No the module is not faulty and won't need replacing. We had the same issues using launch. The problems seem to arise when the pad change is slow and the modules within the car go to sleep mode during the change.
Hook up your Delphi again clear any faults from the parking brake module and then (what we do) entre service mode first then exit service mode and they should close.
We found it only worked when we tried to put the module in service mode before closing although it already was in service mode. Perhaps something in the software of the tool.
Good luck.
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