Traction Control System Active - 91
WARNING: This page is about a different car, the 2005 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the TRACTION CONTROL SYSTEM ACTIVE - 91 message in the DIC when the electronic brake control module (EBCM) detects that the traction control system is active. The IPC receives a class 2 message from the EBCM requesting illumination.