DETROIT – General Motors has agreed to recall certain model-year 2018-2020 Buick Regal vehicles which might have a defective vacuum-brake-assist system with a software issue at its root.

According to the National Highway Traffic Safety Administration Part 573 Safety Recall Report 22V-465, “In the event of a partial or full loss of vacuum-brake assist, the vehicle’s hydraulic-brake boost is designed to supply supplemental pressure to the vehicle’s brake system. A software error in the electronic brake control module (EBCM) may fail to activate the hydraulic-brake boost under these conditions.”

The remedy is a reflash of the software in the EBCM.

The specific problem cited by NHTSA is reduced or full loss of vacuum-brake-assist pressure in the 23,734 Regals could lead to reduced stopping distances.

“If the vehicle’s vacuum-power brake assist partially or fully fails, braking events may require additional stopping distance, depending on the brake pedal force applied by the driver.  Increased stopping distances could increase the risk of a crash,” NHTSA reported.

This condition might result in a warning message in the vehicle’s Driver Information Center and create increased pedal resistance for the driver.

GM is not aware of any crashes or injuries resulting from this condition.

Dealers were notified in late June as to the recall. Owners are scheduled to be notified by Aug. 15th.