2004 Toyota Prius Problems

What owners report

Owners of this model year most often describe intermittent headlight failures and sudden loss of drive power with multiple dash warning lights. Complaints also cover instrument panel and multi-display failures, and reduced or failed power braking with an alarm buzzer. Many reports come at low mileage for the lighting and power-loss items, while brake and shifter complaints cluster at higher mileage.

1. 1
   Exterior lighting

   Headlights go out intermittently while driving

   • 177 complaints (29%)
   • median 105,000 mi at 6.4 yrs old (157 state mileage)
   • owner-quoted repair $600 (median of 54 quotes)
   • filed 2006–2020

   Owners describe one or both headlights going dark while driving, often at night or in rain, and frequently say cycling the light switch off and back on restores them for a while. Some report the problem becoming more frequent over time. According to complaints, dealers replaced bulbs, the headlight assembly or a related computer, with repair bills commonly described in the hundreds to over a thousand dollars, and several owners say the failure returned after repair. Reported from roughly 45,000 to 250,000 miles, with many cases noted well past 70,000 miles.

   Recall 04V558000

   What to check: Ask the seller whether the headlights have ever cut out and whether bulbs, ballast or the light computer were replaced. Test both low and high beams at night and watch for flicker or dimming over a few minutes.

   2 excerpts from owner complaints in NHTSA records

   “Driver's side headlight was intermittent. I could jiggle the switch and it would come on. This occurred stationary and moving. I have replace the hid bulb twice with sylvania d2r. The headlight does not work now. Dealer will charge over $500 for headlight and ballast repairs--highway robbery. This problem started august 2014.”

   NHTSA complaint #10874978, filed 2016-06, 155,000 miles

   “Hid lights fail in my 2004 Prius and have for several years now - intermittently with no warning. At times, both lights fail at the same time, leaving me on a dark road unexpectedly. I have one replaced at the dealer, only to have it fail again. This is clearly a safety issue. Hundreds of these have been reported.”

   NHTSA complaint #10283524, filed 2009-09, 46,000 miles
2. 2
   Electrical system

   Sudden loss of power and dash warning lights

   • 213 complaints (35%)
   • median 16,948 mi at 1.6 yrs old (182 state mileage)
   • 3 mention a crash, fire or injury
   • owner-quoted repair $750 (median of 14 quotes)
   • filed 2004–2022

   Complaints describe the car losing drive power while moving, sometimes at highway speed, with the warning lights and a red triangle lighting up and a beep sounding; some vehicles would not restart and were towed. Several owners say the dealer reprogrammed the engine control unit, and some report the stall happened again afterward. Others link it to a low or failing hybrid battery or an engine-cooling loop problem. Reported from very low mileage (under 6,000 miles) up to about 160,000 miles, with many cases between 5,000 and 50,000 miles.

   Recall 12V5360003 related service bulletins

   What to check: Ask whether the car has ever stalled or shut down while driving and what the dealer found. Have a hybrid-knowledgeable shop scan for stored codes and check the hybrid battery and inverter coolant pump condition.

   2 excerpts from owner complaints in NHTSA records

   “Car suddenly lost power when being driven 30 MPH on city road. Computer said battery power lost; seems like gas engine was not recharging battery, but there was no warning until power loss. I was stuck in the middle of a city street with 2 small children, as the car would not make it to side of road. Another motorist helped push me to side of road and no one was hurt. The gas tank was full at the time of this incident. …”

   NHTSA complaint #10129674, filed 2005-07, 15,299 miles

   “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. …”

   NHTSA complaint #10389615, filed 2011-03, 123,000 miles
3. 3
   Brakes

   Brake warning alarm with little or no power assist

   • 68 complaints (11%)
   • median 86,415 mi at 6.4 yrs old (60 state mileage)
   • 11 mention a crash, fire or injury
   • owner-quoted repair $2,900 (median of 8 quotes)
   • filed 2004–2022

   Complaints describe a loud continuous beep along with brake, ABS and stability control warnings, followed by a pedal that goes to the floor or needs heavy pressure to stop the car. Some owners say the car can only be slowed with the parking brake or engine braking. According to complaints, dealers identified the skid control ECU or brake actuator assembly and quoted repairs ranging from about a thousand to several thousand dollars. Mostly reported between about 80,000 and 250,000 miles.

   2 related service bulletins

   What to check: Test the brakes firmly at low speed and listen for an alarm or feel for a hard pedal, and ask whether the brake actuator or skid control ECU has been replaced. A pre-purchase inspection should include a scan for ABS and brake system codes.

   2 excerpts from owner complaints in NHTSA records

   “Warning triangle, dash lights-brake, ABS, came on accompanied by a loud whining sound. The next time I needed to use the brakes I discovered that there was total brake failure - pedal down to the floor with no brakes. I was very fortunate that I was able to roll to a stop. I took the car to auburn Toyota (in ca) and they said it was a skid control ecu failure. They replaced it at a total cost of $1868.74.”

   NHTSA complaint #10189194, filed 2007-04, 83,668 miles

   “When driving down the road all of a sudden we tried to use the brakes and it felt like we only had 10% of our braking ability. The brake light came on and ABS light went on and the stability control light came on as well as a warning buzzer. It felt like we had manual brakes.”

   NHTSA complaint #11208876, filed 2019-05, 190,000 miles
4. 4
   Electrical system

   Instrument panel and multi-display going blank

   • 94 complaints (15%)
   • median 60,500 mi at 6.1 yrs old (82 state mileage)
   • 2 mention a crash, fire or injury
   • owner-quoted repair $1,400 (median of 17 quotes)
   • filed 2005–2025

   Owners report the instrument cluster going dark or flickering so speed, fuel level and warning lights are unreadable, sometimes returning after a restart or battery disconnect. Some also describe the center touchscreen that controls climate, audio and energy information working only intermittently, and one owner noted loss of windshield defrost control when it failed. Complaints mention dealers diagnosing a faulty multi-display or power switch. Reported from about 20,000 to 180,000 miles, with several cases between 45,000 and 120,000 miles.

   1 related service bulletin

   What to check: Start the car and confirm every gauge and warning light illuminates and stays lit, then operate the center screen through climate and audio menus. Ask whether the cluster or multi-display has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “I own a 2004 Toyota Prius. Just last week the touch screen that controls the heating / air conditioning, the radio, the current mpg information and condition of the ni-metal hydride battery and the gas engine interconnections, began to fail. Sometimes it works for a while, then it stops for some time then it might or might start working again before I get where I am going. It is extremely intermittent in its correct operation. …”

   NHTSA complaint #10299977, filed 2010-01, 144,679 miles

   “All the instrument cluster lights continue to go out on my 04 Prius. I don't know how much fuel I have this could be a safety issue. I don't know how fast I'm going this could definitely be a safety issue. And zero warning lights come on this is definitely a safety issue. By looking on the internet I can tell thousands of priuses have this exact same issue with the instrument panel cluster going out. This should definitely be a recall.”

   NHTSA complaint #11373705, filed 2020-11, 160,000 miles

Buying note. A pre-purchase scan for stored hybrid, brake and lighting codes plus a night test drive of the headlights will catch most of what owners describe here. Ask for service records showing whether the hybrid system, brake actuator and instrument cluster have already been addressed, since those repairs are the costly ones.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.