2012 Hyundai Sonata Hybrid: grinding or squealing brakes

Filed Nov 28, 2023 · Brakes · 113,340 miles · AZ

The contact owns a 2012 Hyundai Sonata Hybrid. The contact received notification of the federal safety agency Campaign Number: 23V651000 (Service Brakes, Hydraulic) however, the part to do the recall repair was not yet available. The contact stated that while driving at an undisclosed speed, the Check Brakes and Hybrid System Warning: Safely Stop and Do Not Drive messages were displayed. The brakes then made a grinding sound while the brake pedal was depressed. Additionally, the vehicle lost motive power while driving. The contact pulled over and restarted the vehicle. The vehicle was taken to the dealer, where it was diagnosed with a faulty HCU (Hybrid Control Unit) and AHB (Active Hydraulic Boost). The dealer retrieved DTC Codes: P1886 (Inappropriate and Low SOC) and C1237: (Primary Pressure Sensor Signal). The dealer replaced the oil valve gasket and recalibrated the brakes. The manufacturer was made aware of the failure. The failure mileage was approximately 113,340. VIN tool confirms parts not available.

Filed Sep 1, 2022 · Brakes · 204,900 miles · GA

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that while driving at various speeds, the brake pedal was depressed; however, the vehicle failed to stop. The contact stated that he heard a grinding sound in the wheels. The contact stated that the Hybrid System and brake warning lights were illuminated. The vehicle was taken to an independent mechanic where the brake pads, rotors, and calipers were replaced; however, the failure recurred. The vehicle was taken to several independent mechanics however, the failure could not be duplicated. The dealer was notified of the failure and an appointment was scheduled for October. The manufacturer was not notified of the failure. The failure mileage was 204,900.

Filed Feb 10, 2022 · Brakes · 128,000 miles · FL

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated that he had changed the battery due to a previous battery failure. The contact stated that when the vehicle was started a warning for "Check Brakes - Hybrid System Warning - Safely Stop and Do Not Drive" message was displayed along with warning beeps. The contact checked the brake fluid level which was full. The contact stated that while the vehicle was parked with the engine running and the brake depressed, the contact heard a high-pitched grinding sound coming from under the hood. The contact stated that the brake pedal shaking abnormally. The vehicle was not taken to the local dealer and had not been diagnosed or repaired. The contact no longer drove the vehicle due to the failure. The manufacturer had not been informed of the failure. The failure mileage was approximately 128,000.

Filed Nov 12, 2021 · Engine · 99,612 miles · AZ

The contact owns a 2012 Hyundai Sonata Hybrid. The contact stated while driving 45-50 MPH, the vehicle started making an abnormal beeping sound. The contact stated that the check engine warning light and several other unknown warning lights illuminated, and the vehicle began to stall. The contact stated that she pulled into a parking lot, parked, and turned off the vehicle. The next day the vehicle was towed to the dealer who diagnosed that the system hybrid module needed to be updated. The contact stated that the system hybrid module was updated; however, the failure reoccurred while driving. The warning message "Hybrid system Warning; Safely Stop and Do Not Drive", and the brake warning light and an unknown warning light illuminated. The contact also stated that the vehicle made an abnormal grinding sound. The dealer was notified of the failure. The manufacturer was not notified of the failure. The vehicle was not repaired. The approximate failure mileage was 99,612.

Filed May 27, 2014 · Brakes · 62,085 miles · FL

When the car was started a beeping alarm sounded with a warning stating that there was a brake failure. Yellow triangle with black exclamation point also warning me not to drive. Brakes had severe grinding when trying to move. This is the second time that this has happened to the car. First time was approximately a year ago. I was originally told then that there may have been a hydraulic problem but then told that it was a bad connection somewhere. Waited approximately 15 minutes and car starts with out a problem. My fear is that the brakes will lock or fail while I'm driving on the highway.

Filed May 30, 2013 · Brakes · 8,000 miles · NM · crash

Proceeded to back out of parking space. Brakes began making loud grinding noise. Pulled back into parking space when brakes failed. Brake failure light and chime was activated. Vehicle would not stop and hit the concrete handicap sign stopping the car. Previously had problem with navigation unit which was replaced once and ready for second replacement. Told service manager we thought it may be electrical related, not defective units. Believe the problem with navigation unit is related to the brake failure. After accident, hyundai had automotive engineering consultants examine car. Hyundai said there was nothing wrong. However, service manager at dealer said the car had main hydraulic failure and new part was ordered. If nothing was wrong, why was hydraulic unit replaced. Hyundai refused to do anything.