Is head gasket failure requiring engine replacement a known issue with the 2012 Toyota Prius?

5 NHTSA complaints have been filed about head gasket failure requiring engine replacement on the 2012 Toyota Prius (2023-04 → 2024-03). Reported component: ENGINE. From an owner report (NHTSA ODI #11557495): "Had blown gasket repair last year (which was fixed by my local Toyota Dealership and all cost paid for by myself). Dealership acknowledged that there were known issues with failures due to clogged EGR's and out-dated manifolds" Source: NHTSA.

Is rear suspension corrosion leading to wheel separation a known issue with the 2012 Toyota Prius?

3 NHTSA complaints have been filed about rear suspension corrosion leading to wheel separation on the 2012 Toyota Prius (2024-07 → 2025-12). Reported component: SUSPENSION. From an owner report (NHTSA ODI #11704752): "The contact owns a 2012 Toyota Prius. The contact stated that while reversing, the driver's side rear wheel flipped over. The vehicle was towed to the dealer, where it was diagnosed with a corroded I-Beam assembly on the rear wheel" Source: NHTSA.

Is brake booster and actuator accumulator failure a known issue with the 2012 Toyota Prius?

163 NHTSA complaints have been filed about brake booster and actuator accumulator failure on the 2012 Toyota Prius (2022-09 → 2026-07). Reported component: SERVICE BRAKES. From an owner report (NHTSA ODI #11740616): "Almost had an accident due to the brake master, actuator and booster pump assemblies, failing. There were no warning lights alerting me to an issue. Just lost ability to break and car shut off completely while in motion" Source: NHTSA.

Is hybrid propulsion power loss tied to recall 18v684000 a known issue with the 2012 Toyota Prius?

7 NHTSA complaints have been filed about hybrid propulsion power loss tied to recall 18v684000 on the 2012 Toyota Prius (2022-10 → 2025-11). Reported component: HYBRID PROPULSION SYSTEM. From an owner report (NHTSA ODI #11680736): "The contact owns a 2012 Toyota Prius. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended" Source: NHTSA.

2012 Toyota Prius Recalls, Issues & Maintenance

Q: Is low-beam headlight failure a known issue with the 2012 Toyota Prius?

3 NHTSA complaints have been filed about low-beam headlight failure on the 2012 Toyota Prius (2022-12 → 2023-02). Reported component: EXTERIOR LIGHTING. From an owner report (NHTSA ODI #11506600): "The contact owns a 2012 Toyota Prius. The contact stated that the passenger's side low-beam headlight failed to provide adequate illumination while driving. The vehicle was taken to the dealer who informed the contact that no issues were found" Source: NHTSA.

The 2012 Toyota Prius carries 6 open NHTSA recalls — most recently covering hybrid propulsion system and side/window. Owners report 5 recurring issue clusters, led by “Head gasket failure requiring engine replacement.” Toyota's owner's manual splits service into Schedule 1 (severe) and Schedule 2 (normal). Most US drivers fall under Schedule 1 because it covers short trips, extreme temperatures, dusty roads, or heavy idling. The intervals below reflect Schedule 1 — the schedule Toyota recommends for typical real-world use.

6 Open Recalls

Source: NHTSA

HYBRID PROPULSION SYSTEM

Campaign #18V684000 · Apr 10, 2018

Issue: Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2010-2014 Toyota Prius and 2012-2014 Toyota Prius V vehicles. Excessive voltage in the Intelligent Power Module (IPM) within the inverter may cause the hybrid system to shut down, causing the vehicle to stall while being driven.

Risk: If the hybrid system shuts down unexpectedly, it can increase the risk of a crash.

Fix: Toyota will notify owners, and dealers will update the software for the motor/generator control electronic control unit (ECU) and the hybrid control ECU as necessary, free of charge. The recall began January 22, 2019. Owners may contact Toyota customer service at 1-888-270-9371. Toyota's number for this recall is J0V. Note: The software updates in this recall are needed even if the vehicle had the software previously updated under recalls 14V-053 or 15V-449.

AIR BAGS:SIDE/WINDOW

Campaign #16V487000 · Jun 30, 2016

Issue: Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2010-2012 Toyota Prius, 2010 and 2012 Toyota Prius Plug-in Hybrid, and 2011-2012 Lexus CT200h vehicles. A weld in the curtain shield air bag inflator may crack causing one or both portions of the inflator to eject into the passenger cabin.

Risk: If either portion of the curtain shield air bag inflator ejects into the passenger cabin, there is an increased risk of injury to vehicle occupants.

Fix: Toyota will notify owners, and dealers will install retention brackets to the curtain shield air bags, free of charge. The recall began on October 17, 2016. Owners may contact Toyota Customer Service Department at 1-800-331-4331. Toyota's number for this recall is Toyota G0U, and Lexus GLJ.

HYBRID PROPULSION SYSTEM: INVERTER

Campaign #14V053000 · Dec 2, 2014

Issue: Toyota is recalling certain model year 2010 through 2014 Prius vehicles. In the affected vehicles, the Intelligent Power Module (IPM) inside the inverter module (a component of the hybrid system) contains transistors that may become damaged from high operating temperatures. If this occurs, various warning lamps will be illuminated on the instrument panel and the vehicle will have reduced power allowing it to only drive a short distance.

Risk: The vehicle may enter a fail-safe/limp-home mode that limits the drivability of the vehicle. The hybrid system could also shut down completely resulting in a vehicle stall, increasing the risk of a crash.

Fix: Toyota will notify owners and dealers will update the software for both the motor/generator control electronic control unit (ECU) and the hybrid control ECU, free of charge. If an owner experiences a failure of the inverter before the vehicle receives updated software, the dealer will repair or replace the inverter assembly with a new one at no charge. The recall began on March 21, 2014. Owners may contact Toyota at 1-800-331-4331.

SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER

Campaign #16V396000 · Feb 6, 2016

Issue: Southeast Toyota Distributors, LLC (SET) is recalling certain 2005-2011 4Runner, Highlander, Sequoia, and Sienna, 2005-2010 Avalon and Tundra, 2006-2008 Camry Solara, 2006-2010 Highlander hybrid, 2006-2011 Rav4 and Tacoma, 2007-2010 FJ Cruiser, 2007-2011 Camry hybrid, 2009-2010 Venza, 2010-2012 Prius, 1988-1990 and 2005-2010 Camry, and 1989 and 2009-2010 Corolla vehicles equipped with aftermarket accessory seat heaters with a copper strand heating element. The electrical wiring in the seat heaters may be damaged when the seat cushion is compressed.

Risk: If damaged, the copper strand heating element may short circuit, increasing the risk of a fire.

Fix: SET will notify owners, and dealers will disconnect the seat heaters, free of charge, and refund the purchase price of the seat heater accessory. The recall began on July 14, 2016. Owners may contact SET customer service at 1-866-405-4226. SET number for this recall is SET16B.

AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE-INACTIVE

Campaign #13V014000 · Jan 16, 2013

Issue: Southeast Toyota Distributors, LLC (SET) is recalling certain models interspersed through model years 2009 through 2013 as follows: model year 2009-2012 Tacoma, 4Runner, Camry, Camry Hybrid, Prius, and RAV4; model year 2009-2010 Avalon, FJ Cruiser, and Highlander Hybrid; model year 2010-2013 model year Corolla, Sienna and Tundra; model year 2009-2013 Highlander and Venza; model year 2012 Prius V; and model year 2010-2012 Sequoia. During modification by SET to include accessories such as leather seat covers, seat heaters or headrest DVD systems, these vehicles may not have had the passenger seat occupant sensing system calibration tested. Without passing the calibration test, the occupant sensing system may not operate as designed.

Risk: If the front passenger seat occupant sensing system is out of calibration, the front passenger airbags may not deploy or they may deploy inappropriately for the passenger's size and position. This could increase the risk of personal injury during the event of a vehicle crash necessitating airbag deployment.

Fix: Southeast Toyota will notify owners, and dealers will test the sensitivity of the occupant detection sensors, and recalibrate them as necessary. The recall began on March 21, 2013. Owners may contact Southeast Toyota at 1-800-301-6859.

EQUIPMENT:OTHER:LABELS

Campaign #13V123000 · Sep 4, 2013

Issue: Southeast Toyota is recalling certain model year 2008 and 2010-2013 Toyota Tundra, 2010-2012 Rav4, 2012 Toyota Sequoia, 2010-2011 Toyota Corolla, 2010-2011 Toyota Camry and Camry Hybrid, 2010-2013 Toyota Highlander and Highlander Hybrid, 2010-2013 Toyota FJ Cruiser, 2011 Toyota Land Cruiser, 2010-2013 Toyota Venza, 2010-2011 Toyota 4Runner, 2010-2013 Toyota Tacoma, 2011-2012 Toyota Sienna, 2012 Toyota Prius, 2013 Scion FR-S, 2011 Scion XD, 2011 Scion XB, and 2012 Scion TC vehicles. These vehicles were sold with labels that were outside the allowable one percent of accuracy of actual weight added. Thus, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) Number 110, "Tire Selection and Rims."

Risk: An inaccurate label could lead to owners overloading their vehicles and tires. An overloaded vehicle can result in a tire failure which may result in a vehicle crash, personal injury, or property damage.

Fix: Southeast Toyota will notify owners and provide a corrected label with instructions concerning its installation. A small group of the affected vehicles will need additonal remedies which are still being developed. The recall began on May 28, 2013. Owners may contact Southeast Toyota at 1-800-301-6859.

Recall data refreshed Sep 6, 2026.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2012 Toyota Prius.

1 active NHTSA investigation

Source: NHTSA

Brake Actuator Valve Wear
Action #DP23005 · opened Nov 22, 2023
The Office of Defects Investigation (ODI) has received a petition dated September 19, 2023 from the owner of a 2012 Toyota Prius V requesting that ODI reevaluate its decision to deny DP19-004. In the letter, the petitioner reported experiencing an unexpected and complete loss of…
View on NHTSA →

Reported to NHTSA

Head gasket failure requiring engine replacement

ENGINE

5 NHTSA complaints · 2023-04 → 2024-03

“Had blown gasket repair last year (which was fixed by my local Toyota Dealership and all cost paid for by myself). Dealership acknowledged that there were known issues with failures due to clogged EGR's and out-dated manifolds”
— Owner report, NHTSA ODI #11557495

“the car was serviced regularly and for unknown reason the engine started running rough. I took it the mechanic and after completing a diagnostic test he said i have a blown had gasket in the engine”
— Owner report, NHTSA ODI #11516166

“The contact owns a 2012 Toyota Prius. The contact stated that when the vehicle was started, there was a rattling sound coming from the vehicle. The contact stated that while depressing the accelerator pedal, the vehicle started shaking abnormally with a rattling sound”
— Owner report, NHTSA ODI #11576654

Read all complaints on NHTSA →

Rear suspension corrosion leading to wheel separation

SUSPENSION

3 NHTSA complaints · 2024-07 → 2025-12

“The contact owns a 2012 Toyota Prius. The contact stated that while reversing, the driver's side rear wheel flipped over. The vehicle was towed to the dealer, where it was diagnosed with a corroded I-Beam assembly on the rear wheel”
— Owner report, NHTSA ODI #11704752

“2012 Prius in very good condition with 180k miles- only 12 years old. Driving on back roads (thankfully) and the drivers side rear wheel compelely fell off while driving”
— Owner report, NHTSA ODI #11634157

“On 07-June-2024 @14:47 my 2012 Toyota Prius suffered a catastrophic failure. I was attempting to back my 2012 Toyota Prius vehicle a few meters back into my driveway while turning slightly. This was a very slow speed backup”
— Owner report, NHTSA ODI #11601457

Read all complaints on NHTSA →

Low-beam headlight failure

EXTERIOR LIGHTING

3 NHTSA complaints · 2022-12 → 2023-02

“The contact owns a 2012 Toyota Prius. The contact stated that the passenger's side low-beam headlight failed to provide adequate illumination while driving. The vehicle was taken to the dealer who informed the contact that no issues were found”
— Owner report, NHTSA ODI #11506600

“Purchased 2012 Prius used. Replaced low beams and high beam headlights shortly after. Passenger side low beam is no longer working (bulb was replaced 3 months ago)”
— Owner report, NHTSA ODI #11496959

“The headlight lens of my car became increasingly fogged, overtime, decreasing night visibility ahead. The Toyota dealership offered a $300 cleaning service for both lenses or replacing the headlamp at about $300 each; $600”
— Owner report, NHTSA ODI #11499725

Read all complaints on NHTSA →

Brake booster and actuator accumulator failure

SERVICE BRAKES

163 NHTSA complaints · 2022-09 → 2026-07

“Almost had an accident due to the brake master, actuator and booster pump assemblies, failing. There were no warning lights alerting me to an issue. Just lost ability to break and car shut off completely while in motion”
— Owner report, NHTSA ODI #11740616

“Completely lost vacuum brake assist without any prior warning, while driving on the interstate. Got warning lights on the dash for brake and ABS, when it happened. Fortunately there was little traffic, but if there had been even moderate traffic, it could have caused a crash”
— Owner report, NHTSA ODI #11594703

“Brake lights icons stay on mechanic at Toyota dealership state need new brak master cylinder and booster”
— Owner report, NHTSA ODI #11751225

Read all complaints on NHTSA →

Hybrid propulsion power loss tied to recall 18V684000

HYBRID PROPULSION SYSTEM

7 NHTSA complaints · 2022-10 → 2025-11

“The contact owns a 2012 Toyota Prius. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended”
— Owner report, NHTSA ODI #11680736

“The hybrid system was shut down while driving. The symptoms are like the description in this recall (NHTSA Campaign Number: 18V684000). However, my VIN is not on the recall list”
— Owner report, NHTSA ODI #11569382

“I am having issues with my Toyota I was never contacted NHTSA CAMPAIGN ID: 18V684000. My car has failed numerous times”
— Owner report, NHTSA ODI #11500728

Read all complaints on NHTSA →

Note: NHTSA also opened 2 defect investigation(s) on this vehicle that closed without action.

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 11, 2026. Investigation data refreshed Sep 11, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Essential maintenance

Critical for safety and preventing major damage

Engine Oil & Filter

Every 5,000 mi

Replace 0W-20 full-synthetic oil and filter every 5,000 miles under Schedule 1, or 10,000 miles under Schedule 2. Toyota covers the first 2 oil changes through ToyotaCare.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

Tire Rotation

Every 5,000 mi

Rotate tires every 5,000 miles. Toyota recommends rotation at every oil change to maximize tire life on FWD and AWD models.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

Brake Inspection

Every 5,000 mi

Inspect brake pads, rotors, and parking brake every 5,000 miles. Toyota recommends measuring pad thickness at each service.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

Brake Fluid

Every 30,000 mi

Replace DOT 3 brake fluid every 30,000 miles or 36 months. Critical for the integrity of the ABS, VSC, and brake assist systems.

Extends the life of your vehicle and improves comfort

Cabin Air Filter

Every 30,000 mi

Replace the cabin air filter every 30,000 miles, sooner in dusty climates. Located behind the glove box on most Toyota and Lexus models.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

Serpentine / Drive Belt Inspection

Every 60,000 mi

Inspect the serpentine belt and tensioner every 60,000 miles. Toyota uses long-life EPDM belts that rarely fail before 100,000 miles.

Estimated cost — typical U.S. ranges

Dealer

~$195–$235

Shop

~$135–$165

DIY

~$20–$50

DIY-friendly if you can reach the tensioner. Inspect for cracks rather than swap on a strict mileage interval.

Timing Chain — No Replacement

On condition / lifetime

Toyota's 2AR-FE, 2GR-FKS, A25A-FKS, and most Toyota engines built since 2010 use a timing chain rated for the life of the engine. No scheduled replacement.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Pro only

Timing chains are normally lifetime. Listen for rattle on cold start — that's the actionable signal. Replacement is major work, quote separately.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

127 crashes 2010–2024

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

complaints mentioning a crash

complaints mentioning a fire

Reviewed known issues for this vehicle·Open recalls for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2012 Toyota Prius reflects Toyota's published service intervals and the Maintenance Required Light system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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