Conditions for Clearing the MIL/DTC

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

Fig 1: Diagnostic Check - DTC P0654 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Diagnostic Check - DTC P0654 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.