Do EBCM's need to be flashed? I swapped one from our other 2001 Blazer last year. It had previously been rebuilt by Module Masters and has worked the ABS normal on both Blazers. I do have an issue with 4x4 engaging front axle by itself through and want to be sure the ABS doesn't need flashed before I try to solve the 4X4 problem.

Thanks Blazeme