Table 1 shows one common traction control system related problems of the 2014 Toyota Prius.
| Problem Category | Number of Problems |
|---|---|
| Traction Control System problems |
The contact owns a 2014 Toyota Prius. The contact stated that the abs and the traction control warning lights were illuminated. The vehicle was taken to the dealer to be diagnosed, and the contact was informed that the brake master cylinder needed to be replaced. The vehicle was not repaired. The vehicle was taken to a certified mechanic and was diagnosed, and it was determined that the brake booster had failed and needed to be replaced. The vehicle was repaired; however, one day later, both warning lights returned. The vehicle was returned to the mechanic and air was blown into the hydraulic valves and the other valves were cleaned; however, the failure persisted. The manufacturer was not informed of the failure. The failure mileage was approximately 150,000.
The contact owns a 2014 Toyota Prius plug-in hybrid. The contact stated while driving at various speeds and attempting to depress the brake pedal, the brake pedal was very stiff. The contact stated that the abs, brake lights, and traction control warning lights were illuminated. The vehicle was taken to an independent mechanic, who diagnosed a failure with the brake power booster and brake power gasket. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 167,000.