New module won’t talk?
You may notice that after an EBCM replacement that you have no communication with the ABS system, further complicating diagnosis. This is likely due to no operating system software installed in the EBCM from the supplier. DTC U0121 may or may not be set.
Program the module via SPS before continuing with any diagnostics, as the EBCM needs to have the operating system loaded before it will start to communicate with the Tech2. Please follow the diagnostic or repair process thoroughly and complete each step.