my Toyota Highlander Third Generation (2014-2019) does not shift properly what could be the issue

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

535 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 shifting issues in the 2014-2019 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 the battery before working on electrical systems.
•Allow the engine and transmission to cool before opening the transmission pan to avoid burns.

Symptoms

•Delayed or harsh shifting between gears
•Transmission slipping out of gear
•Unusual noise when shifting (grinding or whining)
•Check engine light illuminated
•Decrease in fuel efficiency
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify transmission-related codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission linkage and cables for proper adjustment and any signs of damage.
4
Verify the operation of the vehicle speed sensor (VSS) using a multimeter.
5
Test drive the vehicle to replicate the shifting issue while monitoring engine RPM and speed.
6
Check for any TSBs (Technical Service Bulletins) related to transmission issues for the specific model.

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
•Wrench set
•Socket set
•Torque wrench
•Multimeter
•Fluid catch container

Parts Required

•Transmission filter
•Transmission fluid (Toyota Type T-IV)
•Transmission pan gasket
•Vehicle speed sensor (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify transmission-related codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission linkage and cables for proper adjustment and any signs of damage.
4
Verify the operation of the vehicle speed sensor (VSS) using a multimeter.
5
Test drive the vehicle to replicate the shifting issue while monitoring engine RPM and speed.
6
Check for any TSBs (Technical Service Bulletins) related to transmission issues for the specific model.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Wear appropriate safety gear, including gloves and safety glasses.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Use a wrench to remove the transmission fluid dipstick.
2. Inspect fluid level; if low, add appropriate ATF (Toyota Type T-IV).
3. If fluid is dark or has a burnt smell, consider a fluid change.
4. To change fluid, remove the transmission pan (ensure to have a container for fluid).
5. Replace the transmission filter and gasket.
6. Refill with fresh transmission fluid as per manufacturer's specifications (approximately 4-6 quarts).

3. Adjust Transmission Linkage

Sub-steps:
1. Locate the transmission linkage on the driver's side of the engine bay.
2. Inspect for any loose or damaged components.
3. If adjustment is needed, loosen the retaining bolts and adjust to the correct position.
4. Tighten the bolts to the specified torque (usually around 10-15 ft-lbs).

4. Replace Vehicle Speed Sensor (if faulty)

Sub-steps:
1. Disconnect the negative battery terminal.
2. Locate the vehicle speed sensor on the transmission.
3. Remove the electrical connector and unscrew the sensor.
4. Install the new speed sensor and reconnect the electrical connector.
5. Reconnect the negative battery terminal.