Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

A short to ground or a malfunction in the IGN 1 relay control feed circuit is no longer detected by the BCM.
A history DTC B1428 will clear after the modules ignition counter reaches the reset threshold, without a repeat of the malfunction.