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

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, transmission fluid, and a funnels.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Check and Replace Transmission Fluid

• Sub-step 1: Remove the transmission fluid dipstick and check fluid level. If low, proceed to add fluid.
• Sub-step 2: If fluid is dirty, remove the transmission drain plug and drain old fluid into a clean container.
• Sub-step 3: Replace with the manufacturer-recommended transmission fluid (e.g., Toyota ATF WS) using a funnel, ensuring the fluid level is correct according to the dipstick.

3. Inspect and Repair Wiring

• Sub-step 1: Disconnect the battery to prevent any electrical shorts.
• Sub-step 2: Remove the cover for the transmission control module.
• Sub-step 3: Inspect all wiring and connectors for signs of wear, corrosion, or loose connections; repair or replace as necessary.
• Sub-step 4: Reconnect the battery.

4. Test the Transmission Control Module (TCM)

• Sub-step 1: Using a multimeter, check the voltage at the TCM connector while the ignition is in the "ON" position.
• Sub-step 2: If voltage is absent, trace the circuit back to the fuse box to identify any blown fuses or broken wires.
• Sub-step 3: If the TCM is faulty, replace it with a new unit.

5. Reassemble and Final Check

• Sub-step 1: Reattach any components that were removed during the inspection and repair process.
• Sub-step 2: Ensure all bolts are tightened to manufacturer specifications (if provided in the service manual).
• Sub-step 3: Clear the error codes again and perform a test drive to ensure the issue is resolved.