Hello I got 2015 Mercedes E63s amg. I was driving nicely turned off the car. I come back car refused to go into gear. I got the code on the vgs (y3/8n4) is U042600: The start enable signal was not issued by ‘drive authorization system’. I have access to xentry offline (no coding) and a nice launch pad v scan tool with some coding. I also attached a live data line from xentry in the drive authorization section I assume the red NO should be a YES like xentry specified. I also changed my CAN signal distribution box (x30/21). I measured voltage from back probing the CAN box as well got good voltage for CAN high and low all around the box. My launch had a small option to teach in the drive authorization on the vgs but when I click on it says no communication but every other teach in process in the transmission does work and proceeds. I don’t know what to do? Any ideas?

 

moved to W212 AMG forum...

 

this is a W212 amg sorry I didn’t clarify!

 

updated

 

The drive authorization fails...it can be many items:

1. Fob
2. EIS
3. ISM
4. VGS
5. (no ESL!)
6. ...

-- Can you use your Xentry guided troubleshooting to pin point what actively acting up ??

-- You are showing 12.0V: low voltage impact unstable modules networking.

Charge up battery + reboot chassis fresh + clear faults.

Report progress.