how to fix P0700 code on Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, transmission fluid, and cleaning supplies.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the battery to prevent electrical shorts while working on the transmission.

2. Inspect and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level.
  2. If low, add the recommended transmission fluid (consult owner's manual for specifications).
  3. If the fluid is dark or has a burnt smell, drain and replace the fluid:
     • Locate the transmission drain plug, remove it, and allow fluid to drain completely.
     • Replace the drain plug and torque to manufacturer specifications.
     • Refill with the recommended transmission fluid through the dipstick tube.

3. Repair or Replace Transmission Control Module (TCM)

• Sub-steps:
  1. Locate the TCM, typically found under the dashboard or near the transmission.
  2. Disconnect the wiring harness from the TCM.
  3. Remove the mounting bolts for the TCM and take it out.
  4. Install the new TCM, tightening the bolts to the manufacturer’s specifications.
  5. Reconnect the wiring harness securely.

4. Inspect and Replace Transmission Solenoids

• Sub-steps:
  1. Remove the transmission pan to access the solenoids (may require draining transmission fluid again).
  2. Disconnect the wiring connectors from the solenoids and remove them from the valve body.
  3. Install new solenoids in the reverse order of removal, ensuring they are seated properly.
  4. Reinstall the transmission pan, applying a new gasket if necessary, and torque the bolts to specifications.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to erase the P0700 code and any other related codes.
• Ensure all connections are tight and secure.