While traveling at the posted speed limit and approaching a signalized intersection, I attempted to brake for stopped traffic ahead. The vehicle did not decelerate as expected, and the automatic emergency braking/forward collision mitigation system did not activate or provide any braking assistance. Additionally, no forward collision warning or audible/visual alert was provided prior to impact. A red warning indicator illuminated immediately before the collision; however, there was insufficient time to take additional evasive action. As a result, my vehicle rear-ended the vehicle stopped in front of me. The apparent failure of the braking assistance and forward collision warning systems placed both myself and the occupants of the other vehicle at risk, resulting in a motor vehicle collision. The vehicle is available for inspection upon request. The cause of the malfunction has not yet been confirmed by a dealer or independent repair facility (UNKNOWN). The vehicle has been inspected by law enforcement and insurance representatives as part of the accident investigation. Prior to the incident, I had not observed any warning lamps, messages, or symptoms indicating a problem with the braking or forward collision systems. The only warning observed was the red indicator light that appeared immediately before the collision.