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Old Jun 21, 2024 | 07:52 AM
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C300 w205
Gearbox problems ?
Looking for some help with diagnosing this problem I’ve attached below,

When I floor the car it kicks down and revs up as it should but doesn’t change, it just revs itself back down and then goes into gear ?
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Old Jun 21, 2024 | 08:13 AM
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Originally Posted by Glev
Looking for some help with diagnosing this problem I’ve attached below,

When I floor the car it kicks down and revs up as it should but doesn’t change, it just revs itself back down and then goes into gear ?
Uh oh, that is not good, I never heard of this issue on this transmission. What I am also concerned about is that it allowed the car to rev pass redline, that is bad, very bad. Especially if it does it often, plug a scanner in the car that can scan for codes and see what reports back.
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Old Jun 21, 2024 | 08:18 AM
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Something must have gone wrong with the rev limiter as well, I would not drive the car until a scanner is plugged in to determine what went wrong, you might be damaging the engine by revving over the red line so often.
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Old Jun 21, 2024 | 11:27 AM
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C300 w205
Originally Posted by W205C43PFL
Something must have gone wrong with the rev limiter as well, I would not drive the car until a scanner is plugged in to determine what went wrong, you might be damaging the engine by revving over the red line so often.
Have hard the car diagnosed with Mercedes sky scanner and no faults have come back, very concerned
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Old Jun 21, 2024 | 11:45 AM
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Originally Posted by Glev
Have hard the car diagnosed with Mercedes sky scanner and no faults have come back, very concerned
When was the transmission fluid last checked and/or changed? It could be more than one issue, for one the ECU should not allow the vehicle to go past redline. I wonder if the ECU is faulty and is not giving proper instructions to the transmission and the transmission itself is fine.
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Old Jun 21, 2024 | 11:48 AM
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C300 w205
Originally Posted by W205C43PFL
When was the transmission fluid last checked and/or changed? It could be more than one issue, for one the ECU should not allow the vehicle to go past redline. I wonder if the ECU is faulty and is not giving proper instructions to the transmission and the transmission itself is fine.
You could be right, my first thought was that it may be slipping but I’m not to sure on that idea now. Also only does this under load when putting full power to the car from either a stop or slow crawl like in the video
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Old Jun 21, 2024 | 11:51 AM
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Originally Posted by Glev
You could be right, my first thought was that it may be slipping but I’m not to sure on that idea now. Also only does this under load when putting full power to the car from either a stop or slow crawl like in the video
I certainly do not recommend driving it aggressively until this is fixed, over-revving the engine can lead to serious consequence and jeopardize the life of it.

I wonder why there are no codes, they used XENTRY to check for codes, right?
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Old Jun 21, 2024 | 01:09 PM
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C300 w205
Originally Posted by W205C43PFL
I certainly do not recommend driving it aggressively until this is fixed, over-revving the engine can lead to serious consequence and jeopardize the life of it.

I wonder why there are no codes, they used XENTRY to check for codes, right?
Yeh used XENTRY system nothing came up, very strange
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Old Jun 21, 2024 | 01:23 PM
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Originally Posted by Glev
Yeh used XENTRY system nothing came up, very strange
What year is the vehicle, how many miles and when was the transmission fluid last changed.
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Old Jun 21, 2024 | 02:39 PM
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C300 w205
Originally Posted by W205C43PFL
What year is the vehicle, how many miles and when was the transmission fluid last changed.
2016 only 31,000 miles, only had the vehicle for under a month so transmission service is my first step as it’s never had one done
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Old Jun 21, 2024 | 03:13 PM
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Originally Posted by Glev
2016 only 31,000 miles, only had the vehicle for under a month so transmission service is my first step as it’s never had one done
When did this started happening after the transmission fluid flush? Was the transmission fluid done at a Mercedes-Benz dealership or an independent shop?
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Old Jun 23, 2024 | 06:05 AM
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Originally Posted by W205C43PFL
When did this started happening after the transmission fluid flush? Was the transmission fluid done at a Mercedes-Benz dealership or an independent shop?
It hasn’t been done yet it’s booked in for next week
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Old Jun 23, 2024 | 07:14 AM
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Originally Posted by Glev
It hasn’t been done yet it’s booked in for next week
I see, hopefully there are no metal shavings in the fluid, hope it is healthy.
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