2006 Toyota Prius Problems

What owners report

The dominant theme among owners of this model year is HID headlights that cut out while driving, one side or both, and light up again after the switch is cycled off and on. Brake complaints also recur, mostly around a brake actuator or booster warning light and a pedal that feels soft or ineffective. Higher-mileage reports cover stalls, a vehicle that will not shut off, and a dash cluster that goes dark.

1. 1
   Exterior lighting

   HID headlights shut off while driving

   • 951 complaints (66%)
   • median 50,000 mi at 3.7 yrs old (860 state mileage)
   • 10 mention a crash, fire or injury
   • owner-quoted repair $500 (median of 237 quotes)
   • filed 2006–2025

   Owners describe one headlight, sometimes both, turning off without warning while the car is moving; cycling the light switch off and back on usually brings them back for a while before they drop out again. Complaints often note that dealers could not reproduce the fault or could not fix it reliably, and that bulb or assembly replacement is costly. Several owners say the dealer described it as a known problem on this model with HID lights. Mostly reported between about 10,000 and 60,000 miles, often within the first few years of ownership and at night.

   1 related service bulletin

   What to check: At night or in a garage, turn the lights on and watch both sides for flicker or dropouts, and cycle the switch to see whether the light comes back. Ask whether bulbs, ballasts or the lamp assembly have been replaced and whether the HID bulletin was addressed.

   2 excerpts from owner complaints in NHTSA records

   “Hid headlights on my 2006 Toyota Prius both failed within the time frame of 2 weeks. This left me with only partial view at night. Notably, Toyota has not taken action to correct what is now becoming a glaring design safety defect. The cost to repair these lights is astronomical and the dealers have been taking advantage of customers charging very high prices for the bulbs and the labor to replace them. …”

   NHTSA complaint #10275687, filed 2009-07, 64,425 miles

   “Headlights go off at random times mostly the right (passenger) side but it has happened on the driver side also. When this happens I have discovered that they come back on if I turn off the lights and then back on. After driving for a short time they start going off again or sometimes it will stay on until I don't need them. The next time I use the headlights they work fine for a few minutes and then it starts all over again. …”

   NHTSA complaint #10254669, filed 2009-01, 30,000 miles
2. 2
   Brakes

   Brake actuator / booster warning and weak pedal

   • 191 complaints (13%)
   • median 70,000 mi at 4.4 yrs old (155 state mileage)
   • 35 mention a crash, fire or injury
   • owner-quoted repair $2,500 (median of 26 quotes)
   • filed 2006–2026

   Complaints describe a brake pedal that goes near the floor or feels like the brakes are not engaging, sometimes with a buzzing or chirping noise from the brake unit and several dash warning lamps (brake, ABS, stability) lighting up. Owners report being told the brake actuator or accumulator assembly needs replacement, often at significant cost, and some mention a past warranty extension that has since expired. Mostly reported from roughly 90,000 to 250,000 miles, often noticed during routine driving and braking at low speed.

   2 related service bulletins

   What to check: Ask for any record of brake actuator or accumulator service and listen for a pump or buzzing noise with the car in ready mode. Confirm the brake, ABS and stability warning lamps go out after start-up and that the pedal holds firm under steady pressure.

   2 excerpts from owner complaints in NHTSA records

   “Frequently when the anti-lock brakes engage there seems to be uneven application that causes a slippage and the indicator light comes on. The vehicle seems to shudder and shimmy a bit making the braking seem like it is failing and increasing the braking distance. The vehicle has done this from day one and the dealer has assured me that it is normal. I have never had this happen with any other car I have had with anti-lock brakes.”

   NHTSA complaint #10331837, filed 2010-05, 32,000 miles

   “On tuesday, september 10, 2013 at about 8:10 a.m., I was driving on holcombe in houston. There was traffic. At one point, I needed to stop from a fairly low speed (perhaps 10 MPH), as the car in front of me had stopped for a light. I brake using the floor pedal. But the brakes did not engage at all; it was as though I had not even touched the brake. The car didn't hesitate or die; it just continued moving until it hit the car ahead of me. …”

   NHTSA complaint #10542886, filed 2013-09, 92,020 miles
3. 3
   Electrical system

   Dash cluster blank and car will not power off

   • 121 complaints (8%)
   • median 86,998 mi at 6.8 yrs old (101 state mileage)
   • 7 mention a crash, fire or injury
   • owner-quoted repair $1,115 (median of 25 quotes)
   • filed 2006–2026

   Owners report the combination meter going dark so speed, fuel and gear position cannot be read, and in some cases the car refusing to shut off when the power button is pressed, sometimes for hours. Complaints describe dealers either not reproducing the fault or declining repair because a prior coverage period had ended, and some note the car would not restart after a stall. Reported across a wide mileage range, from about 60,000 miles to well past 200,000.

   2 related service bulletins

   What to check: With the car in ready mode, confirm every gauge and the gear indicator illuminate and that the power button shuts the car down cleanly. Ask whether the combination meter or any related control module has been replaced or reprogrammed.

   2 excerpts from owner complaints in NHTSA records

   “Known problem with combination meter - found it searching online once I realized this was the problem. I bought my car used and since it is no longer covered by Toyota, it didn't come up in search. Having issues with there being no display on the dash and vehicle not shutting off for the entire time I have had the car. It only happens intermittently. This is a safety issue for sure! Can't see speed, gas, gears...anything about car whether car stationary or moving.”

   NHTSA complaint #11339333, filed 2020-07, 240,000 miles

   “According to the Toyota dealership where I have my car maintained, my 2006 Prius is in need of a new motherboard. Apparently there was a recall on this prior to so many miles on the vehicle but I have missed this deadline as my car did not show these symptoms prior to the cutoff.. My Prius when turned on does not turn on the dash board features so I have no idea how fast I am driving. Once I reach my destination I am unable to turn my car off. The power button does not respond, usually for several hours. …”

   NHTSA complaint #11319423, filed 2020-03, 202,000 miles
4. 4
   Engine

   Stall or loss of power while driving (hybrid system / water

   • 104 complaints (7%)
   • median 62,950 mi at 5.0 yrs old (84 state mileage)
   • 13 mention a crash, fire or injury
   • owner-quoted repair $600 (median of 10 quotes)
   • filed 2006–2025

   Complaints describe the car losing power or stalling at speed, sometimes regaining it briefly, and in some cases needing a tow. Owners report diagnosis of a faulty hybrid water pump or of battery and ignition coil faults, and one owner said the dealer stated the car was not covered by the inverter water pump recall campaign. Reported mostly above 130,000 miles.

   Recall 12V5360003 related service bulletins

   What to check: Ask whether the electric water pump and inverter cooling circuit have been serviced and whether recall 12V536000 was completed for this vehicle. Check for coolant residue near the pump and any stored hybrid system codes.

   2 excerpts from owner complaints in NHTSA records

   “I was driving on a highway 95 south, almost to delaware, at night in the rain, after 4 hours on the road, everything stopped working. I couldn't accelerate, I had no brakes, and eventually even my lights went out. The entire electrical system was out. I was in heavy traffic, and don't even know how I got off the highway, and to a gas station. The tow truck driver couldn't even jump the battery enough to get the car in neutral, and had a difficult time getting it up on the flatbed to tow it home. I couldn't even lock the doors. …”

   NHTSA complaint #11309040, filed 2020-02, 176,000 miles

   “The contact owns a 2006 Toyota Prius. The contact stated that while driving at an undisclosed speed, the vehicle lost power and immediately regained power. Approximately 24 hours later the check engine warning light illuminated. The vehicle was taken to an independent mechanic who diagnosed that the hybrid water pump was faulty and needed to be replaced. The vehicle was repaired. …”

   NHTSA complaint #11426460, filed 2021-07, 167,000 miles
5. 5
   Vehicle speed control

   Intermittent unintended acceleration reports

   • 244 complaints (17%)
   • median 46,800 mi at 3.8 yrs old (205 state mileage)
   • 23 mention a crash, fire or injury
   • owner-quoted repair $800 (median of 42 quotes)
   • filed 2006–2026

   A few owners describe the car accelerating on its own, in one case after crossing a rough railroad crossing and in another while parked in a garage, with braking needed to stop it. Complaints also mention floor mat interference concerns, which were the subject of a separate accelerator pedal campaign. Reported at low to mid mileages, from under 40,000 to about 170,000 miles, in varied conditions.

   Recall 09V388000

   What to check: Confirm the floor mat is the correct retained type and that recall 09V388000 was performed. Ask whether the pedal assembly or any throttle-related reprogramming has been done, and test that the pedal returns freely.

   2 excerpts from owner complaints in NHTSA records

   “Driving 2006 Prius 6/27/07 on rural 2 lane highway, crossed rough rail road crossing. Within 1/4 mile moved out to pass cyclists and as I cut back into my lane the car suddenly accelerated from 40 to 60 MPH in 3 seconds. Burned up brakes and started car fire getting car stopped. Towed to Toyota in wasau wisc. Brakes replaced but Toyota said it(sudden uncontrollable acceleration) had never happened before. Toyota wouldn't pay even though car was under warranty. Insurance paid. …”

   NHTSA complaint #10306839, filed 2010-02, 40,000 miles

   “The contact owns a 2006 Toyota Prius. The contact stated while she was sitting in the vehicle that was parked in the garage, the vehicle accelerated on its own and proceeded to move forward while the emergency brake was activated, and no warning light illuminated. The vehicle struck the contacts home going inside the home. The contact stated the vehicle was not on, but the vehicle started on its own once the vehicle was pulled from the inside of the home. …”

   NHTSA complaint #11488356, filed 2022-10, 168,000 miles

Buying note. Check the headlights thoroughly on a night drive, since that is the most frequent complaint for this model year, and ask for brake actuator service history as the car ages. Records showing the water pump and accelerator pedal recalls were completed are also worth confirming.

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.