my Toyota Highlander Third Generation (2014-2019) won't go into gear

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

575 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 servicing the transmission fluid.
•Ensure the vehicle is securely supported on jack stands when working underneath.
•Keep hands clear of moving parts while adjusting the linkage.

Symptoms

•Check engine light illuminated
•Transmission fluid leaking
•Grinding noise when attempting to shift
•Delay in shifting from park to drive
•Unresponsive accelerator pedal
•Dashboard warning lights related to transmission

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, looking for discoloration or burnt smell.
3
Inspect the transmission fluid for leaks around the pan, seals, and hoses.
4
Test the battery voltage to ensure proper power supply to the transmission control module.
5
Examine the gear selector linkage for any disconnections or damage.
6
Check the transmission control module for faults or updates that may need to be applied.

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
•Fluid pump
•Socket set
•Wrench set
•Torque wrench
•Catch pan

Parts Required

•Toyota ATF WS transmission fluid
•Seals or gaskets (if leaks are found)
•Gear selector linkage (if damaged)

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, looking for discoloration or burnt smell.
3
Inspect the transmission fluid for leaks around the pan, seals, and hoses.
4
Test the battery voltage to ensure proper power supply to the transmission control module.
5
Examine the gear selector linkage for any disconnections or damage.
6
Check the transmission control module for faults or updates that may need to be applied.

Solution

1. Preparation

Gather tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and remove it.
2. Inspect the fluid level; if low, add the recommended transmission fluid (Toyota ATF WS).
3. If the fluid is burnt or contaminated, drain the transmission fluid using a fluid pump or drain plug.
4. Replace the old fluid with new transmission fluid following the manufacturer's specifications.
Tools Required: Fluid pump, funnel, catch pan.
Safety Warnings: Allow the vehicle to cool before opening any fluid reservoirs.

3. Inspect and Repair Leak

Sub-steps:
1. Inspect the transmission pan, seals, and hoses for any signs of leakage.
2. Replace any damaged seals or gaskets.
3. Tighten any loose bolts on the transmission pan to prevent further leaks.
4. Refill the transmission with fluid as necessary.
Tools Required: Socket set, torque wrench.
Safety Warnings: Ensure the vehicle is securely supported on jack stands when working underneath.

4. Check Gear Selector Linkage

Sub-steps:
1. Inspect the gear selector linkage for any wear or disconnection.
2. If damaged, replace the linkage with a new component.
3. Adjust the linkage as necessary to ensure smooth operation.
Tools Required: Wrench set.
Safety Warnings: Keep hands clear of moving parts while adjusting the linkage.