How do I fix the malfunctioning traction control in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

558 words

Problem Statement

Learn how to diagnose and fix traction control issues in your 2020 Toyota Highlander with step-by-step instructions.

Affected Component

Traction Control System

Estimated Time

2-3 hours

Symptoms

•Dashboard Warning Light
•Unresponsive Traction Control System
•Frequent Activation
•Reduced Engine Power

Diagnostic Steps

1
Check for Diagnostic Trouble Codes (DTCs)
2
Inspect Wheel Speed Sensors
3
Inspect ABS Module and Wiring

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

•OBD-II Scanner
•Multimeter
•Basic Hand Tools (socket set, wrenches)
•Wiring Diagram (from service manual)

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Solution

Fixing the Malfunctioning Traction Control in a 2020 Toyota Highlander

Step 1: Check for Diagnostic Trouble Codes (DTCs)

Tools Required:

OBD-II Scanner

Connect the OBD-II Scanner: Locate the OBD-II port under the dashboard on the driver's side.
Turn the Ignition On: Without starting the engine.
Read DTCs: Follow the scanner’s instructions to retrieve any codes.
Note the Codes: Make a note of any codes related to the traction control system (e.g., C1201, C1210).

Step 2: Inspect Wheel Speed Sensors

Tools Required:

Multimeter
Basic Hand Tools (socket set, wrenches)

Locate Wheel Speed Sensors: These are typically located at each wheel hub.
Visual Inspection: Check for any physical damage or disconnections in the wiring.
Test Sensor Resistance:
- Disconnect the sensor connector.
- Use a multimeter to check resistance; it should typically be between 800-1200 ohms (refer to the service manual for specific values).
- Replace any defective sensors.

Step 3: Inspect ABS Module and Wiring

Tools Required:

Multimeter
Wiring Diagram (from service manual)
Basic Hand Tools

Locate the ABS Module: This is usually found near the brake master cylinder.
Visual Inspection: Look for damaged wires or corrosion on connectors.
Check Voltage: With the engine on, check the voltage at the ABS module using a multimeter. Ensure it meets manufacturer specifications.
Check Ground Connection: Ensure the ground connection is intact and free of rust or corrosion.

Repair Instructions

Step 1: Replace Faulty Wheel Speed Sensors

Raise the Vehicle: Use jack stands to support the vehicle securely.
Remove Wheel: Take off the wheel to access the sensor.
Disconnect Sensor: Unplug the connector from the wheel speed sensor.
Remove Sensor: Unscrew the sensor from its housing.
Install New Sensor: Place the new sensor into the housing, securing it with screws.
Reconnect the Harness: Plug the connector back into the new sensor.
Reinstall Wheel: Replace the wheel and lower the vehicle.

Step 2: Repair or Replace Wiring

Identify Damaged Sections: Use the wiring diagram to trace the circuit.
Repair Wiring: Use solder and heat shrink tubing to repair any damaged wires.
Test Connections: Ensure all connections are tight and secure.

Step 3: Reset the ABS/Traction Control System

Clear DTCs: Use the OBD-II scanner to clear any diagnostic trouble codes.
Test Drive: Take the vehicle for a short drive to ensure the traction control system functions correctly.

Final Checks

Perform a System Test: While driving, test the traction control in a safe area to ensure it engages when necessary.
Recheck Dashboard Lights: Verify that the traction control light does not illuminate during normal operation.

Conclusion

If the traction control system is still malfunctioning after these steps, it may require further diagnosis with specialized equipment or attention from a certified technician, as issues could lie within the ABS module or the vehicle’s ECU.