What is the 2004-2015 Toyota Prius Hybrid Battery Pack (HV Battery) Failure?

Gen 2 (2004-2009) and Gen 3 (2010-2015) Prius NiMH battery packs commonly fail between 8-15 years. Individual cell degradation causes voltage imbalances, triggering warning lights and reduced performance. Battery cooling fan clogging accelerates failure. Repairs typically run $1,200-$3,500. Severity: high.

What is the 2004-2009 Toyota Prius Inverter Coolant Pump Failure?

The electric inverter coolant pump (G9020-47031) on Gen 2 Prius fails without warning, causing the inverter to overheat. If not caught quickly, overheating can destroy the inverter assembly ($3,000+ repair). Pump typically fails between 100,000-180,000 miles. Repairs typically run $200-$600. Severity: high.

What is the 2004-2009 Toyota Prius 1NZ-FXE Head Gasket Failure and EGR Cooler Issues?

The 1.5L 1NZ-FXE engine can develop head gasket failure allowing coolant and oil mixing, often linked to EGR cooler problems that cause localized hot spots. Typically appears after 150,000+ miles. External coolant leaks may also occur at the head gasket mating surface. Repairs typically run $1,200-$2,500. Severity: high.

What is the 2010-2015 Toyota Prius 3rd Generation 2ZR-FXE Excessive Oil Consumption?

The 3rd generation Prius with the 2ZR-FXE engine consumes excessive oil, often burning 1 quart every 1,000-2,000 miles. The root cause is defective piston rings that do not properly seal against the cylinder walls. Toyota extended the warranty to 10 years/150,000 miles for affect… Repairs typically run $0-$3,500. Severity: high.

What is the 2010-2015 Toyota Prius Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall?

Transistors inside the Intelligent Power Module of the inverter/converter assembly can overheat and fail under sustained high load (long grades, hard acceleration, hot weather). When the module faults, the hybrid system shuts down and the car can stall at speed, sometimes without… Repairs typically run $2,500-$5,000. Severity: high.

What is the 2004-2025 Toyota Prius Catalytic Converter Theft Vulnerability?

The Toyota Prius is the single most targeted vehicle for catalytic converter theft in the United States. The Prius catalytic converter contains higher concentrations of precious metals (palladium, rhodium, platinum) than most vehicles because the hybrid system results in a cleane… Repairs typically run $150-$3,000. Severity: high.

What is the 2010-2015 Toyota Prius Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C)?

Unlike a belt-driven pump, the 2ZR-FXE engine coolant pump is a brushless electric unit commanded by duty cycle from the ECM. The internal motor/controller degrades and the pump slows or stops, so coolant stops circulating through the engine. The ECM detects the speed feedback fa… Repairs typically run $250-$800. Severity: high.

What is the 2010-2018 Toyota Prius EGR Valve and Intake Manifold Carbon Buildup?

Gen 3 and Gen 4 Prius models develop heavy carbon buildup in the EGR valve and intake manifold, causing rough idle, misfires, and reduced performance. The Atkinson-cycle engine's low combustion temperatures promote carbon accumulation in the EGR system. Repairs typically run $200-$800. Severity: medium.

What is the 2016-2018 Toyota Prius Fourth-Generation Windshield Cracking From Minor Impacts or No Impact At All?

XW50 Prius owners report windshields developing long cracks from pebble-sized strikes that would not damage other cars, and in many reports with no impact at all - a crack appearing after sun exposure or a cold morning and then growing several inches a day across the driver's fie… Repairs typically run $400-$1,600. Severity: medium.

What is the 2023-2025 Toyota Prius Reverse Camera Image Freezes or Goes Blank From Parking Assist Software Error (Recall 25V744000)?

NHTSA recall 25V744000 includes 2023-2025 Toyota Prius hybrids built with the Panoramic View Monitor system. Toyota identified a software error that can freeze the rearview camera image or leave the screen blank when the Prius is shifted into reverse, which places the car outside… Severity: medium.

What is the 2004-2025 Toyota Prius 12V Auxiliary Battery Drain and Failure?

The 12V auxiliary battery in the Prius is critical for powering the vehicle computer systems that must boot up before the hybrid system can start. Unlike conventional cars where a weak battery can still crank the engine, a dead 12V battery in the Prius means the vehicle will not… Repairs typically run $150-$300. Severity: medium.

What is the 2006-2009 Toyota Prius HID Headlight Intermittently Shuts Off While Driving (Bulb and HID ECU/Ballast)?

On XW20 Prius equipped with factory HID (xenon) headlamps, one or both low beams flicker, cut out while driving, and often will not restrike until the lights are cycled - leaving the driver with no low beam at night. The failure is normally the aged D4R HID bulb (as gas pressure… Repairs typically run $150-$900. Severity: medium.

What is the 2004-2009 Toyota Prius Coolant Flow Control (Three-Way) Valve Sticking on XW20 (DTC P1121)?

The 2004-2009 Prius uses a coolant heat-storage tank and an electrically actuated three-way coolant flow control valve that routes coolant between engine, storage tank and heater core to cut cold-start emissions and warm the cabin quickly. The valve motor or its position sensor f… Repairs typically run $350-$1,000. Severity: medium.

What is the 2004-2015 Toyota Prius Hybrid Transaxle Motor-Generator Bearing Whine and Transaxle Failure?

High-mileage Prius eCVT transaxles develop a speed-dependent whine or groan from failing MG1/MG2 support bearings and worn reduction gears; in the worst cases metal debris or a motor-generator fault trips the hybrid system with codes such as P0A92, P0A7A or an isolation fault (P0… Repairs typically run $1,200-$4,000. Severity: medium.

What is the 2004-2009 Toyota Prius Second-Generation Combination Meter Failure (Blank or Dead Speedometer Display)?

The vacuum-fluorescent combination meter on XW20 Prius loses segments or goes completely blank, taking the speedometer, fuel gauge and shift indicator with it. Failure is traced to cracked solder joints and failing capacitors/driver components on the meter board, aggravated by da… Repairs typically run $150-$1,500. Severity: medium.

What is the 2023-2024 Toyota Prius Prius and Prius Prime: Incorrect Load Capacity Modification Label (GST Recall 24V548000)?

Gulf States Toyota included the 2023-2024 Toyota Prius and Prius Prime in recall 24V548000. Affected cars are those fitted with GST accessories, where the load carrying capacity modification label may display inaccurate added weight values. That sticker is the owner's only record… Severity: low.

Toyota · Known Issues

2004-2026 Toyota Prius Problems: 19 Known Issues

2004-2026 model years · 9,360+ owner reports · Updated August 2026

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According to Au7o's analysis of 9,360+ owner reports, the 2004-2026 Toyota Prius has 19 documented known issues, with 10 rated critical. The most serious are Hybrid Battery Pack (HV Battery) Failure ($1,200-$3,500 repair), Inverter Coolant Pump Failure ($200-$600 repair), 1NZ-FXE Head Gasket Failure and EGR Cooler Issues ($1,200-$2,500 repair), 3rd Generation 2ZR-FXE Excessive Oil Consumption ($0-$3,500 repair), Recall 06V096000: Side, Curtain and Knee Air Bag Inflator Defect on 2004-2006 Prius, Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391) ($1,800-$3,500 repair), Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall ($2,500-$5,000 repair), Rear Door Opener Switch Water Intrusion Allowing Doors to Open While Driving (Recalls 24V274 / 26V049) ($0-$0 repair), Catalytic Converter Theft Vulnerability. at .

Frequently Asked Questions

What are the most common Toyota Prius problems?

According to Au7o's analysis of 9,360+ owner reports, the 2004-2026 Toyota Prius has 19 documented issues. The most frequently reported are: Hybrid Battery Pack (HV Battery) Failure, Inverter Coolant Pump Failure, 1NZ-FXE Head Gasket Failure and EGR Cooler Issues. Of these, 10 are rated critical and should be addressed promptly.

Is the Toyota Prius reliable?

The 2004-2026 Toyota Prius has 19 known issues documented across 9,360+ owner reports. 10 issues are rated critical: Hybrid Battery Pack (HV Battery) Failure and Inverter Coolant Pump Failure and 1NZ-FXE Head Gasket Failure and EGR Cooler Issues and 3rd Generation 2ZR-FXE Excessive Oil Consumption and Recall 06V096000: Side, Curtain and Knee Air Bag Inflator Defect on 2004-2006 Prius and Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391) and Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall and Rear Door Opener Switch Water Intrusion Allowing Doors to Open While Driving (Recalls 24V274 / 26V049) and Catalytic Converter Theft Vulnerability and Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Toyota Prius problems?

Repair costs for known Toyota Prius issues range from $0 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Hybrid Battery Pack (HV Battery) Failure, typically costs $1,200-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Toyota Prius is the most reliable?

Reliability varies across model years of the Toyota Prius. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2004-2026 Toyota Prius with 19 documented issues documented across 9,360+ owner reports.

All 19 Known Issues

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Frequently Asked Questions

What are the most common Toyota Prius problems?

Is the Toyota Prius reliable?

How much does it cost to fix common Toyota Prius problems?

What year Toyota Prius is the most reliable?

Hybrid Battery Pack (HV Battery) Failure#

Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall#

12V Auxiliary Battery Drain and Failure#

HID Headlight Intermittently Shuts Off While Driving (Bulb and HID ECU/Ballast)#

Second-Generation Combination Meter Failure (Blank or Dead Speedometer Display)#

Recall 06V096000: Side, Curtain and Knee Air Bag Inflator Defect on 2004-2006 Prius#

Rear Door Opener Switch Water Intrusion Allowing Doors to Open While Driving (Recalls 24V274 / 26V049)#

Reverse Camera Image Freezes or Goes Blank From Parking Assist Software Error (Recall 25V744000)#

Prius and Prius Prime: Incorrect Load Capacity Modification Label (GST Recall 24V548000)#

Inverter Coolant Pump Failure#

Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C)#

Coolant Flow Control (Three-Way) Valve Sticking on XW20 (DTC P1121)#

1NZ-FXE Head Gasket Failure and EGR Cooler Issues#

3rd Generation 2ZR-FXE Excessive Oil Consumption#

EGR Valve and Intake Manifold Carbon Buildup#

Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391)#

Catalytic Converter Theft Vulnerability#

Fourth-Generation Windshield Cracking From Minor Impacts or No Impact At All#

Hybrid Transaxle Motor-Generator Bearing Whine and Transaxle Failure#