DTC C1278: TCS Temporarily Inhibited By Pcm: Notes
WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
This code is for information only. As an aid to the technician, this code indicates that there are no problems in the ABS/ETS/TCS system. Any further references for diagnostic information should be taken from Engine Controls.