Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2006 Toyota Prius owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2006 Toyota Prius. The contact stated that the vehicle intermittently failed to shut-off as needed with several unknown warning lights illuminated. The contact had taken the vehicle to the dealer on three separate occasions and the mechanic was able to either disconnect the battery or shut-off the vehicle as designed. The manufacturer had been notified of the failure and informed him that the vehicle was out of warranty and that there were no recalls on the vehicle. The contact filed a case with the manufacturer. The vehicle was not diagnosed nor repaired. The approximate failure mileage was 160,000. Consumer stated Toyota is refusing to responsibility even with extended warranty if problem occurred after 2012.
One afternoon, in the Summer of 23, I entered my Toyota Prius to run some errands. Once I proceeded to power on the car, none of the dashboard lights illuminated. This included the gas gauge, speedometer & transmission indicator. Fortunately, I was only driving a few blocks down the road from my residence as I live in a small rural town with little congestion, little traffic and mostly two-lane roads. I can't imagine this occurring in a much larger metropolitan city. When I arrived at my destination, I discovered that my Prius wouldn't shut off. This dashboard malfunction was preventing the Toyota from powering off. I quickly completed my errands with my vehicle running during this entire ordeal. Finally, when I returned home, I frantically researched on YouTube regarding this issue and discovered many others who also were having these no-illuminating-dashboard problems. …
The light up display for the odometer, fuel gauge, and speedometer does not always light up. When it is not lit, the cruise control and any warning and informative alarms/lights also do not work. This is a well-known issue among owners of these cars, related to the capacitors on the circuit board for the display being defective, and there is extensive documentation of it online. It may also have had a technical service bulletin released for the issue, but I'm not entirely sure. The light goes out intermittently and is not always consistently out. I did mention it to the service personnel when I took it in to get recalls repaired recently, and they didn't seem surprised or unaware of the issue. I did not ask them to diagnose or fix it, as I know I can get it done for a better deal elsewhere.
Discovered through failures repeated to dealers that certain items (Brakes, dashboard, et. al.) were recalled by Toyote. Never received recall notices. Contacted Toyota who demanded the vehicle be taken to dealer and now refuses to do anything. Have complete documentation to attach to this communication. Essentially: Dashboard failed, brakes failed when auto in operation. Likely there are UNKNOWN additional recalls, etc. of which we were not noticed
I was Driving down the main road at night time in my 2006 prius and the headlights both went out and all most caused a crash. I pulled over turned my car off then back on and the headlights came back on so i started driving home. After driving a couple blocks i was pulled over by the police because my drivers side headlight was off. Luckily he let me go with a warning, but i work at night and am losing money daily because of this problem. I sent toyota a email and no answer. There has been many electrical problems with this car and the speedometer still says i am deiving 34 to 35 mph while i am actually only going 30mph. I think that toyota should fully fix the problems in thos car. Its amazing there can be so much wrong with a vehicle and they not have to replace the vehicle with a vehicle that works or fix all the problems and give me a loaner vehicle. …
The following describes a near total failure of the brake system that accompanies and is triggered by routine aging of the battery. I believe this applies to multiple model years and editions of the Prius, based on reports by other owners on owners' discussion groups. I believe this should have the highest severity level. Here is what happens: An alarm is sounded, several warning lights ABS, VCS appear, and soon after that, the front brakes stop working. The rear brakes then prove ineffective and lock up. The happens with high frequency under any of the following conditions: (a) as the battery approaches 3yrs age, (b) it is excessively cold outside. (c) there is a higher than typical load on the 12V system from any of a variety of reasons. After installing a fresh new 12V battery, the above happens with much less frequency. …
Hi, After being parked for about 1.5 hrs my back seat on the drivers side caught on fire. I understand this is where a battery is and that newer cars of this brand have had recalls for this problem.
I purchased a new 12v battery at about 30K miles. At about 59K miles the 12v was discharging at random times. At first I thought it was because I was leaving lights on, but it began happening more frequently. I did some research and learned that when the key is in Smart mode and it is within 10 feet of the car it can discharge the 12v. I turned off the Smart key but the 12v discharged again a few more times until I could no longer get a charge when I jumped it. I had it towed to a local mechanic who installed a new 12v and 2 fuses ($500!!), but there were 4 or 5 warning lights that couldn't be reset so I drove it to the Toyota dealer. For some reason the Toyota service rep asked if I had all the recalls serviced. I was told I could not drive the car because it needed a new electronic converter unit ($5800!!!) and there was a real danger the car would die while I was driving. …
Purchased 2006 Toyota Prius used on aug 17, 2013 (61,500 miles). Within a month I was pulled over by police for passenger side headlight out while driving at night, but when headlamps are turned off and on again the headlight came back on, and the police officer thought he was crazy so he just issued a warning. The headlight continued to go out intermittently and I replaced the bulbs myself in November 2013 (philips HID headlight bulbs $95). The headlight still went out intermittently and I finally replaced both headlight assemblies in July 2016 by an independent mechanic (approximately $1000 at 143,000 miles). Passenger side headlight still goes out intermittently. NHTSA launched a probe in April 2009, but then dropped the investigation after Toyota said it would initiate a "consumer service campaign" to address the issue. …
As I was reversing and my foot was on the gas pedal a loud beep came on, all of the dashboard warning lights lit up including the brake light. I checked to see if my parking brake was on and it was not. I put the car on park and turned the car off and on. My car worked I drove a few minutes and as I was approaching the freeway I luckily came to a stop on a red light. Suddenly the same loud beep, warning lights, and break light came on and this time because my foot was on the brake pedal I felt the brake extremely hard/stiff. Because I was at a red light I quickly put my car on park turned the car off and then on again and made a right turn to avoid going on the freeway. …
NHTSA investigations
Pedestrian alert sounds
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles.
Electrical complaints in other Prius years
Frequently asked questions
How common are electrical problems on the 2006 Toyota Prius?
NHTSA has 152 complaints about the electrical system of the 2006 Toyota Prius, 11% of the model year's 1,439 complaints. The component named most often is instrument cluster/panel (3 mentions).
Is there a recall for 2006 Toyota Prius electrical problems?
No. NHTSA lists no electrical system recall for the 2006 Toyota Prius, though it has 6 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2006 Toyota Prius electrical problems start?
Half of the complaints with a recorded mileage happened before about 62,000 miles, and 9% before 25,000 miles.
Is it dangerous?
Owners linked 2 crashes, 2 fires and 2 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.