One problem related to software has been reported for the 2002 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Toyota Prius based on all problems reported for the 2002 Prius.
Incident: car engine on 2002 Prius having trouble starting and dying after having been started. We were told that the "engine control unit" was showing an error and due to a manufacturing or software problem, could not be reprogrammed and had to be replaced.