Five problems related to engine have 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.
Total breakdown of wife's 2004 Prius on September 2 in fine weather one in san jose. The vehicle displayed sudden and significant loss of power while merging into the interstate. Loss of gas/engine power with failure of the internal combustion with engine to start, resulted in only electric motor propulsion and breakdown on the highway as the battery quickly went to single pink bar level within a 1/2 miles. Multiple mil lamps lit up and stayed on. Began to merge onto the highway from a stop speed of 30 or 40 mph and slowly accelerated into heavy traffic. She had to pull off to the (ugh) breakdown lane of the highway with all of its debris, etc. The dealer completed the repair, san jose invoice number tocs190787 dtd 9/2/05 applied eg047-04 on car. The dealer repairs seemed to have fixed the car. Contacted a Toyota Prius advisor with three concerns: if there was a service bulletin for this characteristic that would prevent the roadway failure then why was it not executed during prior services 3-9-05, 5-26-05 & 6-09-05 at this same dealer. What led one to believe that the car was not reliable after this repair. The consumer, an accomplished engineer, a knew about software bugs. A software bug did not impair operation until the right combination of environmental factors was reached. The consumer assumed that all Prius had this potential bug that contaminated the electronic control unit (ecu). Ecu.
While driving at 25mph, 4 trouble lights lit up on dashboard. After 1-2 more miles, the engine lost all power, despite the gas engine still running. The electric system showed no battery power. Restarting the engine didn't help, and the car had to be towed.
Problems began 5-10-05. Several warning lights appeared on dashboard. The vehicle experienced a loss of power. The electric motor and the battery were working correctly, however, the gas portion of the engine was not working. Dealer reported ecu was out of calibration, and was reprogrammed. Vehicle is now repaired. Driver visited a forum where she noticed there was a report in the wall street journal and she felt unsafe driving vehicle.
1) my wife was driving our 2004 Toyota Prius and the car had a warning light turn on on display, went to "limp" mode (slow) and suddenly stopped after 1/2 mile. 2) car could not be controlled, no power. 3) Toyota towed car to shop and replaced ecu controller in area of fuel tank, ecu relay and entire fuel tank assembly. Problem has not happened again.
Pe05029 2 times the car engine stopped for no reason at all. Dashboard lit up entirely. Both times the car restarted. Each time, fewer lights came on. Brought car in 2x- 1st time, did nothing. 2nd time, supposedly upgraded program. When 1st heard about your investigation, contacted Toyota to see if we were part of the 33-- we believe it is being under-reported. Contact name: diane romanchick and paul embree.