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What could cause the traction control light to stay on in a 2020 Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What could cause the traction control light to stay on in a 2020 Highlander?

What could cause the traction control light to stay on in a 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
726 words

Problem Statement

Learn how to diagnose and repair the traction control light staying on in a 2020 Toyota Highlander with detailed steps and required tools.

Affected Component
Traction Control System
Estimated Time
2-4 hours

Symptoms

  • •Traction control light continuously lit
  • •Reduced grip on slippery surfaces
  • •Unstable handling during acceleration
  • •ABS light may also be on

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •Flashlight
  • •Multimeter
  • •OBD-II Scanner
  • •Socket set
  • •Torque wrench
  • •Wire stripper/crimper
  • •Electrical tape

Additional Information

Affected Component
Traction Control System
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
7 items

Related Faults

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Possible Causes
  1. Faulty Wheel Speed Sensors: These sensors provide data to the traction control system about the speed of each wheel.
  2. Malfunctioning ABS Module: An issue with the ABS module can affect the traction control system.
  3. Wiring Issues: Damaged or corroded wiring can disrupt signals to the traction control system.
  4. Faulty Brake Light Switch: This switch can affect the operation of the traction control system.
  5. Tire Issues: Mismatched tire sizes or low tire pressure can trigger the traction control light.
  6. Steering Angle Sensor Malfunction: This sensor helps the traction control system determine vehicle direction.
Step 1: Visual Inspection
  • Tools Required: Flashlight, Multimeter
  • Check for any visible damage to wheel speed sensors, wiring harnesses, and connectors.
  • Inspect tire condition and pressure, ensuring all tires are at the recommended PSI and are of matching size.
Step 2: Scan for Trouble Codes
  • Tools Required: OBD-II Scanner
  • Connect the OBD-II scanner to the vehicle’s diagnostic port.
  • Retrieve any stored trouble codes related to the ABS or traction control system. Common codes include C0210 (left front wheel speed sensor) or C1201 (ABS control system fault).
Step 3: Check Wheel Speed Sensors
  • Tools Required: Multimeter
  1. Disconnect the connector from the wheel speed sensor.
  2. Measure the resistance of the sensor using a multimeter. A typical reading should be between 1,000 to 2,000 ohms.
  3. Inspect the wiring harness for any shorts or breaks.
Step 4: Inspect the ABS Module
  • Tools Required: OBD-II Scanner, Visual Inspection
  • If codes indicate an ABS issue, further diagnostics on the ABS module may be necessary.
  • Check for any physical damage or corrosion on the module.
Step 5: Check Brake Light Switch
  • Tools Required: Multimeter
  1. Locate the brake light switch (usually near the brake pedal).
  2. Use a multimeter to test continuity when the brake pedal is pressed. Ensure it functions correctly.
Step 6: Verify Steering Angle Sensor
  • Tools Required: OBD-II Scanner, Visual Inspection
  • If related codes are present, check the steering angle sensor data via the scanner. Calibration may be required after repairs.
Repair Instructions
Repair 1: Replace Wheel Speed Sensor
  1. Tools Required: Socket set, Torque wrench
  2. Raise and securely support the vehicle.
  3. Remove the wheel to access the wheel speed sensor.
  4. Disconnect the sensor connector and unbolt the sensor.
  5. Install the new sensor and torque it to manufacturer specifications.
  6. Reconnect the sensor and wheel, then lower the vehicle.
Repair 2: Repair or Replace Wiring
  1. Tools Required: Wire stripper/crimper, Electrical tape
  2. Locate the damaged wiring based on visual inspection.
  3. Cut out damaged sections and splice in new wiring using appropriate connectors.
  4. Insulate connections with electrical tape to prevent moisture ingress.
Repair 3: Replace Brake Light Switch
  1. Tools Required: Socket set
  2. Disconnect the battery to avoid any electrical issues.
  3. Remove the old brake light switch from its bracket.
  4. Install the new switch and adjust it until the brake lights illuminate when pressed.
  5. Reconnect the battery.
Repair 4: Calibrate Steering Angle Sensor
  1. Tools Required: OBD-II Scanner
  2. After any repairs, use the OBD-II scanner to clear any fault codes.
  3. Follow the scanner prompts to calibrate the steering angle sensor, if applicable.
Final Steps
  1. Test Drive: After completing repairs, take the vehicle for a test drive to ensure the traction control light is off and the system functions correctly.
  2. Recheck Codes: After the test drive, scan the vehicle again to ensure no new codes have been logged.

By following these detailed steps, you can accurately diagnose and fix the issue causing the traction control light to stay on in a 2020 Toyota Highlander.