how to fix a transmission that jerks when shifting in my Toyota Highlander?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

586 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 transmission jerking in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Jerking sensation during shifting between gears
•Delayed engagement when shifting from park to drive/reverse
•Unusual noises (grinding or whining) during shifting
•Check engine light illuminated
•Poor acceleration or power delivery

Diagnostic Steps

1
Scan the vehicle's computer for any error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; ensure it is at the correct level and not burnt or contaminated.
3
Inspect the transmission for visible leaks around seals and gaskets.
4
Verify the condition of the transmission filter; consider replacing if clogged.
5
Test the throttle position sensor (TPS) and ensure it is functioning properly.
6
Check the condition of the engine mounts for excessive wear or damage.

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
•Fluid pump
•Pliers
•Multimeter

Parts Required

•Transmission fluid
•Transmission filter
•Gasket for transmission pan
•Throttle position sensor (if replacement needed)
•Engine mounts (if replacement needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle's computer for any error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; ensure it is at the correct level and not burnt or contaminated.
3
Inspect the transmission for visible leaks around seals and gaskets.
4
Verify the condition of the transmission filter; consider replacing if clogged.
5
Test the throttle position sensor (TPS) and ensure it is functioning properly.
6
Check the condition of the engine mounts for excessive wear or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on a level surface and securely raised using jack stands.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Tools Required: Socket set, fluid pump, transmission fluid.
Remove the transmission fluid dipstick and check fluid level; add fluid if low.
If fluid is burnt or dirty, drain the transmission fluid using a socket set to remove the drain plug.
Replace with new transmission fluid as specified in the owner’s manual (typically Dexron III or IV).
Reinstall the drain plug and refill the transmission with the appropriate fluid through the dipstick tube.

3. Replace Transmission Filter

Tools Required: Socket set, pliers, new transmission filter and gasket.
Remove the transmission pan by loosening the bolts with a socket set.
Carefully detach the pan and drain any remaining fluid.
Remove the old filter by unbolting it and attach the new filter using the provided hardware.
Clean the transmission pan and install a new gasket before reinstalling the pan.

4. Inspect and Replace Engine Mounts (if necessary)

Tools Required: Socket set, pry bar.
Visually inspect the engine mounts for cracks or excessive wear.
If damaged, remove the bolts securing the mount to the engine and frame using a socket set.
Replace with new engine mounts and torque to manufacturer specifications.

5. Test Throttle Position Sensor

Tools Required: Multimeter.
Disconnect the TPS connector, and use a multimeter to measure the resistance while moving the throttle.
Compare readings to specifications in the service manual; replace the TPS if out of range.