Why you need SCN Coding?

XENTRY Diagnosis VCI

Mercedes Benz Software Calibration Number SCN Coding

Why is SCN coding important?

Because if you are experiencing trouble with your transmission, there is a good chance that the problem is with your ME Control Unit and that SCN coding is needed to resolve the issue. Unauthorised technicians can not fix this problem because only certified technicians can access the Mercedes-Benz server.

SCN coding is required to update the software when a new Electronic Transmission Controller (ETC) or fuel control unit (ME) is installed. In a majority of the systems in Mercedes Benz, SCN coding is required after the replacement. These systems include

  • SRS airbag computer
  • 722.9 gearbox computer replacement
  • Gearbox module
  • SAM computer
  • ABS
  • ESP control unit
  • the COMAND system
  • intelligent headlight computer instrumentation
  • Keys programming
  • ME modules and more …
  • All these systems require the network authorisation from the Mercedes-Benz Technical Service Center for the completion of the process. Unauthorised technicians can’t do this.

Why SCN Coding Services Are Needed

SCN coding is required for a number of reasons.

  1. it is required by law; you may also be fined if you have not performed this crucial step.
  2. you need this if you want to make sure that your vehicle works at optimal levels. SCN coding is also required to prevent any aftermarket enhancements that are done to improve the performance. If you want to install additional control module in the future, it will require SCN coding.

For example for 722.9 gear box computer replace, First of all you check engine light will be on. You may notice that your transmission gets stuck in a 1 gear. If you turn the engine off then on again, this may resolve the problem, but only temporarily, then the same thing happens again. You may also feel a kick when you shift into drive or reverse. Any of these could be signs that your Mercedes needs SCN coding.

How SCN Coding Works?

The repair process of the ME control unit requires the technician to update the software in order to solve the real issue. Now, to update and correct the software programming, you need to re-code it with the help of SCN Coding. To repair the ME control unit two steps are required; flashing and updating the software by using the Software Calibration Number (SCN). However, most independent Mercedes Benz service shops cannot perform this process of updating Mercedes Benz ME control unit SCN because only the authorised technicians can access Mercedes-Benz server.

Why flashing is required in the updating process of Mercedes Benz ME control unit software? In simpler terms, flashing is a method to update the ME control unit software. Flashing would be required in many circumstances; for instance, in cases when your DTB requires the software to be updated, when TAC/EDAC requested the updated software, if there is any part with new ECU number or when a new Mercedes Benz ME control unit is identified by SCN.

What needed for SCN Coding?

  1. Original OEM Xentry VCI (since 10/2021 ONLY Original VCI)
  2. Xentry Diagnostic System
  3. Mercedes SCN coding remote support
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