how to fix P0700 transmission trouble code on 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

561 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 trouble code 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 opening the transmission fluid reservoir.

Symptoms

•Check engine light illuminated
•Erratic shifting or failure to shift
•Transmission slipping or harsh engagement
•Reduced acceleration or power
•Increased fuel consumption

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and any related codes.
2
Inspect the transmission fluid level and condition; look for discoloration or burning smell.
3
Check the wiring and connectors to the transmission control module (TCM) for damage or corrosion.
4
Test the TCM for proper voltage and ground using a multimeter.
5
Inspect the transmission range sensor for proper operation.
6
Verify the functionality of the vehicle speed sensors (VSS).

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
•Multimeter
•Socket set
•Screwdrivers
•Torque wrench

Parts Required

•Toyota Type T-IV transmission fluid
•Transmission range sensor (if found defective)
•Transmission control module (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and any related codes.
2
Inspect the transmission fluid level and condition; look for discoloration or burning smell.
3
Check the wiring and connectors to the transmission control module (TCM) for damage or corrosion.
4
Test the TCM for proper voltage and ground using a multimeter.
5
Inspect the transmission range sensor for proper operation.
6
Verify the functionality of the vehicle speed sensors (VSS).

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, and screwdrivers.
Ensure the vehicle is parked on a level surface and the engine is turned off before starting work.

2. Transmission Fluid Inspection and Change

1.1. Remove the transmission dipstick and check fluid level.
1.2. If fluid is low, top off with Toyota Type T-IV transmission fluid.
1.3. If fluid is dirty or burnt, drain the transmission fluid by removing the drain plug.
1.4. Replace with new Toyota Type T-IV fluid, ensuring proper amount based on the vehicle's specifications (approximately 4-5 quarts for a drain and refill).

3. Wiring and Connector Inspection

3.1. Carefully inspect the wiring harness connected to the TCM for any frays or signs of wear.
3.2. Disconnect the connectors, clean them with electrical contact cleaner, and reconnect securely.
3.3. Replace any damaged wiring or connectors as necessary.

4. TCM Testing

4.1. Using a multimeter, check the voltage at the TCM harness while the ignition is in the ON position (should be around 12V).
4.2. If voltage is not present, trace the wiring back to the battery and fuse box for any breaks.
4.3. If voltage is present but the P0700 persists, consider replacing the TCM.

5. Transmission Range Sensor Check

5.1. Locate the transmission range sensor and check for proper alignment and secure mounting.
5.2. Test the sensor's output voltage while moving the gear selector through all positions with a multimeter.
5.3. Replace the sensor if readings are out of spec or if it fails to return to the neutral position.