GM Service Manual Online
For 1990-2009 cars only

Disconnecting the battery and/or the module's connectors will not clear a DTC. Use one of the two following methods in order to erase the DTCs in the EBCM memory:

    • The scan tool method
    • The module will automatically clear a DTC if the malfunction has not occurred within a predetermined number of ignition or drive cycles depending on the module. Refer to the appropriate module's section for specifications.

Scan Tool Method

Use the following procedure in order to clear the DTCs with the scan tool:

  1. Select DTCs for diagnostic trouble codes.
  2. View the DTCs.
  3. The scan tool will display the following message: History Data Will Be Lost. Clear DTCs?
  4. Answer YES.

    This action will clear the DTCs.

Clear any history DTC after a system malfunction is corrected in order to prevent future misdiagnosis.