Diagnostic Trouble Code Chart [11/2023 - ]

2025 Toyota Highlander XLE, FWDSECTION Diagnostic Trouble Code Chart [11/2023 - ]
FRONT RADAR SENSOR SYSTEM

DTC No. Detection Item Link
C1A11-00 Front Radar Sensor Optical Axis Misalignment Malfunction Refer to DTC C1A11-00: Front Radar Sensor Optical Axis Misalignment Malfunction [09/2020 - ]
C1A8C-46 Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure Refer to DTC C1A8C-46: Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure; DTC C1A8D-1C: Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range; DTC C1A90-00: Malfunction of Millimeter-wave Circuit in Front Radar Sensor; DTC C1A91-00: Malfunction of Acceleration Sensor in Front Radar Sensor [09/2020 - ]
C1A8D-1C Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range Refer to DTC C1A8C-46: Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure; DTC C1A8D-1C: Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range; DTC C1A90-00: Malfunction of Millimeter-wave Circuit in Front Radar Sensor; DTC C1A91-00: Malfunction of Acceleration Sensor in Front Radar Sensor [09/2020 - ]
C1A90-00 Malfunction of Millimeter-wave Circuit in Front Radar Sensor Refer to DTC C1A8C-46: Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure; DTC C1A8D-1C: Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range; DTC C1A90-00: Malfunction of Millimeter-wave Circuit in Front Radar Sensor; DTC C1A91-00: Malfunction of Acceleration Sensor in Front Radar Sensor [09/2020 - ]
C1A91-00 Malfunction of Acceleration Sensor in Front Radar Sensor Refer to DTC C1A8C-46: Main Microcomputer in Front Radar Sensor Calibration/Parameter Memory Failure; DTC C1A8D-1C: Power Supply Circuit in Front Radar Sensor Circuit Voltage Out of Range; DTC C1A90-00: Malfunction of Millimeter-wave Circuit in Front Radar Sensor; DTC C1A91-00: Malfunction of Acceleration Sensor in Front Radar Sensor [09/2020 - ]
U0104-87 Lost Communication with Cruise Control Module Missing Message Refer to DTC U0104-87: Lost Communication with Cruise Control Module Missing Message [11/2023 - ]
U0305-57 Software Incompatibility with Cruise Control Module Invalid/Incompatible Software Component Refer to DTC U0305-57: Software Incompatibility with Cruise Control Module Invalid/Incompatible Software Component [11/2023 - ]
RENDER: 1.0x

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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.