Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Toyota Prius XLE AWD-eFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (5 Of 8)
- SFI System
- DTC P0443-13: Evaporative Emission System Purge Control Valve "A" Circuit Open [07/2020 - ]
- DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [11/2015 - 12/2018]
- DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [12/2018 - 07/2020]
- DTC P0450-11: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground; DTC P0450-15: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Battery or Open; DTC P0450-2F: Evaporative Emission System Pressure Sensor/Switch Signal Erratic [07/2020 - ]
- DTC P0505-00: Idle Control System [11/2015 - 12/2018]
- DTC P0505-00: Idle Control System [12/2018 - ]
- DTC P050A-00: Cold Start Idle Control System Performance [11/2015 - 11/2017]
- DTC P050A-00: Cold Start Idle Control System Performance [11/2017 - ]
- DTC P050B-00: Cold Start Ignition Timing Performance [11/2015 - 11/2017]
- DTC P050B-00: Cold Start Ignition Timing Performance [11/2017 - ]
- DTC P0560-14: System Voltage Circuit Short to Ground or Open [11/2015 - ]
- DTC P059F-73: Active Grille Air Shutter "A" Actuator Stuck Closed; DTC P05A0-72: Active Grille Air Shutter "A" Actuator Stuck Open [11/2015 - 12/2018]
- DTC P059F-73: Active Grille Air Shutter "A" Actuator Stuck Closed; DTC P05A0-72: Active Grille Air Shutter "A" Actuator Stuck Open [12/2018 - ]
- DTC P05A0-74: Active Grille Air Shutter "A" Actuator Slipping [11/2015 - 12/2018]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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