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What 28 owners told NHTSA about the 2015 Cadillac ATS

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (28)Crash / fire / injury (1)Electrical system (6)Steering (6)Transmission & drivetrain (5)Lights (4)Brakes (3)Fuel system (3)Suspension (2)Tires (2)Airbags (1)Engine (1)

3 of 28 complaints match · Brakes · clear filters

Apr 19, 2024Brakes

The contact owns a 2015 Cadillac ATS. The contact stated that while driving at an undisclosed speed and depressing the brake pedal all the way to the floorboard, the vehicle hesitated to respond as needed. The brake assist warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed that the brake vacuum pump had failed. The vehicle was repaired; however, the failure reoccurred. The vehicle was then taken to an independent mechanic, where it was diagnosed that the brake sensors had failed. The vehicle was repaired; however, the failure persisted. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic) however, the VIN was not included. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was 132,000. The VIN was not available.

NHTSA ODI 11584055

Aug 10, 2020Brakes

TL* THE CONTACT OWNS A 2015 CADILLAC ATS. THE CONTACT STATED THAT THE BRAKES BECAME INOPERABLE AND FAILED TO STOP THE VEHICLE WHEN THE BRAKE PEDAL WAS DEPRESSED. THE BRAKE ASSIST AND CHECK ENGINE WARNING LIGHTS ILLUMINATED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHO REPLACED THE BRAKES THREE WEEKS PRIOR HOWEVER, THE FAILURE RECURRED. THE CONTACT INQUIRED ABOUT A RECALL. THE CONTACT WAS INFORMED THAT THERE WAS NO RECALLS ASSOCIATED WITH THE VIN. THE CONTACT CALLED VALDOSTA CADILLAC LOCATED AT 3685 INNER PERIMETER RD, VALDOSTA, GA 31602, AND WAS INFORMED TO BRING THE VEHICLE IN FOR A DIAGNOSTIC TEST. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 90,000.

NHTSA ODI 11344289

Dec 7, 2018Brakes

STARTED VEHICLE AND WENT IN RESERVE. THEIR WAS NO RESPONSE FROM THE BRAKES AS I PRESSED ON THE BRAKE PEDAL, THE VEHICLE CONTINUED TO MOVE REARWARD. I HAD TO APPLY HARD PRESSURE TO STOP THE VEHICLE. BRAKE PEDAL BARELY MOVES AS I PRESS IT. HARD TO STOP VEHICLE.

NHTSA ODI 11156889

Working with the data? Download all 28 complaints as CSV · fetched from NHTSA July 21, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2015 Cadillac ATS verdict →