how to fix my Toyota Highlander Third Generation (2014-2019) that won’t shift into gear

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

638 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 issues 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.

Symptoms

•Transmission warning light illuminated on the dashboard
•Engine revs without vehicle movement
•Difficulty engaging gears or slipping out of gear
•Unusual noises when attempting to shift
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition; ensure it is at the correct level and not burnt or contaminated.
3
Inspect the transmission linkage and cables for proper connection and any signs of wear or damage.
4
Test the brake light switch; a faulty switch can prevent the vehicle from shifting out of park.
5
Inspect the transmission filter for blockages or damage if the fluid level is low or dirty.
6
Check for any electrical issues, including fuses and wiring connected to the transmission control module.

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
•Multimeter
•Transmission fluid
•Funnel
•Rags

Parts Required

•Transmission fluid
•Brake light switch
•Transmission filter (if applicable)
•Gasket for transmission pan (if applicable)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition; ensure it is at the correct level and not burnt or contaminated.
3
Inspect the transmission linkage and cables for proper connection and any signs of wear or damage.
4
Test the brake light switch; a faulty switch can prevent the vehicle from shifting out of park.
5
Inspect the transmission filter for blockages or damage if the fluid level is low or dirty.
6
Check for any electrical issues, including fuses and wiring connected to the transmission control module.

Solution

1. Preparation

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

2. Check and Refill Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick (if equipped) or the fill plug.
2. Remove the dipstick or fill plug and wipe clean.
3. Insert the dipstick back and remove to check fluid level.
4. If low, use a funnel to refill with the recommended transmission fluid (typically Toyota Type T-IV).
5. Recheck the level and ensure it is within the proper range.

3. Inspect and Adjust Transmission Linkage

Sub-steps:
1. Locate the transmission linkage and cables connected to the transmission.
2. Check for any signs of wear, damage, or disconnection.
3. If misaligned, adjust the linkage according to the service manual specifications.
4. Tighten any loose connections and ensure all components are securely attached.

4. Replace Brake Light Switch

Sub-steps:
1. Locate the brake light switch, often found near the brake pedal assembly.
2. Disconnect the electrical connector from the switch.
3. Remove the switch from its mounting bracket.
4. Install the new brake light switch and reconnect the electrical connector.
5. Test the switch operation by pressing the brake pedal; the brake lights should illuminate.

5. Inspect and Replace Transmission Filter (if necessary)

Sub-steps:
1. Remove the transmission pan (if applicable) by loosening the bolts with a socket set.
2. Carefully lower the pan and drain the fluid into a container.
3. Remove the old transmission filter and replace it with a new one.
4. Clean any debris from the transmission pan and reinstall it with a new gasket.
5. Refill the transmission fluid as per the specifications.