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Home/Cars/Toyota/Highlander/Third Generation (2014-2019)/how to troubleshoot P0700 code on my Toyota Highlander Third Generation (2014-2019)

how to troubleshoot P0700 code on my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Severity: highDifficulty: mediumError Code: P07002-4 hours
3 min read
497 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 troubleshoot and fix P0700 transmission control system malfunction in Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures.

Error Code
P0700
Component
Transmission
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening the transmission fluid fill cap.

Symptoms

  • •Check engine light illuminated
  • •Harsh shifting or slippage during gear changes
  • •Transmission stuck in one gear or fails to shift
  • •Decreased fuel efficiency
  • •Unusual noises from the transmission area

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0700 and any additional transmission-related codes.
  2. 2Check the transmission fluid level and condition; ensure it is at the appropriate level and is not burnt or contaminated.
  3. 3Inspect the wiring and connectors to the transmission control module for damage, corrosion, or loose connections.
  4. 4Test the transmission solenoids for proper operation using a multimeter.
  5. 5Verify that the vehicle's battery and charging system are functioning properly to rule out electrical issues.
  6. 6Conduct a visual inspection of the transmission for any signs of leaks or physical damage.

Solution

Solution

1. Preparation

  • Gather tools: OBD-II scanner, multimeter, fluid catch pan, socket set, torque wrench.
  • 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

  • Remove the transmission fluid dipstick.
  • Check the fluid level; if low, add the manufacturer-recommended transmission fluid.
  • If the fluid is dark or burnt, drain the transmission fluid into a catch pan.
  • Replace with new fluid as per manufacturer specifications.

3. Inspect and Repair Wiring

  • Visually inspect the wiring harness and connectors leading to the TCM.
  • Repair any frayed wires or corroded connectors.
  • Ensure all connections are tight and clean.

4. Test and Replace Transmission Solenoids

  • Disconnect the electrical connectors from the solenoids.
  • Use a multimeter to check for continuity and resistance according to specifications.
  • If any solenoid is found defective, replace it with a new unit.

5. Reconnect and Clear Codes

  • Reconnect the battery and all connectors.
  • Use an OBD-II scanner to clear any stored trouble codes.
  • Start the engine and allow it to reach normal operating temperature.

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
  • Fluid catch pan
  • Socket set
  • Torque wrench

Parts Required

  • Transmission fluid
  • Transmission solenoids (if needed)

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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