Did you synchronize both engine and transmission log windows to each other. There is a selection box on the transmission display window labeled " Sync' . It's just to the right of the record number scroll bar. Click that box and it will sync the transmission data log window to the engine data log window. The DTC 21 displaying in the tranny log s/b the engine DTC, it's displayed there because the DTC 21 will put the tranny into safe mode.
After clicking sync, the time of day box above the record number s/b within a second and the log time XXX.XXX s/b within thousandths of a second of the engine window.
If DTC 21 does not display on engine log window after syncing the logs, then I'm at a loss. Would have to be something fluky w/Datamaster or the PCM scanning out the wrong data or Datamaster analysis of the scanned data.
After clicking sync, the time of day box above the record number s/b within a second and the log time XXX.XXX s/b within thousandths of a second of the engine window.
If DTC 21 does not display on engine log window after syncing the logs, then I'm at a loss. Would have to be something fluky w/Datamaster or the PCM scanning out the wrong data or Datamaster analysis of the scanned data.