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 Lexus NX 300 Base, AWDFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (2 Of 9)
- SFI System
- DTC P050A-00: Cold Start Idle Control System Performance [10/2014 - 09/2017]
- DTC P050A-00: Cold Start Idle Control System Performance [09/2017 - 05/2018]
- DTC P050A-00: Cold Start Idle Control System Performance [05/2018 - ]
- DTC P050B-00: Cold Start Ignition Timing Performance [10/2014 - 09/2017]
- DTC P050B-00: Cold Start Ignition Timing Performance [09/2017 - ]
- DTC P0520-12: Engine Oil Pressure Sensor/Switch "A" Circuit Short to Battery; DTC P0520-14: Engine Oil Pressure Sensor/Switch "A" Circuit Short to Ground or Open; DTC P0520-24: Engine Oil Pressure Sensor/Switch "A" Signal Stuck High; DTC P0520-2A: Engine Oil Pressure Sensor/Switch "A" Signal Stuck in Range; DTC P0524-00: Engine Oil Pressure Too Low [10/2014 - 07/2020]
- DTC P0520-12: Engine Oil Pressure Sensor/Switch "A" Circuit Short to Battery; DTC P0520-14: Engine Oil Pressure Sensor/Switch "A" Circuit Short to Ground or Open; DTC P0520-24: Engine Oil Pressure Sensor/Switch "A" Signal Stuck High; DTC P0520-2A: Engine Oil Pressure Sensor/Switch "A" Signal Stuck in Range; DTC P0524-00: Engine Oil Pressure Too Low [07/2020 - ]
- DTC P0560-14: System Voltage Circuit Short to Ground or Open [10/2014 - ]
- DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [10/2014 - 05/2019]
- DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [05/2019 - ]
- DTC P0606-04: Control Module Processor System Internal Failure; DTC P0606-29: Control Module Processor Signal Invalid; DTC P0606-47: Control Module Processor Watchdog/Safety MCU Failure [10/2014 - 05/2019]
- DTC P0606-04: Control Module Processor System Internal Failure; DTC P0606-29: Control Module Processor Signal Invalid; DTC P0606-47: Control Module Processor Watchdog/Safety MCU Failure [05/2019 - ]
- DTC P0607-96: Control Module Performance Bank 1 Component Internal Failure [10/2014 - ]
- DTC P060A-47: Internal Control Module Monitoring Processor Performance Watchdog/Safety MCU Failure [10/2014 - 05/2019]
- DTC P060A-47: Internal Control Module Monitoring Processor Performance Watchdog/Safety MCU Failure [05/2019 - ]
- DTC P060B-49: Internal Control Module A/D Processing Performance Internal Electronic Failure [10/2014 - 05/2019]
- DTC P060B-49: Internal Control Module A/D Processing Performance Internal Electronic Failure [05/2019 - ]
- DTC P060D-49: Internal Control Module Accelerator Pedal Position Performance Internal Electronic Failure [10/2014 - 05/2019]
- DTC P060D-49: Internal Control Module Accelerator Pedal Position Performance Internal Electronic Failure [05/2019 - ]
- DTC P060E-49: Internal Control Module Throttle Position Performance Internal Electronic Failure; DTC P061E-49: Internal Control Module Brake Signal Internal Electronic Failure [10/2014 - 05/2019]
- DTC P060E-49: Internal Control Module Throttle Position Performance Internal Electronic Failure; DTC P061E-49: Internal Control Module Brake Signal Internal Electronic Failure [05/2019 - ]
- DTC P0615-12: Starter Relay Circuit Short to Battery [10/2014 - ]
- DTC P062F-44: Internal Control Module EEPROM Data Memory Failure [10/2014 - 09/2017]
- DTC P062F-44: Internal Control Module EEPROM Data Memory Failure [09/2017 - 05/2019]
- DTC P062F-44: Internal Control Module EEPROM Data Memory Failure [05/2019 - ]
- DTC P0630-51: VIN Not Programmed [10/2014 - ]
- DTC P0657-14: Actuator Supply Voltage "A" Circuit Short to Ground or Open [10/2014 - 05/2019]
- DTC P0657-14: Actuator Supply Voltage "A" Circuit Short to Ground or Open [05/2019 - ]
- DTC P0657-9E: Actuator Supply Voltage "A" Stuck On [10/2014 - 09/2017]
- DTC P0657-9E: Actuator Supply Voltage "A" Stuck On [09/2017 - 05/2019]
- DTC P0657-9E: Actuator Supply Voltage "A" Stuck On [05/2019 - ]
- DTC P0703-12: Brake Switch "B" Circuit Short to Battery [05/2018 - ]
- DTC P0705-13: Transmission Range Sensor "A" Circuit Open; DTC P0705-62: Transmission Range Sensor "A" Signal Compare Failure [10/2014 - 05/2019]
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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