On certain vehicles, a sensor in the electronic brake boost system may have a bad connection. Under certain driving conditions, this could cause a loss of brake assist. If this happens, there would be a sudden increase in brake pedal force required to slow or stop the vehicle.
Reduced brake performance can cause extended stopping distances and increase the risk of a crash.
General Motors will notify owners by mail and instruct you to take your vehicle to a dealer to replace the electronic brake boost module.