my Tesla Model 3 Highland (2024-present) has a burning smell when accelerating what's wrong

Tesla Model 3 Highland (2024-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

530 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix burning smell during acceleration in Tesla Model 3 Highland. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before inspecting the motor or battery to prevent burns.

Symptoms

•Burning smell, particularly when accelerating
•Possible loss of power or reduced performance
•Unusual noises from the powertrain
•Overheating of the battery or motor
•Warning lights illuminated on the dashboard

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any error codes.
2
Inspect the battery pack and wiring for signs of damage, corrosion, or overheating.
3
Check the motor and inverter for any visible signs of wear or burning.
4
Examine the brake system for any sticking components that could cause excessive heat.
5
Monitor battery temperature through the vehicle's display to identify overheating conditions.

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
•Socket set
•Infrared thermometer
•Jack and jack stands

Parts Required

•Replacement motor or inverter components (if damaged)
•Brake pads (if worn)

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Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any error codes.
2
Inspect the battery pack and wiring for signs of damage, corrosion, or overheating.
3
Check the motor and inverter for any visible signs of wear or burning.
4
Examine the brake system for any sticking components that could cause excessive heat.
5
Monitor battery temperature through the vehicle's display to identify overheating conditions.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, infrared thermometer.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the 12V battery to prevent any electrical shorts while inspecting components.

2. Inspect Battery and Wiring

Sub-steps:
1. Remove the undercarriage shield (if applicable) using a socket set.
2. Visually inspect the high-voltage battery connections for any frayed wires or corrosion.
3. Use an infrared thermometer to check for abnormal temperature readings on the battery pack.
4. Tighten any loose connections to ensure proper contact.

3. Examine Motor and Inverter

Sub-steps:
1. Remove any covers protecting the motor and inverter.
2. Inspect the motor windings and inverter for signs of overheating or burnt insulation.
3. Check the inverter's cooling fans to ensure they are operational.
4. Replace any damaged components as needed.

4. Investigate Brake System

Sub-steps:
1. Lift the vehicle using a jack and secure it with jack stands.
2. Inspect brake calipers and pads for excessive wear or sticking.
3. Clean any debris from the calipers and lubricate sliding pins if necessary.
4. Replace brake pads if they are worn beyond specifications.

5. Reassemble and Reconnect

Reinstall any covers and the undercarriage shield removed during inspection.
Reconnect the 12V battery and ensure all connections are secure.