2012 Toyota Prius problems

“I own a 2012 Toyota Prius with approximately 132,000 miles. I first experienced problems with the braking system approximately one year ago, in 2025. The ABS, brake, and other warning lights began illuminating intermittently, and I experienced occasional hesitation in braking response. I was concerned enough about the vehicle's safety that I stopped driving it for an extended period. After recently returning the vehicle to service, the warning lights continued to appear intermittently, even when the brakes seemed to function normally. An independent mechanic inspected the vehicle but could not retrieve a diagnostic code at that time. On November 1, 2026, an ABS diagnostic scan at O'Reilly Auto Parts confirmed trouble code C1391, "Abnormal Leak of Accumulator Pressure." The diagnostic report recommended replacement of the brake booster and master cylinder. Toyota previously acknowledged this brake booster problem through Customer Support Program ZJB, which covered certain 2010–2015 Prius vehicles with this defect. Despite my vehicle having fewer than 150,000 miles, Toyota informed me that the coverage period had expired and that no exceptions would be granted. I…”

“Odometer Fraud. The contact purchased a 2012 Toyota Prius. The contact stated that while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 187,000, and at the time of registration, it was discovered that the mileage was 227,000.”

“Unknown. There were a multitude of codes that appeared on the diagnostics causing problems with engine. The temperature, brake, tire sensor lights are all on. The cruise control is not working. White smoke emitting from tail pipe and engine. Main engine coolant leaking. Car overheating rapidly.”

“The contact owned a 2012 Toyota Prius. The contact stated that while making a left turn at 10 MPH, another vehicle crashed into the vehicle and t-boned the front passenger's side door of the vehicle. The air bags did not deploy. There was no warning light illuminated. After the impact, the front windshield slowly cracked. A Police report was filed. The contact and her husband were transported by ambulance to the hospital. The contact suffered a fractured sternum, five fractured ribs, a crushed left wrist, and two fractured bones in the left ankle. The contact's husband had a fractured neck and five fractured ribs. The vehicle was towed to a tow yard and was declared a total loss by the insurance company. The manufacturer was not made aware of the failure. The failure mileage was approximately 140,000.”

“Brake master control system failure with constant issues over 80k miles. Forward running lights control housing has not held a light fixture since day one and dealership wants to charge for light replacement. It’s a faulty part and burnt through the housing. Olathe Toyota refused to repair under warranty saying it was a customer issue but is clearly a safety problem. Irresponsible dealer management.”

“The glass sunroof spontaneously exploded or imploded. There was a loud popping sound and I looked up at the sunroof, and it was shattered. glass started falling on me as I was driving on the highway. There have been many reported cases of this happening found online. https://topclassactions.com/lawsuit-settlements/lawsuit-news/toyota-owners-should-be-aware-of-reported-exploding-sunroof-risk/ It has not been inspected yet. no warning messages.”