Conditions for Clearing the DTC

The history DTC clears after 100 malfunction free warm-up cycles.
The DTC becomes history when the conditions for setting the DTC are no longer present.
The IPC receives the clear code command from the scan tool.

Fig 1: DTC B0540 (Steps 1-4)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC B0540 (Steps 5-9)

Courtesy of GENERAL MOTORS CORP.