2004 Toyota Prius: check engine light

Filed Apr 14, 2022 · Electrical, Engine · 83,200 miles · CA

The contact owns a 2004 Toyota Prius. The contact stated while driving approximately 30 MPH, the vehicle stalled. The vehicle lost power steering functionality but the contact was able to safely pull off of the road. The contact stated that the check engine warning light and other unknown warning lights were illuminated before the vehicle stalled. Additionally, the instrument panel went black. The contact stated that she attempted to restart the vehicle but the vehicle would not restart. The contact had the vehicle towed to her residence and later towed to an independent mechanic. The vehicle was diagnosed and it was determined that a wiring cable connector had melted onto the battery and affected the engine. Additionally, the fuel pump needed to be replaced. The vehicle was repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 83,200.

Filed Apr 1, 2019 · Driver assistance, Electrical · 5 miles · CA

(combination meter problem) while driving at night on the freeway the entire instrument panel (dash board) started blinking on and off. For our safety, we decided to slow down and exit the freeway and stop in a safe area. We turned the ignition off, then started the car, with nothing appearing on the instrument panel beside the check engine light. We lost the speedometer, all gauges and all the electrical and electronics which normally helps to guide our driving.we had to take the car to the toyota dealer the following morning which took seven days to replace the combo meter. I later found out that this issue is not knew and there was a letter issued by toyota titled (2004 to certain 2009 model year prius vehicles combination meter warranty enhancement notice). The letter stated that they had problems with some of these prius year models and that if the owner did not experience this condition to file the letter in their vehicle's owner's warranty information booklet. Here is my request: this should not be a warranty issue but should have been a safety recall as depending of the number of miles the vehicle is driven, this issue seems to sooner or later occur. I repaired my vehicle and paid for all the repairs, all I need now is for the federal safety agency to look into this problem, investigate it and have toyota send a recall letter rather than an extended warranty. This way I can receive a reimbursement for the repairs. Here is a link to the letter and all consumers complaints: https://www.toyoheadquarters.com/threads/2004-2009-toyota-prius-combination-meter-warranty-extension-ztv.174/ I believe for the safety of all prius drivers in the USA, this should be changed to a recall since many of these model and year prius vehicles are still on the road and will reach a certain mileage to make to combination meter fail.

Filed Apr 5, 2018 · Engine · 83,772 miles · CA

Tl* the contact owns a 2004 toyota prius. While driving 45 MPH, the hybrid system, stability control, check engine, and SRS warning indicators illuminated. The vehicle was taken to an independent toyota mechanic who informed the contact that the vehicle needed a new hybrid coolant pump and water pump. The vehicle was not repaired. The dealer was not contacted. The manufacturer was notified and did not assist. The failure mileage was 83,772.

Filed Sep 16, 2017 · Driver assistance, Electrical · 104,000 miles · FL

My 2004 prius's check engine light turns on randomly wnd often and I lose full power of the car. The battery is fully charged. The car stopped 4 times today - lost all power and the brake would not stop the car.

Filed Aug 19, 2015 · Engine · 105,675 miles · VA

Warning triangle and check engine lights came on while traveling. Took vehicle to independent mechanic, who diagnosed hybrid water pump malfunction; he noted a recall, so I took vehicle to dealer. Dealer charges $130 to plug into diagnostic system, finds same problem; wants $750 to replace. Pump was replaced @ 30,000 miles ago under aon recall. Multiple reports on web about the same replacement part failing after short time.

Filed Oct 11, 2012 · Electrical · 141,000 miles · DE

. 10/09/2012 I went to start my 2004 prius I hit the power button and the dashboard lights had not work. You did not know the status of the car. Actuated the power switch and the brake peddle numerous times to no avail. I tried to select the gear and the car would move. But dash board display did not light. The lights and turn signals work fine. I drove 15 miles home with on display. I selected the park button and the car parked I went to turn off the power button and the car would not turn off the was in the battery mode. I tried to shut it off by disconnecting the 12 volt battery to no avail. I found a fuse that if I pulled it out the car would shut off. I tried the power numerous times and the car turn on and with the dashboard display working. On the morning of 10/10/2012 I tried go to work and when the power and the brake are pushed the dash board lights would not light. The car would move if selected to drive now the engine was running because the car was cold. I placed the car in park and selected the power button to off now the engine will shut off. Again I tried the power and the brake numerous times to no avail. I tried the fuse trick again it worked the engine stopped. Replaced the fuse and tried the power button it work and the dash display were lighted with numerous lights because I shut the down in unapproved mode. Turned the power switch on & off. Numerous times all light were normal except the check engine was on I drove to the toyota dealer. I was told that is a normal issue the dashboard displays go bad. I understand the dashboard display can go bad. My issue is the safety problem that when the display fails the power button does not shut car off in the battery mode or the engine mode. That's a big issue .

Filed Oct 22, 2011 · Acceleration · 86,360 miles · VA

While driving slowly in traffic, after a particularly rough transmission shift, the large red exclamation mark warning inside a triangle lit up on the dashboard, along with the yellow "check engine" and "vsc" (vehicle stability control) warnings. The car was pulled over to a safe location and stopped. The engine was turned off and on a few times and the warnings continued. On the fourth or fifth turn-on, the problem cleared itself and has not recurred. This is the second electronic glitch that has occurred on this vehicle while driving. The first was reported as odi id number 10407518. Both times, the problems, which had different symptoms, corrected themselves after turning the engine off and on a few times. Since the dealer was unable to duplicate the problem in the first case, the dealer has not yet been informed in this case. It has been exceedingly fortunate that both of these electronic glitches, neither of which were related to floormats by the way, were not of the sudden-unwanted-acceleration variety. The randomness of both the timing and the symptoms of these electronic glitches suggest that sudden unwanted acceleration could easily have been the result.

Filed Mar 9, 2011 · Engine · 123,000 miles · CA

I was driving on the freeway at about 63 miles per hour, I had been driving for about 20 minutes when my engine cut out, all the lights on my dash turned on including the check engine and red triangle warning light. I drifted to the shoulder and powered the car off. I tried to start it 2 more times, both times the engine did not start and the red triangle and the check engine lights came on again. I waited longer and tried to power up the engine again, it started with the check engine light on. I took it to the dealership 3 days later (they could not see me sooner), ran the codes and it only came up with the code poaof, which means that the engine did not start. They had no explanation of what happened and did not seem to share my concern that this could happen again. The did recall work for me and sent me home.

Filed Mar 11, 2010 · Brakes, Engine · 61,000 miles · TX

Tl*the contact owns a 2004 toyota prius hybrid. While driving approximately 60 MPH, the check engine warning light, and an unknown warning light illuminated on the instrument panel. The dealer was notified and advised the vehicle was safe to drive; unless the temperature, brake or oil warning lights illuminated. The vehicle began to lose power and the anti-lock brake system warning light illuminated. The vehicle was maneuvered to the side of the highway. The vehicle was towed to the dealer. The failures were related to the inverter water pump and the skid control electronic control unit (ecu). The inverter water pump was replaced. The failure occurred a second time. The vehicle was repaired for the malfunction. The failure and current mileages were 61,000.

Filed Nov 16, 2009 · Acceleration, Brakes · 68,000 miles · FL

About 40% of the time, my toyota prius doesn't want to stop or slow down when the brakes are applied. Under these conditions, I have to apply the brakes hard and then the car will slow down. It feels like the car wants to "run away" when the brakes are applied. It exhibits this behavior in many circumstances: stopping at a stop light, slowing down on an expressway, or slowing down on a city street. *tr updated 11/23/09 *bf the check engine light illuminated. The passenger front window switch wasn't opening or closing the window unless the master switch was used. The throttle body had to be cleaned. The fan belt and brake light switch were replaced. Updated 11/24/09 updated 01/06/10 *bf updated 01/07/10.

Filed Apr 6, 2008 · Acceleration · 62,409 miles · CA

I was driving on the 605 freeway in the carpool lane at approximately 70 miles per hour when without warning, the car suddenly lost power and the check engine and master hybrid warning lights came on. I had to cross four lanes of rush hour traffic to pull to the right side of the freeway as the car lost power. I was barely able to drive the car safely to the right shoulder of the freeway. The car was towed to the dealer since it was not drivable. This was a very dangerous and scary experience. Fortunately, a serious accident was narrowly avoided. The dealer attributed the problem to a short. The hybrid vehicle control computer was replaced. The replacement part number is 89981-47270.

Filed Jan 26, 2007 · Engine · CA

Prius stalled when pulling into traffic from a stop light. All lights on the dash board were illuminated including the check engine light. Only electric drive systems was operational. I immediately pulled into a parking lot and turned the car off. Upon restart, only the check engine light was on. Was able to drive to the dealership 2 miles away. Stored error code p0a7a was identified - bulletin eg029-05. "false m.I.l. "on" condition. An updated control ecu was installed, covered by warranty.