2013 Buick Regal Owner Manual - Page 241

Driving and Operating When the System Does Not Seem to Work Properly The following messages may be displayed on the DIC: SERVICE PARK ASSIST: If this message occurs, check the following conditions: . 9-45 PARK ASSIST OFF: If the system does not activate due to a temporary condition, this message displays. This can occur under the following conditions: . Fuel Use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend the use of gasoline advertised as TOP TIER Detergent Gasoline. Look for the TOP TIER label on the fuel pump to ensure gasoline meets enhanced detergency standards developed by auto companies. A list of marketers providing TOP TIER Detergent Gasoline can be found at www.toptiergas.com. TOP TIER gasoline is only available in the U.S. and Canada. The driver has disabled the system. An object was hanging out of the trunk during the last drive cycle. Once the object is removed, the system will return to normal operation. The bumper is damaged. Take the vehicle to your dealer to repair the system. Other conditions, such as vibrations from a jackhammer or the compression of air brakes on a very large truck, are affecting system performance. . The ultrasonic sensors are not clean. Keep the vehicle's rear bumper free of mud, dirt, snow, ice, and slush. For cleaning instructions, see Exterior Care on page 10‑92. The park assist sensors are covered by frost or ice. Frost or ice can form around and behind the sensors and may not always be seen; this can occur after washing the vehicle in cold weather. The message may not clear until the frost or ice has melted. . . . If the above conditions do not exist, take the vehicle to your dealer to repair the system.