With Scan Tool

Be sure to verify proper system operation and absence of codes when the clearing procedure is completed.

The EBCM will not permit code clearing until all codes have been displayed. Also, codes cannot be cleared by unplugging the EBCM, disconnecting the battery cables, or turning the ignition "OFF" (except on an ignition cycle default).

Tech 1 Method
Select F2 for diagnostic trouble codes. After codes have been viewed completely, Tech 1 will ask, "CLEAR CODES"?; answer "YES." Tech 1 will then read, "HISTORY DATA WILL BE LOST. CLEAR CODES"? Answer "YES" and codes will be cleared.