how to fix P0700 code in Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather tools and safety gear: gloves, safety glasses, OBD-II scanner, multimeter, socket set, and torque wrench.

2. Transmission Fluid Inspection

• Step 1: Locate the transmission dipstick (if applicable) or the fill plug.
• Step 2: Check the fluid level using the dipstick; add fluid if necessary.
• Step 3: Inspect the transmission fluid for discoloration or burnt smell; if the fluid is dirty, proceed to change it.

3. Wiring and Connector Inspection

• Step 1: Disconnect the battery to ensure safety.
• Step 2: Remove the connector to the TCM by pressing the release tab and gently pulling it apart.
• Step 3: Inspect the pins and sockets for corrosion or damage. Clean or repair as necessary.
• Step 4: Reconnect the TCM connector and battery.

4. TCM Testing

• Step 1: Reconnect the battery and use a multimeter to check for voltage at the TCM connectors according to the service manual specifications.
• Step 2: If the voltage is outside of specified ranges, replace the TCM.

5. Transmission Fluid Change (if needed)

• Step 1: Raise the vehicle and secure it with jack stands.
• Step 2: Remove the transmission pan bolts and carefully lower the pan.
• Step 3: Drain the old fluid and inspect the pan for metal shavings or debris.
• Step 4: Replace the transmission filter if applicable.
• Step 5: Reinstall the pan with a new gasket and torque the bolts to the manufacturer's specifications.
• Step 6: Refill the transmission with the appropriate fluid type, checking the level as you go.