why does my Toyota Highlander Third Generation (2014-2019) transmission jerk when shifting gears

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

567 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 (2014-2019). 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 the battery before working on electrical systems.
•Allow the engine to cool before opening the transmission or working with fluids.

Symptoms

•Jerking or harsh shifting between gears
•Delayed or hard engagement when shifting from park to drive or reverse
•Check engine light illuminated
•Slipping or unexpected loss of power during acceleration
•Fluid leaks under the vehicle
•Unusual noises during gear changes (clunking or grinding)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition (color and smell).
3
Check for any visible leaks in the transmission system.
4
Examine the transmission control module (TCM) for faults or malfunctions.
5
Test the transmission solenoids for proper operation using a multimeter.
6
Inspect the engine and transmission mounts for 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
•Torque wrench
•Multimeter
•Drain pan

Parts Required

•Toyota ATF WS transmission fluid
•Transmission filter (if applicable)
•Transmission solenoids (if applicable)
•Transmission pan gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition (color and smell).
3
Check for any visible leaks in the transmission system.
4
Examine the transmission control module (TCM) for faults or malfunctions.
5
Test the transmission solenoids for proper operation using a multimeter.
6
Inspect the engine and transmission mounts for wear or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Fluid Check and Replacement

Step 1: Remove the transmission dipstick and check fluid level.
Step 2: If fluid is low, add the recommended transmission fluid (usually Toyota ATF WS) until the proper level is reached.
Step 3: If fluid appears dark or burnt, drain the old fluid using a drain pan.
Step 4: Replace the transmission fluid filter if equipped.
Step 5: Refill with fresh transmission fluid through the dipstick tube.

3. Solenoid Inspection and Replacement

Step 1: Remove the transmission pan (use a torque wrench to avoid over-tightening).
Step 2: Visually inspect solenoids for damage or wear.
Step 3: If faulty, disconnect the wiring harness and remove the solenoids.
Step 4: Replace with new solenoids and reconnect wiring.

4. TCM Reset or Replacement

Step 1: Locate the TCM, which is usually found near the transmission.
Step 2: Disconnect the wiring harness and remove bolts securing the TCM.
Step 3: Replace the TCM if it is defective, or reset it by disconnecting the battery for 10 minutes and reconnecting.

5. Final Assembly

Step 1: Reinstall the transmission pan with a new gasket and torque to specifications.
Step 2: Reconnect the negative battery terminal.
Step 3: Start the vehicle and let it warm up to operating temperature.