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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

560 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 prevent it from going into gear. Step-by-step guide included.

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 transmission fluid.

Symptoms

•Transmission warning light illuminated on the dashboard
•Difficulty shifting from Park to Drive/Reverse
•Unresponsive accelerator pedal
•Grinding or unusual noises when attempting to shift
•Fluid leaks underneath the vehicle
•Engine revs without the vehicle moving

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition using the dipstick; look for discoloration or burning smell.
3
Inspect the transmission linkage for any signs of damage or disconnection.
4
Verify the operation of the brake pedal switch, as it may prevent shifting out of Park.
5
Test the battery voltage to ensure the electrical system is functioning properly; low voltage can affect shifting.
6
Examine the transmission fluid for leaks around seals and gaskets.

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 fluid dipstick
•Socket set
•Multimeter
•Screwdriver
•Adjustable wrench
•Fuse puller
•Transmission fluid

Parts Required

•Toyota ATF WS transmission fluid
•Brake pedal switch (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related fault codes.
2
Check the transmission fluid level and condition using the dipstick; look for discoloration or burning smell.
3
Inspect the transmission linkage for any signs of damage or disconnection.
4
Verify the operation of the brake pedal switch, as it may prevent shifting out of Park.
5
Test the battery voltage to ensure the electrical system is functioning properly; low voltage can affect shifting.
6
Examine the transmission fluid for leaks around seals and gaskets.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shorts during repairs.
Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Check Transmission Fluid

Sub-steps:
- Remove the transmission dipstick and wipe it clean.
- Reinsert the dipstick, then remove it again to check the fluid level.
- If low, add the recommended transmission fluid (Toyota ATF WS) to the fill point.
Tools Required: Transmission fluid, funnel.

3. Inspect and Adjust Transmission Linkage

Sub-steps:
- Locate the transmission linkage at the base of the steering column.
- Inspect for any looseness or disconnection; if found, reattach or tighten the linkage.
- Adjust the linkage as necessary by loosening the adjustment nut and moving it to the correct position.
Tools Required: Socket set, adjustable wrench.

4. Replace Brake Pedal Switch (if necessary)

Sub-steps:
- Locate the brake pedal switch under the dashboard.
- Disconnect the wiring harness from the switch.
- Unscrew the switch from the mounting bracket and install the new switch.
- Reconnect the wiring harness.
Tools Required: Screwdriver, socket set, replacement brake pedal switch.

5. Examine for Electrical Issues

Sub-steps:
- Use a multimeter to check the battery voltage; it should be above 12.4 volts.
- Inspect the fuses related to the transmission control module (TCM) in the fuse box.
- Replace any blown fuses and test the system again.
Tools Required: Multimeter, fuse puller.