Diagnostic Aids
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The scan tool Exhaust Heat Exchanger Exhaust Bypass Valve Position Learn Status parameter display is only valid between the initial ignition key-ON learn event and the first Autostop event. After an Autostop, the status transitions to Unlearned for the remainder of the ignition key cycle.