One problem related to dash 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.
While driving 35 mph the dashboard lights flashed and the vehicle shut off. Dealer stated the vehicle's software needed to be updated. The problem has not recurred.