Low TRAC
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the LOW TRAC indicator when the Electronic Brake Control Module (EBCM) detects a traction control event. The IPC receives a class 2 message from the EBCM requesting illumination.