2002 Buick Rendezvous DTC U1000

I HAVE THIS DTC, BECAUSE THE OWNER TRY TO CHANGE THE RADIO BUT MAKE A SHORTCUT, THE PCM WAS DAMGED, CHANGE THE PCM BUT IT'S FOR A FWD, AND THIS IS AWD, I HAVE AN ALARM FOR AWD DISABLE IN THE IPC, AND THE DTC U1000, THE OWNER BUY A NEW PCM, I PROGRMED WITH TECH2, WITH THE CARS VIN, AND MAKE THE VTD RELERNED, BUT THE DTC U1000 STILL IN PCM NEW MODULE AN THE ALARM IS IN IPC TOO.
THANKS