why does my Toyota Highlander Third Generation (2014-2019) make a noise when I shift into gear

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

532 words

Problem Statement

Learn how to diagnose and fix transmission noise when shifting in a 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before working on the transmission to avoid burns.

Symptoms

•Noise (clunking or grinding) when shifting into gear
•Delayed engagement when shifting
•Vibration felt in the gear shifter
•Fluid leaks under the vehicle
•Check engine light illuminated (potentially)

Diagnostic Steps

1
Inspect transmission fluid level and condition; look for discoloration or burnt smell.
2
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any error codes.
3
Check for any visible leaks around the transmission and differential.
4
Inspect the transmission mount for signs of wear or damage.
5
Test the operation of the gear linkage and shifter mechanism for proper engagement.
6
Listen for noises while the vehicle is in park and during shifting to identify the source.

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
•Socket set
•Wrench set
•Fluid catch pan
•Funnel

Parts Required

•Transmission fluid (specific to Toyota specifications)
•Transmission mount (if damaged)
•Gear linkage components (if worn)

Related Faults

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Diagnostic Steps

1
Inspect transmission fluid level and condition; look for discoloration or burnt smell.
2
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any error codes.
3
Check for any visible leaks around the transmission and differential.
4
Inspect the transmission mount for signs of wear or damage.
5
Test the operation of the gear linkage and shifter mechanism for proper engagement.
6
Listen for noises while the vehicle is in park and during shifting to identify the source.

Solution

1. Preparation

Gather tools: socket set, wrench set, OBD-II scanner, fluid catch pan.
Ensure the vehicle is on a level surface and the engine is off.
Disconnect the battery to avoid any electrical issues.

2. Inspect and Replace Transmission Fluid

Check Fluid Level:
- Locate the transmission dipstick and remove it.
- Wipe clean, reinsert, and pull out again to check fluid level.
Drain Old Fluid:
- Place a fluid catch pan under the transmission drain plug.
- Use a socket to remove the drain plug and allow fluid to drain completely.
Replace Fluid:
- Reinstall the drain plug and torque it to the manufacturer’s specifications.
- Refill with new transmission fluid through the dipstick tube using a funnel, until fluid level is at the proper mark.

3. Inspect and Replace Transmission Mount

Remove the Old Mount:
- Use a socket set to remove the bolts securing the transmission mount.
- Support the transmission with a jack to relieve pressure on the mount.
Install New Mount:
- Position the new mount and secure it with bolts, torqueing to manufacturer specifications.

4. Check Gear Linkage

Inspect Linkage:
- Visually inspect the gear linkage for wear or loose connections.
Adjust/Replace as Needed:
- If adjustments are needed, follow the manufacturer’s specifications for alignment.
- Replace any worn components as necessary.