Why is there a burning smell coming from my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

3 min read

594 words

Problem Statement

Learn how to diagnose and address the burning smell issue in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component

engine, brakes, electrical system, coolant system, transmission

Symptoms

•A distinct burning odor while driving or after parking.
•Possible smoke or steam coming from under the hood or around the wheels.
•Increased engine temperature on the gauge.
•Warning lights on the dashboard, such as the check engine light or brake warning light.

Diagnostic Steps

1
Check for visible oil leaks under the vehicle or around the engine compartment.
2
Inspect brake components for wear and overheating signs (e.g., discoloration).
3
Look for any signs of burnt wiring or electrical components.
4
Verify engine oil level and condition using the dipstick.
5
Check coolant level and inspect for any leaks.
6
With the engine running, carefully identify the source of the burning smell (engine bay, wheels, etc.).
7
Use an infrared thermometer to check the temperature of the brakes and engine components after driving.
8
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may provide clues about the issue.

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
•Infrared thermometer
•Basic hand tools (wrenches, sockets)
•Brake cleaner
•Shop towels
•Safety goggles and gloves

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Diagnostic Steps

1
Check for visible oil leaks under the vehicle or around the engine compartment.
2
Inspect brake components for wear and overheating signs (e.g., discoloration).
3
Look for any signs of burnt wiring or electrical components.
4
Verify engine oil level and condition using the dipstick.
5
Check coolant level and inspect for any leaks.
6
With the engine running, carefully identify the source of the burning smell (engine bay, wheels, etc.).
7
Use an infrared thermometer to check the temperature of the brakes and engine components after driving.
8
Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may provide clues about the issue.

Solution

Issue: Burning Smell from 2020 Toyota Highlander

Possible Causes

Oil Leak: Oil dripping onto hot engine components.
Brake Issues: Overheated brakes from dragging calipers or worn brake pads.
Electrical Problems: Short circuits or damaged wiring.
Coolant Leak: Coolant leaking onto hot engine parts.
Clutch or Transmission Issues: Overheated transmission fluid or slipping clutch.

Tools Required

OBD-II scanner
Infrared thermometer
Basic hand tools (wrenches, sockets)
Brake cleaner
Shop towels
Safety goggles and gloves

Repair Instructions

1. Addressing Oil Leaks

Step 1: Locate the source of the oil leak (e.g., valve cover gasket, oil pan).
Step 2: Clean the area with brake cleaner and a shop towel.
Step 3: Replace any damaged gaskets or seals. If the oil pan is leaking, drain the oil, remove the pan, replace the gasket, and reinstall.

2. Inspecting Brakes

Step 1: Remove the wheel to access the brake components.
Step 2: Inspect brake pads for wear; replace if worn beyond specification (generally 3mm or less).
Step 3: Check caliper function; if it is sticking, clean or replace as necessary.
Step 4: Reassemble the wheel and check for any further burning smell during a test drive.

3. Electrical Inspection

Step 1: Disconnect the battery.
Step 2: Inspect wiring harnesses and connectors for signs of melting or damage.
Step 3: Repair or replace any damaged wiring.
Step 4: Reconnect the battery and test for any electrical issues.

4. Coolant Leak Repair

Step 1: Identify the source of the coolant leak (e.g., radiator, hoses, water pump).
Step 2: If hoses are leaking, replace them; if the radiator is the problem, drain the coolant and replace it.
Step 3: After repair, refill the coolant and check for leaks again.

5. Transmission or Clutch Issues

Step 1: If symptoms suggest a slipping clutch or transmission overheating, check fluid levels and condition.
Step 2: If fluid is burnt or low, replace the fluid and filter (if applicable).
Step 3: If the problem persists, further diagnosis may be needed, including possible clutch replacement or transmission service.

Conclusion

If you are unable to pinpoint the issue or if the problem persists after performing these steps, it is advised to seek professional assistance from a certified automotive technician. Ignoring a burning smell can lead to more severe damage and potentially unsafe driving conditions.