Circuit/System Description
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
The hybrid powertrain control module continuously monitors the system voltage on the Ignition voltage circuits. The hybrid powertrain control module is located within the drive motor generator power inverter module and is not serviced separately. Lower than normal voltage may be inadequate to operate the control module or sensors properly.