Why does my 2020 Toyota Highlander have a check transmission light?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0700, P2714

3 min read

599 words

Problem Statement

Learn about the causes and solutions for the check transmission light on your 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Error Code

P0700, P2714

Affected Component

Transmission

Estimated Time

2-4 hours

Symptoms

•Check Transmission Light illuminated
•Delayed or Harsh Shifting
•Unusual Noises
•Fluid Leaks
•Decreased Performance

Diagnostic Steps

1
Visual Inspection
2
Scan for Diagnostic Trouble Codes (DTC)
3
Test Drive

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
•Screwdrivers
•Torque wrench
•Clean rags
•Transmission fluid
•Funnel
•Safety glasses
•Gloves

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Solution

Check Transmission Light on 2020 Toyota Highlander

Tools Required

OBD-II Scanner
Transmission fluid dipstick (if applicable)
Socket set (ratchet and sockets)
Screwdrivers (flathead and Phillips)
Torque wrench
Clean rags
Transmission fluid (if low)
Funnel
Safety glasses and gloves

Repair Instructions

Step 1: Transmission Fluid Check and Top-Up

Park the Vehicle: Ensure the vehicle is on a level surface and the engine is running.
Check Fluid Level:
- Locate the transmission dipstick (usually found near the rear of the engine bay).
- Pull the dipstick, wipe it clean, reinsert it, and then remove it again to check the fluid level.
Top-Up If Necessary:
- If the fluid is low, use a funnel to add the appropriate type of transmission fluid as specified in the owner's manual.
- Recheck the level after adding fluid.

Step 2: Scan for Codes

Connect OBD-II Scanner:
- Plug the OBD-II scanner into the vehicle’s diagnostic port (usually under the dashboard near the steering column).
Retrieve Codes:
- Follow the scanner instructions to retrieve and document any trouble codes.
Interpret Codes:
- Research the codes to determine the specific transmission issue (e.g., solenoid failure, sensor malfunction).

Step 3: Addressing Common Issues

Solenoid Replacement (if applicable):
- If codes indicate a faulty solenoid, locate the transmission solenoid pack.
- Remove the electrical connector and unscrew the solenoid.
- Replace with a new solenoid and reconnect.
Sensor Replacement (if applicable):
- If a sensor (like the transmission speed sensor) is faulty, locate the sensor on the transmission.
- Disconnect the wiring harness, remove the mounting bolts, and replace the sensor.
- Reconnect the harness and ensure it is secured.
Fluid Leak Repair:
- If leaks are found, identify the source (e.g., pan gasket, output shaft seal).
- Drain the transmission fluid if necessary.
- Replace gaskets or seals as needed.
- Refill transmission fluid.

Step 4: Clear Codes and Test

Clear Codes:
- Use the OBD-II scanner to clear any DTCs from the system.
Test Drive:
- Conduct a test drive to ensure the check transmission light does not reappear and shifting is normal.

Conclusion

If the check transmission light remains illuminated after following these steps, it may indicate a more serious issue that requires professional diagnosis and repair. Consider consulting a qualified automotive technician or a Toyota dealership for advanced diagnostics and repairs.