2015 Toyota Prius problems and complaints
Owners have filed 166 complaints with NHTSA about the 2015 Toyota Prius. The most-reported areas: Service Brakes (93), Electrical System (27), Unknown Or Other (15).
Key takeaways
- 166 owner complaints on file with NHTSA.
- 29 involve a crash, 1 a fire, 17 reported injuries.
- Complaints are unverified owner reports; recalls are confirmed defects.
| Component | Complaints | Share |
|---|---|---|
| Service Brakes | 93 | 56% |
| Electrical System | 27 | 16% |
| Unknown Or Other | 15 | 9% |
| Power Train | 13 | 8% |
| Engine | 8 | 5% |
| Forward Collision Avoidance | 7 | 4% |
| Exterior Lighting | 7 | 4% |
| Vehicle Speed Control | 7 | 4% |
| Structure | 6 | 4% |
| Fuel/Propulsion System | 6 | 4% |
| Air Bags | 6 | 4% |
| Hydraulic | 4 | 2% |
One complaint can name several components, so shares add up to more than 100%.
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2015 Toyota Prius 5 HB FWD | 4/5 | 4/5 | 5/5 | 4/5 |
Latest complaints, as filed
Owner-written and unverified by NHTSA.
Service Brakes,forward Collision Avoidance - filed 2026-10-03
The brake booster pump has malfunctioned, exactly 1 year outside of the secondary coverage supplied in the voluntary customer support program for this exact issue, despite being under 150,000 miles. Now the car is unsafe to drive since the brakes are malfunctioning.
Service Brakes - filed 2026-09-17
I am reporting an active, severe safety hazard regarding the braking system on my 2015 Toyota Prius ( Mileage: 79,000). The vehicle has been officially diagnosed by Toyota Culver City with Diagnostic Trouble Code DTC C1391, confirming an internal failure and lack of pressure within the brake booster/actuator assembly. ...
Service Brakes - filed 2026-08-31
Problem: Brake Actuator is pulsing the Booster Pump to keep running intermittently, 5-10 seconds. Console lights lit up for ABS problem. Does not clear. Toyota Dealership Report: DCT C1391 Abnormal Leak: Monitored TEH Accumulator Pressure and its not holding pressure. Pump keeps running. Rec[ommend] Brake Actuator...
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More for the 2015 Toyota Prius
Complaints are reports filed by owners with the National Highway Traffic Safety Administration. NHTSA publishes them without verifying them, and counts rise with how many cars were sold, so compare years of the same model rather than different models. Crash ratings are NHTSA's own 5-Star Safety Ratings results.