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Software Calibration number coding, short for SCN coding is intrudes by around 2005. It replaced the previous coding technique with a centralized and almost automated technique to prevent incorrect coding being selected when replacing a module.
1) Check engine light on
2) Transmission gets stuck in 1 gear. If your have trouble with transmission, there is a good chance that the problem is with you ME control unit and that SCN coding is needed to resolve the issue.
3) Turn the engine and it on again
SCN coding is required for a number of reasons. First of all, it is required by law; you may also be fined if you have not performed this crucial step. Secondly, 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.
Here are some of the things that happen when you need SCN coding. 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.
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 authorized 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.