Faulty Keyless Go - W212 (Not low batt)

[Voodooman]

Anyone has encountered the below:

a.  Unable to unlock and lock my 2015 W212 with my Keyless Go, need to do it via the smartkey button on the key fob.

b.  Unable to start engine using the start-stop button. Need to insert and turn the key fob to start and switch off engine.

Tried replacing the battery on the key fob and my car battery is also new (less than 6 months old), didn't work.  I googled, potentially a code issue.  Called C&C and they said they might need to refresh the code and it will cost me in excess of $300 and it will take 1 day.     

 

Anyone with same issue and a quicker and cheaper fix?

 

 

[Angchug]

I had similar issue with my W205. Just like you I tried changed all the battery but in vain. I struggled for 3 days. 

Here is the trick.( saw how it was done ) 

Stand beside the driver's side door with your key. 

Press the door handle than open the door. For some unknown reason everything will be back to normal. 

 

[Voodooman]

Thanks for sharing. Didn't work for me. I recalled having the occasional key not detected messages before this came by.  Read that it could be due to a fuse issue as well.  Good that this does not appear to be a common Mercy problem.

[Angchug]

Call Vincent 96185133. He did mine. He got the scanner and diagnostic kit.