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 2010-2015 Toyota Prius Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391)?

The electro-hydraulic brake booster/accumulator assembly on third-generation Prius develops an internal fluid leak, so the accumulator can no longer hold pressure. The pump then runs constantly to keep pressure up (loud buzzing/grinding from under the driver's footwell) and event… Repairs typically run $1,800-$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 2010-2018 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 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 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.

Toyota · Known Issues

2014 Toyota Prius Problems: 9 Known Issues

2014 model year · 6,280+ owner reports · Updated September 2026

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According to Au7o's analysis of 6,280+ owner reports, the 2014 Toyota Prius has 9 documented known issues, with 6 rated critical. The most serious are Hybrid Battery Pack (HV Battery) Failure ($1,200-$3,500 repair), 3rd Generation 2ZR-FXE Excessive Oil Consumption ($0-$3,500 repair), Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C) ($250-$800 repair), 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) and Catalytic Converter Theft Vulnerability ($150-$3,000 repair). The most commonly reported issue is Hybrid Battery Pack (HV Battery) Failure with 4,500 owner reports. Across all issues with published estimates, repair costs range from $150 to $5,000. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Toyota Prius problems?

According to Au7o's analysis of 6,280+ owner reports, the 2014 Toyota Prius has 9 documented issues. The most frequently reported are: Hybrid Battery Pack (HV Battery) Failure, 3rd Generation 2ZR-FXE Excessive Oil Consumption, Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C). Of these, 6 are rated critical and should be addressed promptly.

Is the Toyota Prius reliable?

The 2014 Toyota Prius has 9 known issues documented across 6,280+ owner reports. 6 issues are rated critical: Hybrid Battery Pack (HV Battery) Failure and 3rd Generation 2ZR-FXE Excessive Oil Consumption and Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C) and Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391) and Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall and Catalytic Converter Theft Vulnerability. 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 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 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.

All 9 Known Issues

Other Toyota Models

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

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

2004-2015 Toyota Prius: Hybrid Battery Pack (HV Battery) Failure#

2010-2015 Toyota Prius: Inverter Intelligent Power Module (IPM) Overheating and Hybrid System Stall#

2004-2025 Toyota Prius: 12V Auxiliary Battery Drain and Failure#

2010-2015 Toyota Prius: 3rd Generation 2ZR-FXE Excessive Oil Consumption#

2010-2018 Toyota Prius: EGR Valve and Intake Manifold Carbon Buildup#

2010-2015 Toyota Prius: Electric Engine Coolant Pump Failure Causing Overheat Shutdown (P261B / P261C)#

2010-2015 Toyota Prius: Brake Booster and Brake Booster Pump Assembly Internal Leak (DTC C1391)#

2004-2025 Toyota Prius: Catalytic Converter Theft Vulnerability#

2004-2015 Toyota Prius: Hybrid Transaxle Motor-Generator Bearing Whine and Transaxle Failure#