R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

2006 R350 Transmission wont engage

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Old Sep 6, 2016 | 09:52 AM
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2006 R350
2006 R350 Transmission wont engage

Driving home from the store the other day and when I pulled out onto the main road my transmission would not shift out of 1st gear. When I went to pull into a parking lot to get off the main road the transmission dis-engaged completely. I shut off the vehicle, turned it back on engine was good, shifted into drive (showed 'D') on the instrument panel, heard the click come from underneath so it sounded fine, but nothing. when the gas pedal is pressed the engine revs but the tranny is just not engaging.

Plugged in a basic OBD II and got P0722 and another cam shaft timing code.

ESP, SRS and ABS lights are on.

Any thoughts!?!?

Please help!!!!
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Old Sep 6, 2016 | 11:44 AM
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2006 R350
I was able to get the code removed, check engine light off but the car still wont move. Shifter shows 'D' and 'R' when put in each, I can hear something happening under the vehicle when I do switch, but the car won't move. Engine revs when gas pedal pushed, transmission isn't engaging at all. Error code has not returned, but since the vehicle isn't moving maybe that is the reason.
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Old Sep 6, 2016 | 01:44 PM
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If I get my hands on a proper diagnostic tool, is it possible to clear the TCU issue so that I may drive the vehicle? Obviously directly to a mechanic, just don't want to tow it in if I don't have to.
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Old Sep 6, 2016 | 03:03 PM
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Perfect, I agree. But to clarify, the proper diagnostic tool does have the ability to clear the MB code and allow the tranny to start working again?
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Old Sep 6, 2016 | 11:39 PM
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Originally Posted by sedge11
Perfect, I agree. But to clarify, the proper diagnostic tool does have the ability to clear the MB code and allow the tranny to start working again?
No, you may have mechanically broken the transmission. Even if you are able to clear it and drive it i would not. There is obviously something wrong with it, driving it may cause more damage to an expensive transmission all to save on a $100 tow bill.

We do transmissions, it doesnt sound like a issue thats electrical or that clearing codes is going to make it movable.
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Old Sep 6, 2016 | 11:44 PM
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Went through this nightmare with a R500, ended up getting a rebuilt transmission 3/36K warranty. It started as a skip from 1st to 2nd gear, I stopped driving it, took over to the shop to get the diagnostic done and transmission guys there looked into it.
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Old Sep 7, 2016 | 08:37 AM
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2006 R350
Thanks all for your input. I am trying to get my hands on a more detailed MB code reader, I'll post results and get everyone's input once I do.
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Old Sep 8, 2016 | 11:51 AM
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Old Jan 12, 2020 | 09:06 PM
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2006 r350
r350 transmission problem

having the same problem how did u straighten it out
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