Detector for Db2 for z/OS (PDT) PDTDSCPY job failed with return code of 8 without any error message.
There could be many reasons for this kind of behavior but for this case the failing job was missing the hlq.CDBALOAD in the job STEPLIB as seen below:
Failed STEPLIB:
//STEPLIB DD DISP=SHR,DSN=hlq.DSNLOAD
Good STEPLIB:
//STEPLIB DD DISP=SHR,DSN=hlq.DSNLOAD
// DD DISP=SHR,DSN=hlq.CDBALOAD