how to fix a Toyota Highlander that won’t go into gear

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

555 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 a Toyota Highlander that won't go into gear. 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 inspecting the transmission components.

Symptoms

•Engine starts but does not engage in any gear
•Transmission warning light illuminated on the dashboard
•Fluid leaks underneath the vehicle
•Unusual noises when attempting to shift (grinding or clunking)
•Gear shifter feels loose or does not move smoothly

Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick.
2
Scan the vehicle's onboard diagnostics (OBD-II) for any error codes related to the transmission.
3
Inspect the transmission linkage for any visible damage or disconnection.
4
Check for any blown fuses related to the transmission control module.
5
Test the brake switch to ensure it is functioning correctly, as it may prevent shifting.
6
Inspect the transmission fluid for contamination or burnt smell.

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

•Socket set
•Wrench set
•Fluid catch pan
•OBD-II scanner

Parts Required

•Transmission fluid (manufacturer's specification)
•Transmission filter (if applicable)
•Brake switch (if faulty)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Check the transmission fluid level and condition using the dipstick.
2
Scan the vehicle's onboard diagnostics (OBD-II) for any error codes related to the transmission.
3
Inspect the transmission linkage for any visible damage or disconnection.
4
Check for any blown fuses related to the transmission control module.
5
Test the brake switch to ensure it is functioning correctly, as it may prevent shifting.
6
Inspect the transmission fluid for contamination or burnt smell.

Solution

1. Preparation

Gather tools and ensure the vehicle is on a flat surface.
Disconnect the negative battery terminal to prevent electrical shorts.
Tools Required: Socket set, wrench set, fluid catch pan, OBD-II scanner.

2. Check and Replace Transmission Fluid

Remove the transmission dipstick and check fluid level; if low, add the manufacturer's recommended transmission fluid.
If the fluid appears dirty or burnt, drain the old fluid.
- Place a fluid catch pan under the transmission pan.
- Remove the transmission pan bolts using a socket and wrench.
- Carefully lower the pan and allow old fluid to drain completely.
Replace the transmission filter if applicable, following the manufacturer's guidelines.
Reinstall the pan with a new gasket and torque to specifications (check service manual for exact torque values).

3. Inspect and Adjust Transmission Linkage

Locate the transmission linkage under the vehicle.
Check for any disconnections or damage to the linkage.
If adjustment is needed, loosen the adjustment nuts and reposition the linkage according to specifications, then retighten the nuts.

4. Replace Faulty Components (if applicable)

If diagnostic steps indicate a faulty brake switch or blown fuses, replace these components.
- For brake switch:
  - Disconnect the wiring harness.
  - Remove the retaining clip and the switch.
  - Install the new switch and reconnect wiring.
- For fuses:
  - Locate the fuse box and identify the faulty fuse.
  - Remove the old fuse using fuse pullers.
  - Replace with a new fuse of the same rating.