What could be causing my 2020 Highlander to have a burning smell?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

663 words

Problem Statement

Learn how to diagnose and resolve burning smell issues in your 2020 Toyota Highlander with detailed steps and required tools.

Affected Component

multiple components (electrical, fluids, brakes, engine)

Symptoms

•Burning smell (plastic, rubber, or oil)
•Smoke
•Warning lights on the dashboard (e.g., oil pressure or temperature warning)
•Unusual noises
•Reduced performance or stalling

Diagnostic Steps

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
•Infrared thermometer
•Basic hand tools (screwdrivers, wrenches)
•Flashlight
•Safety gloves and goggles
•Rags for cleaning

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Solution

Burning Smell in 2020 Toyota Highlander

A burning smell in your 2020 Toyota Highlander can be caused by several issues, including electrical problems, overheated fluids, or mechanical failures. Below are detailed diagnostic steps and repair instructions to identify and resolve the issue.

Tools Required

OBD-II scanner
Multimeter
Infrared thermometer
Basic hand tools (screwdrivers, wrenches)
Flashlight
Safety gloves and goggles
Rags for cleaning

Step 1: Initial Visual Inspection

Safety First: Ensure the vehicle is parked on a level surface, the engine is off, and the keys are removed from the ignition.
Inspect for Visible Damage:
- Check under the hood for any signs of burnt wires, melted plastic components, or leaking fluids.
- Inspect the engine bay for any foreign objects that may have dropped and are making contact with hot surfaces.
- Look at the tires for signs of excessive wear that might produce rubber burning smells.

Step 2: Check Fluid Levels and Conditions

Engine Oil:
- Check the engine oil level using the dipstick.
- Inspect the oil for signs of burning (dark color, burnt smell).
Transmission Fluid:
- Check the transmission fluid level and condition (should be a clear red color and not burnt).
Coolant:
- Inspect the coolant level in the reservoir and check for leaks.
- Look for signs of overheating in the hoses or radiator.

Step 3: Scan for Diagnostic Trouble Codes (DTCs)

Use OBD-II Scanner:
- Connect the scanner to the OBD-II port under the dashboard.
- Read any stored trouble codes that may point to electrical issues or sensor failures.

Step 4: Electrical Inspection

Check Battery and Alternator:
- Use a multimeter to check battery voltage (should be around 12.6V when off, and 13.7-14.7V when running).
- Inspect battery terminals for corrosion.
Inspect Wiring:
- Look for frayed or damaged wires, particularly around the starter, alternator, and fuse box.
- Check for any melted insulation on wiring.

Step 5: Brake Inspection

Check Brake Components:
- Inspect brake pads, rotors, and calipers for excessive wear.
- Listen for brake dragging or grinding noises that may indicate seized components.
- Look for signs of overheating (discoloration or a burning smell emanating from the wheels).

Step 6: Inspect Engine Components

Check for Overheating:
- Use an infrared thermometer to measure temperatures in the engine bay.
- Look for any components running hotter than normal (e.g., engine, exhaust manifold).
Inspect Belts and Hoses:
- Check for worn or cracked belts that may be rubbing against other components.
- Inspect hoses for leaks or signs of wear.

Repair Instructions

Based on Diagnostic Findings

If Fluid is Burnt:
- Change the affected fluid (engine oil, transmission fluid, etc.) and replace the filter if applicable.
- Ensure no leaks are present.
If Electrical Issues are Found:
- Repair or replace any damaged wiring or connectors.
- Replace the battery if it fails the voltage test.
If Brake Components are Worn:
- Replace worn brake pads, rotors, or calipers as needed.
- Ensure that calipers are not seized and are functioning properly.
If Overheating is Detected:
- Check the cooling system for leaks and replace any damaged hoses or components.
- Ensure the radiator is functioning and not clogged.
If Belts or Hoses are Damaged:
- Replace any worn or cracked belts or hoses immediately.

Conclusion

Once repairs are completed, take the vehicle for a test drive to ensure the burning smell has dissipated and monitor for any recurrence of symptoms. If the problem persists or if you have any concerns, it is advisable to consult a professional mechanic for further assistance.