 speed Gtronic transmission. Can it be reprogrammed by the owner like the earlier 7 speed Gtronics or does the dealer have to do it

TIA

 

Unplug the battery for a couple of hours and it'll reset it on it's own to relearn the driver interaction.

 

Originally Posted by jenz
Try a transmission reset

If you have KEYLESS GO do not remove the Start button.
1. Press Start button twice. This sets it to key position 2.
2. Floor gas pedal for 10 seconds.
3. Press Start/Stop once. This turns it OFF.
4. Release gas pedal and wait two minutes.
5. Then start the engine and begin driving.

Other option (not KEYLESS):
1. Turn the ignition key to the ON (not start) position.
2. Press the gas pedal to the floor and hold for 10 seconds.
3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.
4. Wait at least two minutes for ECU to reset. When the 2 minutes are up take your foot off the accelerator and start the engine. Drive away and you should notice a more responsive transmission for a while.

 

This misinformation needs to stop being spread, I see it posted on every transmission related thread. This procedure doesn't "reset" anything, its just an old myth. All this does is trick the car into thinking that you are driving in a more spirited fashion by holding down the pedal to the floor with the ignition on, this will just temporarily increase pedal response to adjust.

 

[ This procedure doesn't "reset" anything, its just an old myth. All this does is trick the car into thinking that you are driving in a more spirited fashion by holding down the pedal to the floor with the ignition on, this will just temporarily increase pedal response to adjust.[/QUOTE]

I'm not so sure you are correct on this. My understanding, confirmed by more than one MB Master Tech, is the procedure resets certain transmission adaptation values in the trans control unit. Mercedes (and other manufactures) are required to meet emission and economy numbers. One way they do so is to adapt the transmission shifts points to the optimum rpm for the driving and terrain conditions at which the vehicle is being operated. Note that this is optimum for their requirements, not our performance wishes.
If most of your driving is in urban/slow conditions, performing the RESET OF ADAPTATIONS (NOT REPROGRAMMING), resets the adaptions to a base line, which can temporarily raises shift points and throttle (kick down) responses. and basically make the car more responsive to throttle input. Continue to drive in the same conditions as before, and the transmission control unit will slowly adapt back to where is was. I'm not aware to any issues with the adaption reset, as long as you don't mind a slight decrease in fuel economy. Note that this procedure was more helpful on some earlier year models that really forced up-shift's quicker and restricted kick-down shifts more than what anyone would have desired. Which made the vehicles feel very sluggish.

 

[/QUOTE]
I'm not so sure you are correct on this. My understanding, confirmed by more than one MB Master Tech, is the procedure resets certain transmission adaptation values in the trans control unit. Mercedes (and other manufactures) are required to meet emission and economy numbers. One way they do so is to adapt the transmission shifts points to the optimum rpm for the driving and terrain conditions at which the vehicle is being operated. Note that this is optimum for their requirements, not our performance wishes.
If most of your driving is in urban/slow conditions, performing the RESET OF ADAPTATIONS (NOT REPROGRAMMING), resets the adaptions to a base line, which can temporarily raises shift points and throttle (kick down) responses. and basically make the car more responsive to throttle input. Continue to drive in the same conditions as before, and the transmission control unit will slowly adapt back to where is was. I'm not aware to any issues with the adaption reset, as long as you don't mind a slight decrease in fuel economy. Note that this procedure was more helpful on some earlier year models that really forced up-shift's quicker and restricted kick-down shifts more than what anyone would have desired. Which made the vehicles feel very sluggish.[/QUOTE]

This is a common discussion on this forum. Multiple MB Techs have confirmed that the procedure mentioned in this thread isn't a reset of anything. Yes, new transmission adaptations can be performed by techs but it isn't as simple as turning on the ignition and pressing the gas to the floor lol. The procedure will have to be carried out with a XENTRY unit.

 

This is a common discussion on this forum. Multiple MB Techs have confirmed that the procedure mentioned in this thread isn't a reset of anything. Yes, new transmission adaptations can be performed by techs but it isn't as simple as turning on the ignition and pressing the gas to the floor lol. The procedure will have to be carried out with a XENTRY unit.

 

There are also some scanners that allows reset or adaptation but it might not be the same to Xentry.

 

What do you mean by " reprogrammed by the owner"
if you mean "adaptation reset" then this is NOT reprogramming