On certain vehicles, the stop lamp switch may not have been installed properly causing and intermittent contact that could repeatedly cause the switch to cycle on and off. Over time, this may result in the stop lamp relay sticking in the on position, causing the stop lamps to remain illuminated. This could also impair the brake-shifter interlock, allowing the vehicle to inadvertently be shifted out of park position. These situations could increase the risk of a crash or a vehicle roll away causing injury and/or damage to property. Correction: Dealers will inspect the stop lamp switch for proper installation, if the switch is not installed correctly it will be re-positioned and the stop lamp relay will be replaced.
(Source: Government of Canada)