2021 Mercedes-Benz AMG GT Digital Extras Activation Issue

Symptoms

Owners of a 2021 Mercedes-Benz AMG GT may experience issues with their Digital Extras (previously Mercedes me) services not activating after the replacement of a telematics control unit. This problem can manifest with several specific messages and behaviors:

• The instrument cluster may display the message "SOS - service not activated". This message remains permanently lit, indicating a persistent issue with the telematics system.
• In the actual values for the activation status under "Registration status", the system may show "Error when replacing certificate (CEP.36)". This indicates a problem with the certificate required for service activation.
• The control unit log for the N112/9 (HERMES) or N112/2 (RAMSES) telematics unit might record a registration error such as "CEP Invalid VIN/UniqueID combination" or "CEP_VIN_UNIQUEID_INVALID". These errors point to a mismatch or invalidity in the vehicle identification or unique ID during the certificate exchange process.
• General symptoms include the telematics service being unable to activate or deactivate, or showing no connection at all.

Fault Codes / DTCs

The primary diagnostic trouble code (DTC) associated with this issue is:

This DTC indicates a problem with the activation of the Digital Extras services.

Diagnosis / Trigger Conditions

This issue specifically occurs after the replacement of the N112/9 control unit for telematics services (HERMES) or the N112/2 control unit for telematics services (RAMSES). The problem arises when the new control unit's data is not properly updated in the back-end system.

Cause of the Problem

The root cause is identified as sporadic problems in the back-end system. When a new telematics control unit is installed, data from this unit may not be updated correctly in the Mercedes-Benz back-end infrastructure. This prevents the necessary certificates and registration details from being processed, leading to the inability to activate Digital Extras.

Important Warnings

Owners should be aware that despite the issues with Digital Extras and Mercedes me services, the emergency call function of the vehicle is not impaired. This critical safety feature remains operational.

Remedy / Repair Procedure Summary

If your 2021 Mercedes-Benz AMG GT is experiencing this issue, the recommended action is to create a TIPS case. Mercedes-Benz notes that in some instances, the problem may rectify itself over time without further intervention. However, initiating a TIPS case ensures the issue is officially documented and can be tracked for resolution.

Owner Action / What to Do

If you encounter any of the described symptoms with your Mercedes-Benz AMG GT Digital Extras, especially after a telematics control unit replacement, contact your authorized Mercedes-Benz dealership. Inform them about the issue and reference Technical Service Bulletin L182.85-P-078473. They will be able to create a TIPS case to address the activation problem.

Source: NHTSA ID 11008880