What kind of ATF fluid did you use? And how much did you pour in there? How did you check the level? You could have just over filled it and that may cause the limp mode to prevent damage to your transmission. You should read some of the posts on ATF fluid replacement.

Also did you unplug the 13 pin connector and look inside? If you see any fluid in there I’d say replace it.

Good luck

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98 E320 175,600m
99 ML320 175,500m
as of 12/2012