CACT : TCM Communication Error

Insert a software upgrade token into the ADM and cycle the power.  Make certain to wait until the upload is complete before removing the token.  For more information on loading software, refer to the module programming manual by searching for "3A1244" at

  • Green light on each module should be lit.  If green light is not lit, check to make sure each CAN cable connection is not cross threaded and is tight.
  • Verify the power supply is outputting 24 V dc.  If not, check power supply wiring.  If wiring is okay, replace the power supply.