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ECU language is not like your computer programming language. ECU programming is called Machine Language. An Electronic Control Unit has an Embedded Programming System in-car electronics comprised of many memory chips and microprocessors. These memory chips keep the car data safe to run the system accordingly. The Vehicle Identity Number (VIN) has 17 digits, and it is the vehicle's ID. When you unlock the car with the remote control or turn on the car ignition switch, the ECU reads the fed VIN; if the VIN is not the same, it refuses the car starting order. It passes the information through the Controller Area Network (CAN Bus) to all the controllers and the sub-controllers of the vehicle. Like VIN, there are other many CODES saved in the microchips. If these codes vanish from the chips, the car will refuse to start or bring faults.

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The process to recode the car calls programming. Embedded Programming is quite sensitive and technical because you have to remove the memory chips from the circuit board like ECU Repairing or testing ECU Circuit Board. And then, using Embedded Programmers, we take the data from the controllers, and we edit the data using different editors, as you can see in the above picture. 
 

We programme the different memory chips and resolder them back in the circuit board; Embedded Programming cannot perform using OBDII. There are some car programmers like KTAG and KESS, but still, you need to edit the files. I have noticed that some companies are selling edited files, but it's better to learn how to edit them yourself. 
 

Car Scanners that you have seen in the mechanical workshops are only scanners. The OEM (Original Equipment Manufacturer) Scanners and Programmers are available; usually, car dealers use them. These are capable of programming the NEW (VIRGIN) ECUs using the manufacturers' online PORTALS, but it will cost you a fortune. ECU programming using the Portals require an expensive yearly subscription to use the service. It is not affordable for DIY lovers. Also, the manufacturers don't allow individuals to use their Portals. They require at least level seven qualification plus their three months of expensive training, and you cannot use aftermarket programmers. 
 

Some quality scanner if updated, like AUTEL MAXISYS PRO SMART has the capability of OBDII programming, you cannot also connect to some car manufacturers. Still, then again, you have minimal access to the programming.

 

Embedded Programming is an entirely different technique using Embedded Programmers without using any Portal, but you have to learn to engineer.

We Auto Electrician Hayes offers all kinds of cars' all electronics' programming and coding with reasonable prices with a warranty. 

The process to recode the car calls programming. Embedded Programming is quite sensitive and technical because you have to remove the memory chips from the circuit board. And then, using Embedded Programmers, we take the data from the controllers, and we edit the data using different editors, as you can see in the above picture. 
We programme the different memory chips and resolder them back in the circuit board; Embedded Programming cannot perform using OBDII. There are some car programmers like KTAG and KESS, but still, you need to edit the files. I have noticed that some companies are selling edited files, but it's better to learn how to edit them yourself. 
Car Scanners that you have seen in the mechanical workshops are only scanners. The OEM (Original Equipment Manufacturer) Scanners and Programmers are available; usually, car dealers use them. These are capable of programming the NEW (VIRGIN) ECUs using the manufacturers' online PORTALS, but it will cost you a fortune. ECU programming using the Portals require an expensive yearly subscription to use the service. It is not affordable for DIY lovers. Also, the manufacturers don't allow individuals to use their Portals. They require at least level seven qualification plus their three months of expensive training, and you cannot use aftermarket programmers. 
Some quality scanner if updated,  like AUTEL MAXISYS PRO SMART has the capability of OBDII programming, you cannot also connect to some car manufacturers. Still, then again, you have minimal access to the programming.

Embedded Programming is an entirely different technique using Embedded Programmers without using any Portal, but you have to learn then to engineer.
We Auto Electrician Hayes offers all kinds of cars' all electronics' programming and coding with reasonable prices with a warranty.