Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 40 malfunction free warm-up cycles.
The PCM receives the clear code command from the scan tool.

Fig 1: DTC P1189 Diagnosis Procedure (1 Of 2)

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Fig 2: DTC P1189 Diagnosis Procedure (2 Of 2)

Courtesy of GENERAL MOTORS CORP.