2008 C300 Auto Transmission Question - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 05-15-2013, 07:56 AM Thread Starter
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2008 C300 Auto Transmission Question

Gentlemen, I purchased a used 2008 C300 a few mos ago. I enjoy the car and my wife loves it! My question centers around the operation of the automatic transmission. Unlike any other vehicle I have driven the trans in this car always wants to downshift instead of "coast", especially when traveling downhill. In other words when I let off the accelerator in anticipation of a stop ahead instead of the trans coasting up to the light in the highest gear, the trans is continually downshifting as the vehicle road speed slows. This serves to "hold back" the car, just as if I had downshifted a manual trans. Is this the correct operation of the trans in this vehicle or should the trans operate like most other cars and remain in "high" gear when coasting only to downshift when stopped or accelerated?
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post #2 of 3 (permalink) Old 05-16-2013, 02:07 PM Thread Starter
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I guess I asked a pretty tough question. Over 100 views and no responses. Let me rephrase. Does your transmission downshift as you slow the vehicle? I.e.; if you're going 50mph and let off the gas will the trans downshift from 6th to 5th at 40mph then DS to 4th at 30 mph...etc. or will the trans remain in 6th, allowing the car to coast, untill coming to a stop? Thanks.
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post #3 of 3 (permalink) Old 10-13-2013, 06:30 AM
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Yes, it does downshift

Well, sorry for the very late reply. I just read this thread this morning.

My 2009 C300 does this exactly as you described. I am not a techie or MB rep, but I believe this is on purpose. With a computer controlled car, it just made sense to me. I never questioned it--I just thought, " Brilliant."
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