There are no ECM hoses. The ECM is the Electronic Control Module.
It's programmed into the engine ECM.
The Hyundai Dealership may have to "flash" the new BCM. They generally charge one hour labor for this service.
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just above the fuse box behind the dash at the driver footwell
It's programmed into the engine ECM. It's not a physical object which can be removed.
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It's programmed into the ECM. You'd have to get a computer with the appropriate software for the engine and the connection, and change the ECM settings. If it's a company truck, you can expect the ECM to be password protected.
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It's an ECM setting. You would need to change the settings in the ECM.
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