Symptoms of a Failing Transmission in a 2022 Toyota Highlander

A failing transmission can lead to significant performance issues and potential safety hazards in your vehicle. Here are the common symptoms you may experience in a 2022 Toyota Highlander:

Step 1: Visual Inspection

• Tools Required: Flashlight
• Inspect the transmission fluid level and condition through the dipstick; check for dark fluid or burnt smell.
• Check for any visible leaks under the vehicle.

Step 2: Scan for Codes

• Tools Required: OBD-II Scanner
• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Retrieve any trouble codes that may indicate transmission issues (e.g., P0700 or other specific transmission-related codes).

Step 3: Test Drive

• Note the conditions under which the problems occur (e.g., speed, temperature).
• Pay attention to gear shifting, acceleration, and any unusual noises.

Step 4: Fluid Condition Check

• Tools Required: Clean rag, transmission fluid tester (if available)
• Check the color and consistency of the transmission fluid; it should be bright red and not have a burnt smell.
• If the fluid is dark or has particulates, a fluid change or flush may be necessary.

Step 5: Electrical Components Check

• Tools Required: Multimeter
• Test the transmission solenoids and connectors for proper voltage and continuity.
• Inspect the wiring harness for any signs of wear or damage.

Repair Instructions

Step 1: Fluid Change

If the fluid is dirty or low:

1. Tools Required: Transmission fluid, funnel, wrench set, drain pan, new transmission filter (if applicable)
2. Raise the vehicle using jack stands.
3. Place a drain pan under the transmission pan.
4. Remove the transmission pan bolts and allow fluid to drain.
5. Replace the filter if applicable and clean the pan.
6. Reinstall the pan and refill with the appropriate type and amount of transmission fluid.

Step 2: Replace Transmission Solenoid

If codes indicate a solenoid issue:

1. Tools Required: Socket set, replacement solenoid
2. Disconnect the battery.
3. Remove the transmission pan to access the solenoids.
4. Disconnect the wiring harness from the faulty solenoid.
5. Remove the old solenoid and install the new one.
6. Reinstall the pan and refill the transmission fluid.

Step 3: Internal Transmission Repair

If internal components are failing:

1. Tools Required: Transmission jack, comprehensive tools for transmission disassembly
2. Remove the transmission from the vehicle.
3. Disassemble the transmission to inspect internal components (clutches, gears, valve body).
4. Replace any damaged or worn components.
5. Reassemble the transmission and reinstall it in the vehicle.

Step 4: Professional Assistance

If issues persist or if you are not comfortable performing repairs:

• Consult a certified transmission specialist for further diagnosis and repair.

By following these detailed steps, you can accurately diagnose and address transmission issues in your 2022 Toyota Highlander. Remember, regular maintenance and timely repairs can help prevent transmission failures.