Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) detects a fault preventing the engine traction control and sends a serial data message to the EBCM indicating that torque reduction is not allowed.