Selecting Clear Codes

Selecting "CLEAR CODES?" test will result in "CODES CLEAR" message being displayed with selected system name for 3 seconds, indicating all stored DTCs have been erased from memory. After 3 seconds, display will automatically return to next available test type level. After a DTC has been cleared, make a complete ignition cycle and test drive vehicle (if possible). Ensure DTCs do not reset.

Fig 1: Performing Basic Diagnostic Procedures

Courtesy of GENERAL MOTORS CORP.

Fig 2: PZM Service Mode Chart

Courtesy of GENERAL MOTORS CORP.