how to fix P0702 code in Toyota Tacoma N300 (2016-Present)

Learn how to diagnose and fix P0702 transmission control issues in Toyota Tacoma N300. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Wiring/Connectors

• Sub-steps:
  1. Remove any protective covers or panels to access the wiring harness connected to the TCM.
  2. Inspect the wiring for frays, breaks, or corrosion; repair or replace as necessary.
  3. Clean and reconnect any corroded connectors, ensuring a tight fit.

3. Replace Transmission Range Sensor (if faulty)

• Tools Required: Socket set, torque wrench, multimeter
• Sub-steps:
  1. Locate the transmission range sensor on the transmission.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the mounting bolts using a socket set.
  4. Carefully remove the old sensor and install the new one.
  5. Torque the mounting bolts to the manufacturer’s specification (typically around 10-15 ft-lbs).
  6. Reconnect the electrical connector.

4. Refill Transmission Fluid (if necessary)

• Sub-steps:
  1. Check the transmission fluid level and add fluid as needed; use Toyota WS fluid as specified.
  2. Start the engine and allow it to warm up, then cycle through the gears to ensure fluid circulation.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear the P0702 code from the ECM.
  3. Start the engine and check for any warning lights.