why is my Toyota Highlander Third Generation (2014-2019) jerking when I change gears

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

521 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 issues in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostics, and repairs.

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 the transmission or working underneath the vehicle.

Symptoms

•Jerking or shuddering during gear shifts
•Delayed engagement when shifting from park to drive or reverse
•Unusual noises during gear changes (clunking or grinding)
•Check engine light illuminated
•Poor acceleration performance
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes to identify any transmission-related issues.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for transmission fluid leaks around seals and gaskets.
4
Test the operation of the transmission control module (TCM) and related sensors.
5
Examine the engine mounts for signs of wear or damage.
6
Inspect the driveshaft and universal joints for play 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
•Transmission fluid
•Funnel
•Clean rags
•Drain pan

Parts Required

•Transmission fluid
•Transmission filter and gasket
•Engine mounts (if damaged)
•Driveshaft or universal joints (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes to identify any transmission-related issues.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for transmission fluid leaks around seals and gaskets.
4
Test the operation of the transmission control module (TCM) and related sensors.
5
Examine the engine mounts for signs of wear or damage.
6
Inspect the driveshaft and universal joints for play or damage.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, transmission fluid, funnel, clean rags.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent any electrical issues.

2. Check and Replace Transmission Fluid

Remove the transmission dipstick and wipe it clean.
Insert the dipstick back into the tube and remove it again to check the fluid level.
- Fluid Level: If low, add the appropriate transmission fluid (check owner's manual for specifications).
If the fluid is dark or has a burnt smell, drain the old fluid.
- Fluid Change Procedure:
- Place a drain pan under the transmission pan.
- Remove the transmission pan bolts and carefully lower it.
- Replace the old filter and gasket.
- Reassemble the pan and refill with new fluid.

3. Inspect and Replace Faulty Components

Check all engine mounts:
- Examine for cracks or separation.
- Replace any damaged mounts using a socket set.
Check the transmission control module (TCM):
- If faulty, replace the TCM following the specific procedures outlined in the service manual.
Inspect and replace any damaged driveshaft or universal joints:
- Remove the driveshaft from the vehicle.
- Replace any worn components and re-install the driveshaft.