Conditions for Clearing the MIL/DTC

A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The PCM receives the clear code command from the scan tool.

Fig 1: DTC P1189 (1 Of 2)
Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P1189 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.