how to fix the P0700 code in Toyota Highlander Third Generation (2014-2019)?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

548 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 P0700 transmission fault in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0700

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.

Symptoms

•Check engine light illuminated
•Transmission shifting issues (hard shifts or slipping)
•Delayed engagement when shifting into gear
•Unusual noises from the transmission
•Decreased fuel efficiency
•Transmission overheating

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any specific transmission-related codes.
2
Inspect the transmission fluid level and condition (check for discoloration or burning smell).
3
Check the wiring and connectors to the transmission control module (TCM) for damage or corrosion.
4
Perform a visual inspection of the transmission for leaks or physical damage.
5
Test the transmission solenoids for proper operation using a multimeter.
6
Inspect the throttle position sensor (TPS) for proper function, as it may affect transmission behavior.

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
•Socket set
•Multimeter
•Torque wrench
•Transmission fluid pump
•Drain pan
•Electrical contact cleaner

Parts Required

•Toyota WS transmission fluid
•Transmission pan gasket
•Transmission solenoids (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any specific transmission-related codes.
2
Inspect the transmission fluid level and condition (check for discoloration or burning smell).
3
Check the wiring and connectors to the transmission control module (TCM) for damage or corrosion.
4
Perform a visual inspection of the transmission for leaks or physical damage.
5
Test the transmission solenoids for proper operation using a multimeter.
6
Inspect the throttle position sensor (TPS) for proper function, as it may affect transmission behavior.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Locate the transmission dipstick (if equipped) or the fill plug.
Remove the dipstick or fill plug and check fluid level.
If low, add the manufacturer-recommended transmission fluid (Toyota WS).
If fluid is dark or burnt, proceed to drain and replace the fluid.
- Tools Required: Socket set, transmission fluid pump, drain pan.
- Safety Warnings: Ensure engine is cool before performing fluid checks.

3. Inspect and Repair Electrical Connections

Visually inspect the wiring harness connected to the TCM and transmission solenoids.
Clean any corrosion or dirt from connectors using electrical contact cleaner.
If damage is found, repair or replace the affected wiring and connectors.

4. Test and Replace Transmission Solenoids (if necessary)

Remove the transmission pan to access the solenoids.
- Tools Required: Socket set, torque wrench, gasket scraper.
Disconnect the electrical connectors from the solenoids.
Test each solenoid using a multimeter for resistance as per manufacturer specifications.
Replace any faulty solenoids and reinstall the transmission pan with a new gasket.
- Torque bolts to manufacturer specifications.

5. Reconnect Battery and Clear Codes

Reconnect the battery.
Use the OBD-II scanner to clear any stored codes.
Start the engine and allow it to reach operating temperature.