2021 Mercedes-Benz AMG GT Digital Extras Activation Issue
After replacing the HERMES or RAMSES telematics control unit in your 2021 Mercedes-Benz AMG GT, you might find Digital Extras (Mercedes me) cannot be activated, accompanied by DTC B15CE00 and messages like 'SOS - service not activated'. This TSB explains the cause and remedy.
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:
| Code | Description |
|---|---|
| B15CE00 | Active or active+saved |
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
Frequently Asked Questions
- What is the main issue described in TSB L182.85-P-078473?
- TSB L182.85-P-078473 addresses a problem where Digital Extras (Mercedes me) services cannot be activated in a 2021 Mercedes-Benz AMG GT after the N112/9 (HERMES) or N112/2 (RAMSES) telematics control unit has been replaced.
- What fault code is associated with the 2021 Mercedes-Benz AMG GT Digital Extras activation issue?
- The primary diagnostic trouble code (DTC) associated with the Digital Extras activation issue is B15CE00, which indicates a problem with the telematics service activation.
- What messages might I see if my Digital Extras are not activating?
- You might see 'SOS - service not activated' in the instrument cluster, 'Error when replacing certificate (CEP.36)' in the activation status, or log errors like 'CEP Invalid VIN/UniqueID combination' or 'CEP_VIN_UNIQUEID_INVALID'.
- What should I do if my Mercedes-Benz AMG GT Digital Extras are not activating?
- You should contact your authorized Mercedes-Benz dealership and inform them about the issue, referencing TSB L182.85-P-078473. They will create a TIPS case to investigate and resolve the problem.
- Are safety features like emergency call affected by this issue?
- No, the TSB explicitly states that the emergency call function is not impaired, even if the Digital Extras services are not activating correctly.
Other revisions of this TSB
What Mercedes-Benz AMG GT owners report
Counted from the records in our database across 11 model years.
- 36
- Owner complaints
- 39
- Recalls
- 426
- Service bulletins
- 0
- Crashes reported
- 1
- Fires reported
- 0
- Injuries reported
The 2021 model year
3 complaints, the 5th most of 11 model years on file. Owners reported 0 crashes, 0 fires and 0 injuries for this year, which also has 12 recalls on file.
Electrical System, the system this article covers, accounts for 8 of 36 complaints (22%), including 2 for 2021.
Complaints by model year
| 2016 | 10 | |
|---|---|---|
| 2018 | 2 | |
| 2019 | 6 | |
| 2020 | 5 | |
| 2021 | 3 | |
| 2022 | 2 | |
| 2023 | 3 | |
| 2024 | 1 | |
| 2025 | 1 | |
| 2026 | 2 |
Most-reported systems
- Electrical System — 8
- Power Train — 8
- Engine — 4
- Service Brakes — 4
- Wheels — 4
Latest recalls for the 2021 model year
- 24V445000 — Electrical System (Jun 2024)
- 24V100000 — Electrical System (Feb 2024)
- 23V880000 — Fuel System, Gasoline (Dec 2023)
Recent owner reports about electrical system
Read owner complaints →The contact owns a 2021 Mercedes-Benz AMG GT53. The contact received notification of NHTSA Campaign Number: 24V445000 (ELECTRICAL SYSTEM); however, the part to do the recall repair was not yet available. The local dealer was contacted.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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