Service Bulletins
Service Bulletins give additional technical service information needed to knowledgeably service General Motors cars and trucks.
Each bulletin contains instructions to assist in the diagnosis and service of the vehicle.
See also:
XM Messages
XL (Explicit Language
Channels): These channels, or any others, can be blocked by request, by
calling 1-800-929-2100 in the U.S. and 1-877-438-9677 in Canada.
XM Updating: The encryption code i ...
Transmission Messages
SERVICE TRANSMISSION
This message displays if there is a problem with the transmission.
See your dealer.
SHIFT DENIED
This message displays when using the Driver Shift Control (DSC) and
a ...
Exterior
The ATS' narrower headlights represent the closest interpretation yet of the
slit-like lamps on Cadillac's Ciel and Converj concepts shown in 2011 and 2009,
respectively. The protruding nose with ...






