Why does my 2020 Toyota Highlander have a burning smell while driving?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

3 min read

584 words

Problem Statement

Learn how to diagnose and fix a burning smell in your 2020 Toyota Highlander, including symptoms, potential causes, and step-by-step diagnostic instructions.

Affected Component

engine, brakes, transmission, electrical system

Symptoms

•Noticeable burning smell while driving
•Smoke visible from engine bay or under the vehicle
•Overheating warning light on the dashboard
•Unusual noises from the engine or brakes

Diagnostic Steps

1
Park the vehicle safely and turn off the engine
2
Open the hood and inspect for visible oil, transmission fluid, or coolant leaks
3
Check brake components for excessive wear
4
Inspect wiring for frayed or melted wires
5
Check engine oil, transmission fluid, and coolant levels

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

•Basic hand tools (screwdrivers, wrenches)
•Brake pad thickness gauge
•Oil dipstick
•Transmission dipstick (if applicable)
•Flashlight for inspection
•Coolant tester (optional)

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Solution

Problem Diagnosis: Burning Smell in 2020 Toyota Highlander

Potential Causes

Oil Leaks - Engine oil leaking onto hot engine components.
Transmission Fluid Leak - Transmission fluid leaking onto the exhaust.
Brake Issues - Overheating brakes due to stuck calipers or worn brake pads.
Electrical Issues - Overheating wiring or components.
Clutch Problems (if applicable) - For models with a manual transmission.
Overheating Engine - Coolant leaks or issues with the cooling system.

Step 1: Visual Inspection

Park the Vehicle Safely: Ensure the vehicle is on a flat surface and turn off the engine.
Open the Hood: Inspect for any visible oil, transmission fluid, or coolant leaks.
Check Brake Components: Inspect brake pads and rotors for excessive wear.
Inspect Wiring: Look for any frayed or melted wires that could indicate electrical issues.

Step 2: Check Fluid Levels

Engine Oil Level: Use the dipstick to check oil level and condition. Look for signs of burning or a burnt odor.
Transmission Fluid Level: Check fluid level using the dipstick (if applicable) and inspect for burning smell.
Coolant Level: Check the coolant reservoir for low levels or signs of leaks.

Step 3: Brake System Check

Brake Pad Thickness: Inspect the brake pads for wear; thickness should be above 3 mm.
Caliper Functionality: Check if calipers are releasing properly by spinning the wheel; it should spin freely.
Brake Fluid Level: Ensure brake fluid is at the appropriate level.

Tools Required

Basic hand tools (screwdrivers, wrenches)
Brake pad thickness gauge
Oil dipstick
Transmission dipstick (if applicable)
Flashlight for inspection
Coolant tester (optional)

Repair Instructions

Case 1: Oil Leak

Identify Leak Source: Clean the engine area and drive the vehicle briefly. Re-inspect for fresh oil.
Replace Gaskets or Seals: If a gasket or seal is leaking, replace it.
Clean Residue: Clean any oil residue from hot engine parts to eliminate burning smell.

Case 2: Transmission Fluid Leak

Inspect Transmission Pan: Look for leaks around the pan gasket or seal.
Replace Gasket/Seal: If damaged, replace the transmission pan gasket.
Top Off Fluid: Ensure transmission fluid is at the proper level.

Case 3: Brake Issues

Replace Brake Pads: If brake pads are worn down, replace them.
Service Calipers: If calipers are sticking, clean or replace as necessary.
Bleed Brake System: After any brake service, bleed the brakes to ensure proper operation.

Case 4: Electrical Issues

Inspect Wiring: Locate and replace any damaged wiring or connectors.
Check Fuses: Ensure all fuses are intact and replace as needed.

Case 5: Overheating Engine

Inspect Cooling System: Check for leaks in hoses, radiator, and water pump.
Replace Thermostat: If the thermostat is stuck, replace it.
Flush Cooling System: If necessary, flush and refill the cooling system.

Conclusion

If the burning smell persists after performing the above checks and repairs, or if you are uncomfortable performing these diagnostics and repairs yourself, it is highly recommended to take your vehicle to a qualified automotive technician or dealership service department for further inspection. This ensures safety and proper handling of the vehicle's issues.