why does my Toyota Highlander Third Generation (2014-2019) transmission jerk when I accelerate

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 issues in the 2014-2019 Toyota Highlander. Step-by-step guide with symptoms and solutions.

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 fluid system.

Symptoms

•Jerking or shuddering during acceleration
•Delay in shifting or harsh shifts between gears
•Check engine light illuminated
•Unusual noises (clunking or grinding) during gear changes
•Decreased fuel economy
•Transmission fluid leaks (visible under the vehicle)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission or engine-related faults.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission fluid filter for clogs or damage.
4
Perform a visual inspection of the transmission for any signs of external leaks or damage.
5
Test drive the vehicle to observe the behavior of the transmission under various conditions (slow acceleration, rapid acceleration).
6
Check engine performance parameters such as throttle position and engine RPM during acceleration.

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
•Drain pan
•Funnel
•Transmission fluid (Toyota WS)

Parts Required

•Transmission fluid (Toyota WS)
•Transmission fluid filter
•Gasket for transmission pan

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission or engine-related faults.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission fluid filter for clogs or damage.
4
Perform a visual inspection of the transmission for any signs of external leaks or damage.
5
Test drive the vehicle to observe the behavior of the transmission under various conditions (slow acceleration, rapid acceleration).
6
Check engine performance parameters such as throttle position and engine RPM during acceleration.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Disconnect the battery to ensure safety while working on the vehicle.

2. Check and Change Transmission Fluid

Sub-steps:
1. Remove the transmission fluid dipstick and wipe it clean.
2. Insert the dipstick back into the tube and pull it out to check the fluid level.
3. If low, add the appropriate type of transmission fluid (Toyota WS fluid) using a funnel.
4. If the fluid is dirty or burnt, drain the old fluid using a drain pan and remove the transmission pan.
5. Replace the transmission filter and clean the pan.
6. Reinstall the transmission pan with new gasket and torque to manufacturer specifications.

3. Inspect and Replace Transmission Filter (if necessary)

Sub-steps:
1. Remove bolts securing the transmission pan and carefully lower it.
2. Remove the old filter and replace it with a new one.
3. Reinstall the pan and ensure a proper seal.

4. Check Transmission Control Module (TCM)

Sub-steps:
1. Inspect the wiring and connectors leading to the TCM for damage or corrosion.
2. If necessary, reset the TCM by disconnecting the battery for 10 minutes and reconnecting it.

5. Test Drive

Sub-steps:
1. Reconnect the battery and start the engine.
2. Take the vehicle for a test drive to confirm that the jerking issue has been resolved.