One problem related to battery propulsion system has been reported for the 2001 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Prius based on all problems reported for the 2001 Prius.
My car (2001 Prius) was at a dealership (marina del rey Toyota) for service. While parked, with no one inside and the ignition off, the main propulsion battery caught fire and burned through the vehicle interior, causing a total loss. Toyota blames the fire on a battery defect.