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

3 min read

562 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) that won't shift into gear. Step-by-step guide with tools and tips.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is secure and stable when working underneath it.

Symptoms

•Transmission warning light illuminated on the dashboard
•Engine revs without acceleration when pressing the gas pedal
•Difficulty or inability to engage any gear
•Unusual noises (grinding or whining) when attempting to shift
•Fluid leaks under the vehicle
•Warning messages displayed on the dashboard

Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner for any error codes.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission shift linkage for any disconnections or damage.
4
Examine the brake switch to ensure it is functioning properly, as this can affect shifting.
5
Check for any blown fuses related to the transmission control module.
6
Test the battery voltage to ensure it is within the correct range for proper electrical operation.

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
•Transmission dipstick
•Socket set
•Pliers
•Fuse puller

Parts Required

•Automatic Transmission Fluid (ATF)
•Brake switch (if needed)
•Fuses (if needed)

Related Faults

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Symptoms

•Transmission warning light illuminated on the dashboard

•Engine revs without acceleration when pressing the gas pedal

•Difficulty or inability to engage any gear

•Unusual noises (grinding or whining) when attempting to shift

•Fluid leaks under the vehicle

•Warning messages displayed on the dashboard

Diagnostic Steps

1
Scan the vehicle's onboard computer with an OBD-II scanner for any error codes.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission shift linkage for any disconnections or damage.
4
Examine the brake switch to ensure it is functioning properly, as this can affect shifting.
5
Check for any blown fuses related to the transmission control module.
6
Test the battery voltage to ensure it is within the correct range for proper electrical operation.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Disconnect the negative battery terminal to prevent electrical shorts during the repair.

2. Check Transmission Fluid

Tools Required: Transmission dipstick, funnel, clean rags.
Remove the transmission dipstick, wipe it clean, and reinsert it.
Check the fluid level; if low, add the appropriate ATF (Automatic Transmission Fluid) as specified in the owner's manual until it reaches the proper level.

3. Inspect and Adjust Shift Linkage

Tools Required: Socket set, pliers.
Locate the shift linkage under the vehicle.
Inspect for any loose connections or damage.
If necessary, adjust the linkage according to the service manual specifications.

4. Replace Faulty Brake Switch

Tools Required: Socket set, screwdrivers.
Locate the brake switch mounted on the brake pedal assembly.
Disconnect the electrical connector and remove the switch.
Install a new brake switch and reconnect the electrical connector.

5. Replace Blown Fuses

Tools Required: Fuse puller or pliers.
Locate the fuse box and identify the fuses related to the transmission control module.
Replace any blown fuses with ones of the same amperage.

6. Final Checks

Reconnect the negative battery terminal.
Start the engine and check if the vehicle now shifts into gear.