The EBCM/EBTCM performs system self-diagnostics, and can detect and often isolate system malfunctions. When a malfunction is detected, the EBCM/EBTCM sets a Diagnostic Trouble Code (DTC). The DTC represents the malfunction, turns on the Antilock and/or Traction Control indicators (in almost all instances if equipped), and may disable the ABS/TCS functions as necessary for the duration of the ignition cycle.