Problem with the W207 CAN Bus

[adrianek69]

Your symptoms and error codes are very consistent with a power supply/terminal 15 issue, rather than a complete failure of the CAN backbone. The car still starts and runs most of the time, which is typical when the problem is on the ignition side (15/15R), rather than in the constant power supply or the EIS unit itself.

 

[Nages]

Do you have access to a scanner/XENTRY? If so, you can check the drive authorization status every time you insert the key.

Alternatively, if you have an inexpensive key reader with an indicator, you can use it to check whether you have a problem with the EIS or the key.

If the indicator lights up when you insert the key, the EIS is OK, if the indicator lights up continuously when you turn the key, the key is OK.
If the indicator doesn't light up every time you insert the key into the EIS, there's a problem with the EIS; if the indicator goes out after being on, there's a problem with the key.

I also recommend clearing all errors and using a spare key to see if the problem returns.

I recently had similar terminal error codes 15 and random communication codes, which ended up being related to the key. Not the same model as yours.

 

[Sandip]

I solved a similar problem on a W207.402 E220 CDI, let me know if you still haven't succeeded, I'll be happy to help.