2003 Cadillac CTS Owner's Manual - Page 186

Service Idle Control This symbol appears with the Service Idle Control message. Service Stability Sys Message This symbol appears with the Service Stability System message. A problem with the idle control has occurred when this message displays. Have your vehicle serviced by your dealership. Your vehicle may be equipped with a vehicle stability enhancement system called Stabilitrak. See "Stabilitrak" in the Index. The Service Stability Sys message will be displayed if there has been a problem detected with Stabilitrak (if equipped). If the Service Stability Sys message comes on while you are driving, pull off the road as soon as possible and stop carefully. Try resetting the system by turning the ignition off then back on. If the Service Stability Sys message still stays on or comes back on again while you are driving, your vehicle needs service. Have the Stabilitrak system inspected as soon as possible. 2-118