NHTSA Complaint #11464304 — 2013 HYUNDAI SONATA

My safety was put at risk and the life of others as a chime sound began to sound and the "check brake/Hybrid System Warning" was displayed on the dashboard. This caused the car to press the emergency breaks on its own slowing the vehicle to a complete halt on freeway. This malfunction could have caused a multi vehicle collision. This was taken for inspection and Scanned with GDS and C1235 Pressure sensor, is internal in HECU and cannot be repaired, HECU must be replaced. The vehicle is unsafe to drive and pedal sinks which feels like car does not stop. The output signal voltage of the pressure sensor is out of the specified range, the monitoring starts 1 sec after power up. The cause of this could be that there is a faulty pressured sensor and/or open or short of pressure sensor circuit. The pressure sensor installed in the HECU, converts the brake pressure to judge the drivers brake intention when the ESC program is operated. When pressure is applied to the sensor, the resistance of the sensor's strain gauge changes. The change in resistance changes the voltage output from the sensor. A fail safe inhibits the ESC/DBC control and allow the ABS/EDB control. The ESC/DBC warning lamp is activated. A safety recall should be established by this establishment as other Hyundai Sonata Hybrids are having the same malfunctions and are having to repair costs out of their own pockets, $4,300 given quote.