2009 Buick LaCrosse Owner's Manual - Page 180

CHECK GAS CAP This message may display if the fuel cap is not on, or is not fully tightened. The check gas cap light also appears on the instrument panel cluster. See Check Gas Cap Light on page 3-47. Check the fuel cap to ensure that it is on properly. The diagnostic system can determine if the fuel cap has been left off or improperly installed. A loose or missing fuel cap allows fuel to evaporate into the atmosphere. A few driving trips with the cap properly installed should turn this message off. See Filling the Tank on page 5-8 for more information. This message displays while the ignition is in ON/RUN. Press any of the DIC buttons to acknowledge this message and to clear it from the screen. This message continues to display for two seconds if it has not been acknowledged when the engine is turned off. It also re-displays for two seconds if the message has been acknowledged, but the condition still exists when the engine is turned off. If the condition still exists, the message re-appears when the engine is turned on. CHECK TIRE PRESSURE On vehicles with the Tire Pressure Monitor System (TPMS), this message displays when the pressure in one or more of the vehicle's tires needs to be checked. This message also displays LEFT FRONT, RIGHT FRONT, LEFT REAR, or RIGHT REAR to indicate which tire needs to be checked. You can receive more than one tire pressure message at a time. To read the other messages that may have been sent at the same time, press the set/reset button. If a tire pressure message appears on the DIC, stop as soon as you can. Have the tire pressures checked and set to those shown on the Tire Loading Information label. See Tires on page 5-54, Loading the Vehicle on page 4-20, and Inflation - Tire Pressure on page 5-61. The DIC also shows the tire pressure values. See DIC Operation and Displays on page 3-48. If the tire pressure is low, the low tire pressure warning light comes on. See Tire Pressure Light on page 3-39. This message displays while the ignition is in ON/RUN. Press any of the DIC buttons to acknowledge this message and to clear it from the screen. This message continues to display for two seconds if it has not been acknowledged when the engine is turned off. It also re-displays for two seconds if the message has been acknowledged, but the condition still exists when the engine is turned off. If the condition still exists, the message re-appears when the engine is turned on. 3-58