2005 Cadillac CTS Owner's Manual - Page 170

If the light still stays on or comes back on again while you are driving, your vehicle needs service. Have the traction control system inspected as soon as possible. See Traction Control System (TCS) (CTS) on page 4-8 or Traction Control System (TCS) (CTS-V) on page 4-10 for more information. You should stop the vehicle and turn off the engine as soon as possible to avoid damage to the engine. A warning chime will sound when this light is on, also. See Engine Overheating on page 5-29 and Message Center (CTS-V) on page 3-52 for more information. Engine Coolant Temperature Warning Light (CTS) This light tells you that your engine is very hot. Engine Coolant Temperature Gage This gage shows the engine coolant temperature. If the gage pointer moves into the shaded area, the engine is too hot. This light will come on when you first start the vehicle as a check to let you know that the light is working. It will go out after a few seconds. If the light does not come on, the bulb may be burned out. See your dealer for assistance in changing the bulb. If the light does not go out or if the light comes on and stays on while you are driving, your vehicle may have a problem with the cooling system. That reading means the same thing as the warning light - the engine coolant is very hot. See Engine Overheating on page 5-29. 3-44