Mercedes Benz W203 C-Class C220 CDI whining noise

Question

I have my W203 (Automatic Transmission 722.6) that is killing me with this whining noise when i let the release the gas pedal and the sound change intensity depending on the speed. It starts when decelerating just under 100km/h, it increase until the 50 / 55 km/h and then it goes down again. It stops when i go under 20km/h.

There are no error codes and someone say it can be the GearBox but it costs a lot to repair, someone else say it can be the differential.

automatic transmission differential mercedes benz noise

There are no error codes and someone say it can be the GearBox but it costs a lot to repair, someone else say it can be the differential.

Richard Abbott · Answer

What I would do is try and identify were the noise is coming from. This might work. Jack up the drive wheels,run the engine and with a long steel 1/4 rod with a wooden bung on the end touch each part of the engine, gear box,diff,wheel hubs,etc., with the bung on your ear. That would tell you if a bearing was suspect. This system is used to ident leaking water pipes in in the ground even today. It is great fun when you hit the right area. 6MM x 1m screwed rod can be got from diy outlets. Good luck.

Answered by Richard Abbott on December 23, 2020

Mercedes Benz W203 C-Class C220 CDI whining noise

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