Engine Traction System Indicator
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.
TRAC OFF
The instrument panel cluster (IPC) illuminates the TRAC OFF indicator when the electronic brake control module (EBCM) inhibits the Engine Traction System due to a malfunction in the Engine Traction System. The IPC receives a GMLAN message from the EBCM requesting illumination.