You can find common Toyota Prius fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
Search Toyota Prius Codes
Do you know the fault code already? Enter it in the box below and hit "Search Codes".
Toyota Prius Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Toyota Prius has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Toyota Prius Recalls »
Common Prius Fault Codes
These are the most common Prius fault codes that people are searching for.
Engine Coolant Temperature Circuit Low InputLearn More
Heated Oxygen Sensor (HO2S) Heater Circuit High Voltage Bank 1 Sensor 2Learn More
Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 2Learn More
Manifold Absolute Pressure/Barometric Pressure Circuit High InputLearn More
Throttle position (TP) sensor/mass air flow (MAF) sensor – implausible signalLearn More
Engine coolant temperature (ECT) sensor – signal out of rangeLearn More
Air/Fuel Sensor Circuit Range/Performance. (Bank 1 Sensor 2)Learn More
Accelerator pedal position (APP) sensor 1 – signal voltage lowLearn More
A/C Evaporator Air Temperature Circuit HighLearn More
Lack Of HO2S21 Switch - Sensor Indicates LeanLearn More
Evap Emission Control Sys Leak Detected (Gross Leak/No Flow)Learn More
Lamp Turn Signal Front Output Circuit Short To GroundLearn More
ABS Hydraulic Pressure Differential Switch Input Short Circuit To GroundLearn More
Igniter Circuit Malfunction - No. 2.Learn More
Accelerator pedal position (APP) sensor 1 – signal voltage highLearn More
Lost Communication With Drive Motor Control ModuleLearn More
Passenger Power Window Motor Circuit Short To GroundLearn More
Wiper Rear High Limit Input Circuit FailureLearn More
Wiper Rear Motor Up Relay Coil Circuit Short To GroundLearn More
Lamp Backup Switch Input Circuit OpenLearn More
Lamp Turn Signal Front Output Circuit Short To BatteryLearn More
ABS Outlet Valve Coil RR Circuit Short To GroundLearn More
ABS Outlet Valve Coil RR Circuit FailureLearn More
ABS Inlet Valve Coil LF Circuit Short To GroundLearn More
Damper LR Circuit FailureLearn More
ABS Outlet Valve Coil Rear Circuit OpenLearn More
Code Word UnregesteredLearn More
Torque Converter Clutch Circuit Performance or Stuck OffLearn More
Exhaust Camshaft Position Timing - Over-Retarded (Bank 1)Learn More
Transmission control module (TCM) – EEPROM malfunctionLearn More
Throttle Pedal Position Sensor/Switch A Circuit MalfunctionLearn More
Yaw Rate Sensor Signal FaultLearn More
Input/Turbine Speed Sensor Circuit No SignalLearn More
Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)Learn More
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)Learn More
Lost Communication With Brake System Control ModuleLearn More
Lost Communication With Anti-Lock Brake System (ABS) Control ModuleLearn More
Lost Communication With ECM/PCM "B"Learn More
Lost Communication with Fuel Pump Control Module (FPCM)Learn More
Lost Communication With Body Control Module "B"Learn More
Lost Communication With Body Control ModuleLearn More
Secondary Air Injection System Relay A circuit MalfunctionLearn More
Knock Control CPU.Learn More
Igniter Circuit Malfunction - No. 1.Learn More
- Manufacturer: Toyota
About the Prius
Built by the Japanese car manufacturer Toyota, the Prius has always been a hybrid vehicle with an internal combustion engine and electric motor.
The first generations sold from 1997 onwards and had the industry code name NHW10.
Initially unveiled at the Tokyo motor show, the Prius went on sale in December of the same year and was only available outside of Japan via private importing.
Holding the prestigious title of the very first mass-produced gasoline-electric hybrid car, the vehicle then went on to win Car of the Year.
Three years later, in 2000, Toyota made the decision to offer the car globally following great sales figures; and the second generation debuted at the New York International Auto Show. Completely changed stylistically, the Prius looked less like a traditional car, and moved towards the iconic styling that we see today.
As of 2017, the Prius had sold in over 90 countries with sales reaching 1 million units.
As an iconic hybrid, the car is featured in a number of TV shows, perhaps most notably as Brian’s vehicle in the American cartoon Family Guy.
Several common fault codes are:
- B1421 – The most common Toyota Prius fault code that people come here to diagnose is the B1421. This code is telling you that the solar sensor (a component that detects the sunlight coming through the windscreen) is operating outside of the expected voltage and suggests a faulty sensor.
- P0101 – This code is common among most modern automobiles and suggests that the mass airflow meter is faulty.
- P1150 – For Toyota models, the P1150 fault code represents that there is a problem with the fuel/air sensor located in the front-right of the car.
- P0420 – Showing a low catalyst system efficiency. This means that the oxygen levels are under the required level.
- P0171 – Either too much oxygen or too little fuel in the exhaust system. It could mean that a vacuum leak is present.
- P0401 – A diagnostic code altering the driver’s attention to the detection of exhaust gas recirculation.
- P0117 – This could show for a number of reasons, perhaps an engine coolant temperature sensor circuit low output issue.
- P0446 – A vent control circuit malfunction, meaning that the onboard computer has found a problem with the EVAP system.