my Toyota Highlander Third Generation (2014-2019) won't go into gear, what could it be?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

559 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 battery before working on electrical systems.
•Allow the engine to cool before opening the transmission pan.

Symptoms

•Transmission warning light illuminated on the dashboard
•Engine revs without corresponding vehicle movement
•Difficulty shifting from Park to Drive or Reverse
•Grinding or clunking noises during attempted gear engagement
•Fluid leaks under the vehicle
•Unresponsive accelerator pedal

Diagnostic Steps

1
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
2
Check the transmission fluid level and condition; inspect for discoloration or burning smell.
3
Inspect the transmission linkage and shift cable for damage or disconnection.
4
Examine the condition of the brake switch; ensure it is functioning properly.
5
Inspect the transmission control module (TCM) for any signs of damage or malfunction.
6
Test the battery voltage and connections, ensuring they are secure and within range.

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
•Multimeter
•Screwdriver set
•Transmission fluid pump

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle's computer for any diagnostic trouble codes (DTCs) using an OBD-II scanner.
2
Check the transmission fluid level and condition; inspect for discoloration or burning smell.
3
Inspect the transmission linkage and shift cable for damage or disconnection.
4
Examine the condition of the brake switch; ensure it is functioning properly.
5
Inspect the transmission control module (TCM) for any signs of damage or malfunction.
6
Test the battery voltage and connections, ensuring they are secure and within range.

Solution

1. Preparation

Gather all necessary tools and materials.
Ensure the vehicle is on a level surface and safely secured with wheel chocks.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick and wipe it clean.
2. Reinsert the dipstick and remove it again to check fluid level.
3. If fluid is low, add the recommended type of transmission fluid (Toyota WS).
4. If fluid is dirty or smells burnt, drain and replace it.
5. To drain, remove the transmission pan bolts and let the fluid flow out into a container.
6. Replace the filter if necessary, then reinstall the pan with a new gasket and torque to manufacturer specifications.

3. Inspect and Adjust Transmission Linkage

Sub-steps:
1. Locate the transmission linkage and shift cable.
2. Visually inspect for any damage or disconnection.
3. If misaligned, adjust the linkage as per manufacturer specifications.
4. Secure any loose connections and test the linkage movement.

4. Check Brake Switch Functionality

Sub-steps:
1. Locate the brake light switch under the dashboard.
2. Test the switch for continuity with a multimeter while pressing the brake pedal.
3. If faulty, replace the brake switch and adjust if necessary.

5. Examine Transmission Control Module (TCM)

Sub-steps:
1. Locate the TCM (typically found near the transmission or under the dashboard).
2. Inspect the wiring harness for damage or corrosion.
3. If necessary, replace the TCM and reprogram it according to the manufacturer’s instructions.