BenzWorld Junior Member
Date registered: Oct 2011
Vehicle: 2007 C230 Sport
Location: Cranberry Twp, PA
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2007 C230 Sport shifting problem
I recently purchased a 2007 C230 Sport sedan with 110k miles and have noticed a slight problem with the shifting pattern in the automatic transmission.
Here is the problem:
From stop, I've had no problem getting into 1st gear with a shift around 2500 RPM. In 2nd gear at around 2500 RPM the transmission quickly shifts so that the engine races a bit and the RPMs go from 2500 to 3200 RPM in the matter of a half a second. It almost sounds like the transmission quickly downshifts into 1st and then quickly shifts into 3rd. I've had no problems with hard shifting or grinding of gears. And the problem is more pronounced as you step on the accelerator aggressively.
I took my vehicle to the dealer and was able to replicate the problem with the technician. Since the vehicle had been serviced at this dealer, the service consultant told me that the transmission fluid and filter had been changed only 2,000 miles ago before being sent to auction. They told me that they could not find any error codes in the onboard computer and that there were no additional software updates. They finally recommended that I continue to drive the car as normal and the problem may or may not get worse.
Have any of you experienced a shifting problem like this? I believe that the problem is not with the transmission but rather with the onboard computer (transmission contrul unit - TCU). I spoke with MB Customer Service and they have not heard of a problem like this nor do they have any service bulletins regarding this issue.
Can anyone shed light on this situation? Is the problem simply a bad TCU or a programming issue or is it something more serious like a bad transmission?