2011 Chevrolet Volt Owner's Manual - Page 146

5-26 Instruments and Controls If the ABS warning light remains on after resetting the system or comes on again while driving, the vehicle needs service. If the ABS warning light is on, but the regular brake system warning light is not on, the antilock brakes are not working properly, but the regular brakes are still functioning. Have the vehicle serviced right away. If both brake lights are on, the vehicle does not have antilock brakes, and there is a problem with the regular brakes as well. Have the vehicle towed for service. See Towing the Vehicle on page 10‑84. Antilock Brake System (ABS) Warning Light Sport Mode Light This light should come on briefly when the vehicle is in ON/RUN. If it does not come on, have the vehicle serviced by your dealer. If the ABS warning light stays on longer than a few seconds after the vehicle is in ON/RUN, or comes on and stays on while driving, try resetting the system. To reset the system: 1. While driving, pull over when it is safe to do so. 2. Place the vehicle in P (Park). 3. Turn the vehicle off. 4. Restart the vehicle. This light comes on when Sport Mode is selected. See "Sport Mode" in Driver Selected Operating Modes on page 9‑26 for more information. Mountain Mode Light This light comes on when Mountain Mode is selected. See "Mountain Mode" in Driver Selected Operating Modes on page 9‑26 for more information.