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Mercedes Comand Navi repair

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COMAND repair: Identify error pattern and system

Is your Mercedes navigation system constantly restarting, stuck at the logo, or showing “Bootloader active”? ProDiag Bremen offers repairs for NTG 4.5, 5.1, 5/5.2, 5.5, and 6. The appropriate service depends on the installed device and the error pattern.

Select your system below and compare the described symptoms. If you do not know the NTG version, send us an inquiry with the FIN and a description of the error. The model series alone is not enough for a reliable identification.

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Go directly to the matching system

NTG 6 · NTG 5.5 · NTG 5 / 5.2 · NTG 5.1 · NTG 4.5

Repair or map update?

In the event of restarts, a black screen, or a canceled update, the cause should be clarified first. If the device is working and you only need newer map material, you can find the offers under Mercedes Navi Update.

This information helps with your inquiry

Please provide the 17-digit FIN, the NTG version (if known), and the exact message on the screen. Describe when the error first occurred and whether an update or repair attempt was made previously.

You can send a photo of the message via WhatsApp by arrangement. To request a repair, please use the form on this page.

Mercedes Comand NTG 6

Typical error patterns:

  • Bootloader mode active
  • Device only shows the Mercedes-Benz logo
  • Constant restart
  • EU map or navigation cannot be loaded
  • “Radio is activated…” without success
  • No picture / black screen
  • Update stops at the logo
  • Change region to ECE
  • Navigation is not activated
  • Theft mode active
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Mercedes Comand NTG 5.5

Typical error patterns:

  • “Bootloader active”
  • Device does not respond
  • Digital operating instructions in the wrong language
  • Constant restarts
  • Card is not loaded
  • Navigation update stops at e.g. 82%
  • Map update fails / is canceled
  • Apple Carplay does not start
  • Change region to ECE incl. EU map material & radio frequencies
To the product
Request repair

Mercedes Comand NTG 5.2/5

Typical error patterns:

  • “Bootloader active”

  • Device constantly restarts

  • Fan runs permanently at full volume

  • Display in Japanese language → Conversion to ECE version

  • Black screen / no picture

  • CD/DVD drive or changer does not work

  • Navigation not enabled

  • Digital operating instructions missing

  • Theft protection active

To the product
Request repair

Mercedes Comand NTG 5.1

Typical error patterns:

  • No FM stations / radio not available
  • Device does not start
  • Only the fan is running
  • Navigation not available
  • Navigation data error
  • Change region from any to ECE incl. maps & frequencies
To the product
Request repair

Mercedes Comand NTG 4.5

Typical error patterns:

  • Bootloader mode active
  • Device constantly restarts
  • Chinese characters → Change region to ECE
  • Navigationsupdate hangs or fails
To the product
Request repair

Comand Navi repair in the ProDiag Bremen online store

In our COMAND repair category, you will find repair offers sorted by NTG version. The price displayed depends on the selected service.

Please only select a repair once the system and error pattern have been identified. If several symptoms occur or the cause is unclear, please inquire before ordering.

To the Shop

Comand Navi repair inquiry form

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Comand/NTG version
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Error description / notes
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Previous repair attempts? *
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Navi update requested? *
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We use your details to respond to your enquiry. Information on how we handle your data and your rights is available in our privacy policy.

Costs & process for Comand repair

Repair costs depend on the NTG version and error pattern. You can see the current price for a specific service after selecting it in the respective repair product.

If the cause is unknown, there are multiple errors, or repair attempts have already been made, we will first clarify the scope based on your inquiry. Describe the behavior of the device as accurately as possible and provide the FIN.

Request
  1. Identify system and error: Select the appropriate offer or send us your inquiry in advance.
  2. Ordering and shipping: After ordering online and providing the required information, send us the defective device for repair in Verden near Bremen.
  3. Inspection and repair: We analyze the error, carry out the agreed repair, and test the device. The specified processing time is usually 1–2 working days; we will coordinate the process with you for special error patterns.
  4. Return shipping: After a successful repair, we send the device back for reinstallation. Shipping times are in addition to the processing time.
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