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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

562 words

Problem Statement

Learn how to diagnose and fix transmission jerking issues in Toyota Highlander (2014-2019). 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 systems.
•Allow the engine to cool before opening the transmission system to prevent burns.

Symptoms

•Jerking or harsh shifting between gears
•Delayed engagement when shifting from park to drive
•Slipping sensation during acceleration
•Unusual noises during shifting (clunking or grinding)
•Check engine light may be illuminated
•Decreased fuel efficiency

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for any stored error codes related to the transmission.
2
Inspect the transmission fluid level and condition; look for discoloration or burnt smell.
3
Check for transmission fluid leaks around seals and gaskets.
4
Inspect the transmission mounts for wear or damage.
5
Test the transmission control module (TCM) for proper function and any fault codes.
6
Examine the throttle position sensor (TPS) for proper operation and signals.

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
•Transmission fluid
•Funnel
•Rags

Parts Required

•Transmission fluid (Toyota Type T-IV)
•Transmission filter (if applicable)
•Transmission pan gasket
•Throttle position sensor (if faulty)
•Transmission mounts (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for any stored error codes related to the transmission.
2
Inspect the transmission fluid level and condition; look for discoloration or burnt smell.
3
Check for transmission fluid leaks around seals and gaskets.
4
Inspect the transmission mounts for wear or damage.
5
Test the transmission control module (TCM) for proper function and any fault codes.
6
Examine the throttle position sensor (TPS) for proper operation and signals.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, transmission fluid, funnel, rags.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission fluid dipstick and check the fluid level.
2. If low, add the correct type of transmission fluid (Toyota Type T-IV).
3. If fluid is dirty or burnt, proceed to drain and replace:
  - Remove the transmission pan bolts using a socket set.
  - Carefully lower the pan to avoid spilling fluid; allow excess fluid to drain.
  - Clean the pan and replace the filter if applicable.
  - Reinstall the pan with a new gasket, torque bolts to manufacturer specifications (typically 7-10 ft-lbs).
  - Refill with new transmission fluid through the dipstick tube.

3. Inspect and Replace Faulty Components

Sub-steps:
1. Inspect the transmission mounts and replace if cracked or worn.
2. Test the TCM with an appropriate diagnostic tool and replace if not functioning correctly.
3. Check the throttle position sensor (TPS) for proper voltage output while accelerating and replace if necessary.

4. Reconnect Battery and Test

Reconnect the battery terminals.
Start the engine and allow it to reach operating temperature.
Test drive the vehicle to check for improvements in shifting behavior.