Toyota Prius problems by year

2010–2015

Coolant loss, misfire or head gasket failure (EGR clogging) 2010–2015 Toyota Prius
Red triangle, loss of power or no-start (inverter IPM failure) 2010–2015 Toyota Prius

2010–2010

Brakes feel inconsistent over bumps (ABS software recall) 2010–2010 Toyota Prius

2004–2009

Hybrid battery failure (red triangle, poor mileage) 2004–2009 Toyota Prius