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

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

634 words

Problem Statement

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

Affected Component

engine, transmission, brakes, electrical system, exhaust system

Symptoms

•Burning smell while driving
•Smoke from under the hood
•Unusual engine noises
•Performance issues
•Warning lights on the dashboard

Diagnostic Steps

1
Visual Inspection
2
Check Fluid Levels
3
Brake System Check

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
•Gloves
•Dipstick
•Funnel
•Clean rag
•Jack
•Jack stands
•Lug wrench
•Torque wrench
•Oil catch pan
•Socket set
•Wrench set
•New gaskets or seals
•Transmission fluid
•New brake pads and rotors
•Brake cleaner
•Multimeter
•Electrical tape
•Wire connectors
•Exhaust pipe clamps
•Muffler tape
•Welding equipment

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Solution

Diagnosing a Burning Smell in a 2020 Toyota Highlander

Possible Causes

Oil Leak: Oil may be leaking onto hot engine components.
Transmission Fluid Leak: Transmission fluid could be leaking and burning on hot components.
Worn Brake Components: Overheated brakes can emit a burning smell, especially if the brake pads are worn.
Electrical Shorts: Wiring issues or shorts can produce a burning odor.
Exhaust System Issues: Problems in the exhaust system can lead to a burning smell.

Step 1: Visual Inspection

Tools Required: Flashlight, gloves
Instructions:
1. Park the vehicle on a flat surface and turn off the engine.
2. Open the hood and inspect for any visible oil or transmission fluid leaks.
3. Check the condition of the brake pads and rotors for excessive wear.
4. Inspect wiring harnesses for any signs of melting or damage.
5. Look for any signs of exhaust leaks or damage.

Step 2: Check Fluid Levels

Tools Required: Dipstick (for oil and transmission fluid), funnel, clean rag
Instructions:
1. Check the engine oil level using the dipstick. Look for a dark or burnt smell which indicates overheating.
2. Check the transmission fluid level and condition (should be a bright red color and not have a burnt smell).
3. Inspect coolant levels and condition in the reservoir and radiator.

Step 3: Brake System Check

Tools Required: Jack, jack stands, lug wrench, torque wrench
Instructions:
1. Safely lift the vehicle using a jack and secure it with jack stands.
2. Remove the wheels to access the brake components.
3. Inspect the brake pads for thickness. If they are less than 3mm, they should be replaced.
4. Look for signs of glazing (shiny surface) on the pads or rotors, which can indicate overheating.
5. Check for any dragging brakes, which can contribute to the burning smell.

Repair Instructions

Repair for Oil Leak

Tools Required: Oil catch pan, socket set, wrench set, new gaskets or seals
Instructions:
- If an oil leak is found, clean the area and identify the source (e.g., valve cover gasket, oil filter).
- Replace any damaged gaskets or seals as necessary.
- Refill engine oil if levels are low.

Repair for Transmission Fluid Leak

Tools Required: Transmission fluid, funnel, socket set, new gaskets or seals
Instructions:
- Locate the source of the transmission fluid leak (e.g., pan gasket).
- Replace the damaged component and refill the transmission fluid.

Repair for Brake Issues

Tools Required: New brake pads and rotors (if needed), brake cleaner, torque wrench
Instructions:
- Remove the old brake pads and rotors, cleaning the caliper bracket.
- Install new pads and rotors, ensuring all bolts are torqued to manufacturer specifications.
- Reassemble and lower the vehicle.

Repair for Electrical Issues

Tools Required: Multimeter, electrical tape, wire connectors
Instructions:
- Identify the damaged wiring.
- Repair or replace as necessary, ensuring all connections are secure and insulated.

Repair for Exhaust System Issues

Tools Required: Exhaust pipe clamps, muffler tape, or welding equipment (if necessary)
Instructions:
- Inspect the exhaust system for holes, loose connections, or damage.
- Repair or replace any damaged components to eliminate leaks.

Conclusion

After performing these diagnostic steps and repairs, take the vehicle for a test drive to ensure the burning smell is resolved. If the smell persists, further diagnosis may be required, potentially involving a visit to a professional technician. Always ensure safety during inspections and repairs, and consult the owner’s manual for any specific torque specifications or procedures.