why does my Toyota Highlander Fourth Generation (2020-present) transmission fluid smell burnt

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

475 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

Discover why your Toyota Highlander transmission fluid smells burnt and learn how to diagnose and fix the issue with our step-by-step guide.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening any components.

Symptoms

•Burnt smell from the transmission fluid
•Difficulty shifting gears
•Slipping transmission
•Overheating of the transmission
•Warning light on the dashboard

Diagnostic Steps

1
Check the transmission fluid level using the dipstick.
2
Inspect the transmission fluid color; it should be bright red or pink, not dark brown or black.
3
Use an OBD-II scanner to check for any transmission-related trouble codes.
4
Inspect the transmission cooler lines for leaks or damage.
5
Check for any visible signs of transmission fluid leakage underneath the vehicle.

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

•Socket set
•Wrench set
•OBD-II scanner
•Drain pan
•Funnel
•Rags

Parts Required

•Transmission fluid (Toyota Genuine ATF WS)
•Transmission filter (if applicable)
•Gasket for transmission pan

Related Faults

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Diagnostic Steps

1
Check the transmission fluid level using the dipstick.
2
Inspect the transmission fluid color; it should be bright red or pink, not dark brown or black.
3
Use an OBD-II scanner to check for any transmission-related trouble codes.
4
Inspect the transmission cooler lines for leaks or damage.
5
Check for any visible signs of transmission fluid leakage underneath the vehicle.

Solution

1. Preparation

Gather tools: Socket set, wrench set, funnel, OBD-II scanner, rags.
Ensure the vehicle is on a level surface and the engine is off.
Allow the engine to cool before starting work.

2. Drain Old Transmission Fluid

Sub-steps:
1. Place a drain pan under the transmission pan.
2. Remove the transmission pan bolts using a socket wrench.
3. Carefully lower the pan to drain the old fluid completely.

3. Inspect and Clean

Sub-steps:
1. Inspect the transmission pan for metal shavings or debris, indicating internal damage.
2. Clean the pan with a suitable solvent and a clean rag.
3. Replace the transmission filter if applicable (access may require removing additional components).

4. Refill with New Transmission Fluid

Sub-steps:
1. Replace the transmission pan with a new gasket.
2. Torque the pan bolts to the manufacturer’s specifications (usually around 8-10 ft-lbs).
3. Using a funnel, refill the transmission with new fluid (Toyota Genuine ATF WS is recommended), following the vehicle's capacity specifications.

5. Final Checks

Sub-steps:
1. Start the engine and allow it to reach operating temperature.
2. Shift through all gears while monitoring the fluid level on the dipstick.
3. Add fluid as necessary to maintain the correct level.