how to fix P0700 transmission control system malfunction in Toyota Highlander Third Generation (2014...

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

565 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 (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 working on the transmission.

Symptoms

•Check engine light illuminated
•Transmission slipping or harsh shifting
•Delayed engagement when shifting from park to drive or reverse
•Poor acceleration or loss of power
•Unexpected downshifts or upshifts

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and identify any additional transmission-related codes.
2
Inspect the transmission fluid level and condition; check for contamination or burnt smell.
3
Check the wiring and connectors to the transmission control module (TCM) for any signs of damage or corrosion.
4
Examine the vehicle’s battery and charging system to ensure proper voltage is being supplied.
5
Test the TCM for proper operation using a multimeter to check for voltage and ground at the various connectors.
6
Inspect the transmission filter for blockage and the transmission pan for metal shavings or debris.

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
•Torque wrench
•Transmission fluid pump

Parts Required

•Transmission fluid
•Transmission filter (if necessary)
•Transmission control module (if replacement is needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0700 and identify any additional transmission-related codes.
2
Inspect the transmission fluid level and condition; check for contamination or burnt smell.
3
Check the wiring and connectors to the transmission control module (TCM) for any signs of damage or corrosion.
4
Examine the vehicle’s battery and charging system to ensure proper voltage is being supplied.
5
Test the TCM for proper operation using a multimeter to check for voltage and ground at the various connectors.
6
Inspect the transmission filter for blockage and the transmission pan for metal shavings or debris.

Solution

1. Preparation

Gather tools and parts necessary for the repair.
Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid pump.
Parts Required: Transmission fluid, transmission filter (if necessary), TCM (if replacement is needed).
Ensure the vehicle is parked on a flat surface and the engine is turned off.

2. Transmission Fluid Inspection and Replacement

Sub-steps:
1. Locate the transmission dipstick and check the fluid level.
2. If fluid is low, top it off with the correct type of transmission fluid.
3. If the fluid is dirty or burnt, proceed to change it:
  - Remove the transmission pan bolts using a socket set.
  - Carefully lower the pan and drain the old fluid into a suitable container.
  - Replace the transmission filter, if applicable, and clean the pan thoroughly.
  - Reinstall the pan with a new gasket and torque bolts to manufacturer specifications (typically 7-9 ft-lbs).
  - Refill the transmission with the correct type and amount of fluid.

3. TCM Inspection and Replacement

Sub-steps:
1. Disconnect the battery to ensure safety.
2. Locate the TCM (usually near the transmission or under the dashboard).
3. Remove the connectors from the TCM and inspect for corrosion or damage.
4. If testing indicates a malfunctioning TCM, remove it by unscrewing the mounting bolts and carefully detaching it.
5. Install the new TCM by reversing the removal process and reconnecting the battery.