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Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/how to resolve P0700 transmission control system malfunction in Toyota Highlander Fourth Generation...

how to resolve P0700 transmission control system malfunction in Toyota Highlander Fourth Generation...

Toyota Highlander Fourth Generation (2020-present)

Severity: highDifficulty: mediumError Code: P07002-4 hours
3 min read
503 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 control system malfunction in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0700
Component
Transmission
Repair Time
2-4 hours

Safety Warnings

  • ⚠Always allow the engine to cool before working on the transmission.
  • ⚠Ensure proper lifting and support procedures when elevating the vehicle.

Symptoms

  • •Check engine light illuminated
  • •Transmission slipping or erratic shifting
  • •Delayed engagement when shifting from park to drive or reverse
  • •Engine stalling during gear changes
  • •Poor acceleration response
  • •Transmission fluid leaks

Diagnostic Steps

  1. 1Scan the vehicle's ECU for trouble codes using an OBD-II scanner to retrieve additional fault codes related to the transmission.
  2. 2Inspect the transmission fluid level and condition; check for contaminants or burnt smell.
  3. 3Check the wiring and connectors related to the transmission control module (TCM) for damage or corrosion.
  4. 4Test the TCM functionality with a multimeter to ensure it’s receiving proper voltage and signals.
  5. 5Inspect the transmission for mechanical issues such as worn gears or damaged components.
  6. 6Review the vehicle's service history for any previous transmission repairs or related issues.

Solution

Solution

1. Preparation

  • Gather necessary tools and ensure the vehicle is on a flat surface.
  • Disconnect the negative battery terminal to prevent electrical shorts.
  • Elevate the vehicle using jack stands if needed for better access to the transmission.

2. Inspect and Replace Transmission Fluid

  • Sub-steps:
    1. Remove the transmission drain plug using a socket set to drain old fluid.
    2. Inspect the fluid for contaminants or burnt odor; replace if necessary.
    3. Reinstall the drain plug and tighten to specification (typically 20-30 ft-lbs).
    4. Fill the transmission with new fluid as per manufacturer specifications (check owner's manual for fluid type and capacity).

3. Check and Repair Wiring/Connectors

  • Sub-steps:
    1. Visually inspect the wiring harness leading to the TCM for fraying or damage.
    2. Clean any corrosion from connectors using electrical contact cleaner.
    3. Reconnect any loose or damaged connectors securely.
    4. If damaged wires are found, repair or replace them as necessary.

4. Replace Transmission Control Module (if necessary)

  • Sub-steps:
    1. Locate the TCM, typically found near the transmission or under the dashboard.
    2. Disconnect the electrical connectors from the TCM.
    3. Remove the mounting bolts and take out the old TCM.
    4. Install the new TCM and secure it with mounting bolts, torquing them to manufacturer specifications.
    5. Reconnect electrical connectors ensuring they are secure.

5. Reconnect Battery and Test Drive

  • Sub-steps:
    1. Reconnect the negative battery terminal.
    2. Start the engine and allow it to idle for a few moments.
    3. Take the vehicle for a test drive, monitoring transmission performance and any warning lights.

Tools Required:

  • OBD-II scanner
  • Socket set
  • Multimeter
  • Torque wrench
  • Electrical contact cleaner

Parts Required:

  • Transmission fluid (specific type as per the owner's manual)
  • Transmission control module (if replacement is necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

  • Always allow the engine to cool before working on the transmission.
  • Ensure proper lifting and support procedures when elevating the vehicle.

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
  • Electrical contact cleaner

Parts Required

  • Transmission fluid (specific type as per the owner's manual)
  • Transmission control module (if replacement is necessary)

Additional Information

Error CodeP0700
Component

Transmission

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

5 items

Parts

2 items

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