Action Taken When the DTCs Sets

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

The module suspends all message transmission.
The module uses default values for all parameters received on the serial data circuits.
In the TCM, DTC U0073 will cause the transmission to go into default gears.
In the ECM and TCM, DTC U0073 will cause the malfunction indicator lamp (MIL) to illuminate.
The module inhibits the setting of all other communication DTCs.