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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fluid catch pan, funnel
• Ensure the vehicle is on level ground and the engine is off. Disconnect the negative battery cable for safety.

2. Check and Replace Transmission Fluid

• Fluid Inspection:
  • Remove the transmission dipstick, wipe it clean, and reinsert to check the fluid level.
  • If fluid is low, add the correct type of ATF (refer to owner’s manual).
  • If fluid is discolored or has a burnt smell, drain and replace it.
• Fluid Replacement:
  • Place a fluid catch pan under the transmission pan.
  • Remove the transmission pan bolts and carefully lower the pan to drain old fluid.
  • Remove the old filter and install a new filter.
  • Clean the pan and replace the gasket.
  • Reattach the pan and torque bolts to manufacturer specifications (usually around 10-12 ft-lbs).
  • Refill the transmission with the correct fluid using a funnel.

3. Inspect and Repair Wiring

• Visually inspect the wiring harness connected to the TCM for any damage, fraying, or corrosion.
• Use a multimeter to check for continuity in the wiring and ensure connections are secure.
• Repair or replace any damaged wiring or connectors.

4. Replace Transmission Control Module (if necessary)

• If diagnostics indicate a faulty TCM, proceed with replacement.
• Remove the Old TCM:
  • Disconnect the battery again for safety.
  • Locate the TCM (typically near the transmission or under the dashboard).
  • Remove the mounting screws and disconnect electrical connectors.
• Install New TCM:
  • Position the new TCM in place and reconnect the electrical connectors.
  • Secure it with the mounting screws.
  • Reconnect the battery.