When to Perform the Procedure
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Failure to perform this procedure may result in poor system performance, DTCs being set, or customer dissatisfaction.
Perform this procedure when the following component has been serviced: B9 Ambient Air Temperature Sensoror K20 Engine Control Module or Battery - Replaced