2012 Toyota Prius V Problems

What owners report

Complaints about this model year center on the braking system, and in particular on the hydraulic brake booster/ABS actuator, which many owners say failed at well over 100,000 miles and left the pedal going to the floor. A smaller but steady group of reports covers engine overheating and head gasket work, plus occasional hybrid inverter failures that cause a stall or reduced power. Earlier-mileage reports tend to involve brake noise and rusted rear rotors rather than loss of braking.

1. 1
   Brakes

   Brake booster/ABS actuator failure, pedal to the floor

   • 107 complaints (49%)
   • median 113,000 mi at 8.5 yrs old (49 state mileage)
   • 4 mention a crash, fire or injury
   • owner-quoted repair $3,500 (median of 29 quotes)
   • filed 2013–2026

   Owners describe the brake pedal sinking to the floor, needing heavy pressure to stop, or braking assist dropping away while driving; some report multiple dash lights (ABS, brake, stability) coming on along with a whirring or cycling noise from the booster pump. According to complaints, dealers commonly diagnosed a leaking brake accumulator or failed booster/ABS actuator assembly and quoted repairs in the low thousands of dollars, and several owners say their vehicle was outside a customer support program that covered similar repairs on other Prius models. Mostly reported between roughly 90,000 and 180,000 miles, with a few at lower mileage.

   3 related service bulletins

   What to check: Ask whether the brake booster/accumulator or ABS actuator has been replaced, and request service records for it. Before buying, press the pedal at a stop and listen for frequent pump cycling or a hissing/whirring noise, and watch for brake, ABS or stability lights.

   2 excerpts from owner complaints in NHTSA records

   “Master cylinder failure that Toyota is aware of and should RECALL!!! I lost braking with my 10 year old son in the car and could have DIED!!!! Car has 62,000 miles on it! Ridiculous. Over 4,000$ to repair I’m being told. This is a significant Safety issue and you should make Toyota recall it!”

   NHTSA complaint #11483523, filed 2022-09, 62,000 miles

   “I was driving at night and several brake related dashboard lights suddenly lit up and I wasn’t able to use my brakes. I managed to coast safely to a stop, called a tow truck, and got my car home. Mechanic found a c1391 code and told me to go to Toyota. Toyota says the accumulator has a leak and it causes the brake up issue, but the service plan free program to fix it expired. They want $5000 to fix it. …”

   NHTSA complaint #11502967, filed 2023-01, 126,000 miles
2. 2
   Brakes

   Brakes release or lunge over bumps and potholes

   • 22 complaints (10%)
   • median 14,000 mi at 2.0 yrs old (19 state mileage)
   • 6 mention a crash, fire or injury
   • filed 2013–2025

   Owners describe the brakes momentarily letting go when the car is braking and passes over a bump, pothole or rough pavement, so the car seems to lunge forward and needs extra distance to stop. Some say the behavior has been present since the car was new and that dealers inspected the brakes, found nothing abnormal or called it normal for the regenerative system, and did not repair it. Reported from very low mileage (some within the first few thousand miles) through about 70,000 miles.

   What to check: During a test drive, brake gently while crossing a rough patch or speed bump and see whether the car feels like it surges. Ask the seller whether this has been reported and what the dealer said.

   2 excerpts from owner complaints in NHTSA records

   “On multiple occasions when braking if I hit a bump in the road or pothole the cars speeds forward for a few feet. It feels like the brakes release causing the car to stop slowing down. This is very discomforting. So far I have not been in any accident though I fear that this could contribute to an accident if I had to stop suddenly.”

   NHTSA complaint #10640938, filed 2014-10, 1,000 miles

   “When driving on uneven ground, like pot holes, the brakes fail. Literally if you have your foot on brake when driving over a pot hole, you can feel the brakes release and the car won't stop. I've had similar issues on bumpy ground. The car has always had the problem since I purchased it, probably on a weekly basis, and I've wondered about the safety and whether it's just related to ABS. I've also inquired at the dealership. Luckily, I've never been in an accident because of the problem. …”

   NHTSA complaint #10983184, filed 2017-05, 20 miles
3. 3
   Electrical system

   Hybrid inverter failure causing stall or power loss

   • 19 complaints (9%)
   • median 100,475 mi at 7.4 yrs old (13 state mileage)
   • filed 2015–2025

   Complaints describe sudden loss of power or a stall while driving, with the hybrid system warning lights on, the car limited to very low speed or unable to restart. According to the complaints, mechanics traced the problem to the inverter or intelligent power module, and some owners say their vehicle was not covered by an extended warranty or customer program for the part. Reported across a wide range, roughly 60,000 to 250,000 miles.

   Recall 18V684000Recall 15V4490007 related service bulletins

   What to check: Ask whether the inverter recall work was completed and whether any inverter or IPM repair has been done; a scan for stored hybrid codes before purchase is worthwhile.

   2 excerpts from owner complaints in NHTSA records

   “Toyota Prius V 2012 lost power as I was driving out of the parking lot. I had to make emergency stop on the side of the road because inverter/electric motor failed. Mechanic ran computer test and found that problem codes indeed pointed to failure of inverter.I called local dealer mccord Toyota and was told my car does not fall to extended warranty of inverter and did not offer any help. …”

   NHTSA complaint #11325497, filed 2020-05, 113,221 miles

   “Was driving down the street in my prius when all of a sudden the car went totally dead. It did not go into a limp-home mode. I was dead in the water in the middle of a street all of a sudden. We had to get out and push it out of the street. Mechanic says its a known issue with prius and inverter. That was pretty dangerous and I was glad we werent on the freeway. We were unaware of any recall. The car went into disco mode - every warning light it had was on and blinking but the car was completely dead.”

   NHTSA complaint #11144597, filed 2018-10, 130,000 miles
4. 4
   Brakes

   Rear brake noise and rusted rotors/pads

   • 33 complaints (15%)
   • median 57,000 mi at 6.3 yrs old (21 state mileage)
   • 1 mention a crash, fire or injury
   • owner-quoted repair $3,500 (median of 7 quotes)
   • filed 2013–2026

   Complaints describe groaning, howling or scraping noises from the rear brakes, often loudest in the morning or just before the car comes to a full stop. Several owners say dealers attributed the noise and rapid wear to rust on the rotors, and one reported rear pads worn to 1 mm with rusted rotors at about 40,000 miles while the front brakes were still in good condition. Reported from a few thousand miles up to about 55,000 miles, often after sitting or in damp conditions.

   4 related service bulletins

   What to check: Look at the rear rotors for heavy rust or scoring and ask when the rear pads were last replaced; a short test drive with the windows down will reveal groaning or scraping.

   2 excerpts from owner complaints in NHTSA records

   “When you start to drive it makes a loud howling sound, it is getting louder as time goes on. People look at us like we are crazy for driving with bad brakes. We have had it in to the dealer many times to just be told it is the way it is. No repair is necessary. It is getting more and more annoying to listen to. It lasts longer as time goes on. Come on Toyota lets get this taken care of before there is a fatal collision due to this! It is getting scary to drive and feel safe.”

   NHTSA complaint #10502344, filed 2013-03, 300 miles

   “Loud scraping noise coming from rear of car---had the car in to Toyota 5 times. The noise continues to get louder as time passes.-- its now loud enough to drown out the radio.--Toyota service says it is just rust on the rotors.--this is the 4th new Toyota I have owned,-- but this the only one I have ha d this problem with.-- which leads me to believe that there is a fix for this problem.--ii was told by the service manager that Toyota knows of this problem and are working a recall to fix it.---so where is the recall??????”

   NHTSA complaint #10501305, filed 2013-03, 4,000 miles
5. 5
   Engine

   Overheating and head gasket failure

   • 11 complaints (5%)
   • median 149,000 mi at 8.4 yrs old (8 state mileage, few)
   • filed 2019–2024

   Owners report temperature and check engine lights, coolant loss from the reservoir, rough running or shaking, and in some cases a stall; shops diagnosed a failed head gasket and, in some reports, a clogged EGR cooler as contributing. Complaints describe repair estimates around $3,000 and up, and some owners say the vehicle had been maintained regularly before the failure. Mostly reported from about 120,000 miles upward.

   What to check: Check the coolant level and look for residue or low coolant in the reservoir, and ask whether a head gasket, water pump or EGR cooler has already been serviced. Watch for a rough idle or white exhaust on start-up.

   2 excerpts from owner complaints in NHTSA records

   “My Toyota Prius V only has 121,153 miles on it and during a short drive to work where we never reached speeds over 50mphs our Prius V overheated causing a blown head gasket and all sorts of combustion issues. The repairs were $3000. This is a 2nd family car which has always been maintained by expert, license auto mechanics. This should never happen on a car with such low milage! I have learned that this is a common issues with this Toyota prius model and Toyota should file a recall and fix the overheating issues.”

   NHTSA complaint #11407218, filed 2021-04, 121,140 miles

   “1)intermittent regen braking failure causing brakes to become more difficult to press thus harder to stop the car in a timely manner. Usually when there is stop and go driving will the regenerative braking fail. 2) clogged EGR valve causing a loud engine knock resulting in a blown head gasket.”

   NHTSA complaint #11320724, filed 2020-04, 150,000 miles

Buying note. Check the brake system carefully on this model year: a pre-purchase inspection that includes the booster and actuator, plus service records showing whether related repairs or programs were applied, matters more here than cosmetics. Ask about the inverter recalls and confirm coolant maintenance, since engine overheating and head gasket repairs show up on higher-mileage examples.

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.