With Scan Tool
Be sure to verify proper system operation and absence of DTCs when the clearing procedure is completed.
The EBCM will not permit DTC clearing until all DTCs have been displayed. Also, DTCs 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 DTCs have been viewed completely, Tech 1 will ask, "CLEAR DTCs?"; answer "YES." Tech 1 will then -read, "HISTORY DATA WILL BE LOST. CLEAR DTCs?" Answer "YES" and DTCs will be cleared.