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Multiple issues: trany jerking, low rpm at idle, can't autostart after stop

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Old Sep 18, 2025 | 01:35 PM
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2015 c300
Multiple issues: trany jerking, low rpm at idle, can't autostart after stop

Hi,
Would like to get some advice.
2015 c300 rwd. I ran it for 39,000mi. Yeh it's a leisure car.

Recently, it's jerking in changing gears, esp. at d2->d3 (fyi, no tranny fluid changed yet).
And the rpm at idle stays b/w 500~550 so it's shaking intermittently. Sometimes it's almost turned itself off.
And it's not autostarted at a stop one time a few days ago.
No error code found but I am going to put it into the dealership for checking soon.

Any similar experience or advice will be welcomed.
Thank you!
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Old Sep 19, 2025 | 06:36 PM
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2022 E53 AMG
You may get a code soon or there is one already but it does not throw a CEL or a cheap OBD reader will not read the code in the modules.

Until you get a code, it will be hard for anyone to help you with a direction. Hopefully MB can help you find a solution and fix.
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Old Sep 30, 2025 | 05:38 PM
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2015 c300
I burned $297 for inspection and they reported it's a crankshaft position sensor malfunction (P033904).
And they found a cracked rear flex disc.

The estimates are $1400 and $874 each.
Any advice?
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Old Oct 1, 2025 | 05:00 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by sulsj
I burned $297 for inspection and they reported it's a crankshaft position sensor malfunction (P033904).

And they found a cracked rear flex disc.

The estimates are $1400 and $874 each.
Any advice?
I find it really odd that faulty crankshaft CKP did not trigger CEL and not log any fault: near impossible!

If you had said... oily camshaft CPS sensors then yes.
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Old Oct 1, 2025 | 05:27 PM
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2015 c300
Yes, I agree. No warning lights on. Maybe just dirty or oily or not sick enough.
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Old Oct 1, 2025 | 05:35 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by sulsj
Yes, I agree.
No warning lights on.
Maybe just dirty or oily or not sick enough.
Well know more soon enough.
knock on wood.
🤞
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Old Oct 1, 2025 | 09:30 PM
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