One problem related to underhood wiring has been reported for the 2004 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Prius based on all problems reported for the 2004 Prius.
The contact owns a 2004 Toyota Prius. He states that vehicle lost power while traveling at high speeds. The incident just happened one time. The dealer reprogrammed the vehicle, not sure if it fixed it or not. Car lost power and would not re-start. It was towed to Toyota service department. Engine control unit was reprogrammed and car has since ran properly for 600 miles.