Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) or body control module (BCM) diagnoses a condition preventing the engine control portion of the traction control function and sends a class 2 serial data message to the EBCM indicating that torque reduction is not allowed. The ECM or BCM will typically set a DTC and the EBCM will set DTC C0561.