why is my Ford F-150 13th Generation (2015-2020) check engine light on with code P0700

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely supported with jack stands.

2. Check Transmission Fluid

• Remove the transmission dipstick and wipe it clean.
• Reinsert the dipstick and remove it again to check the fluid level.
• If the fluid is low, add the manufacturer's recommended transmission fluid (e.g., Mercon LV for Ford vehicles).
• If the fluid is dark or smells burnt, a transmission fluid change may be necessary.

3. Inspect Wiring and Connections

• Visually inspect the transmission wiring harness for fraying, corrosion, or loose connections.
• Reconnect any loose connectors and repair any damaged wiring using electrical tape or heat shrink tubing.

4. Test Transmission Control Module (TCM)

• Using a diagnostic scanner, access the TCM data and check for any faults.
• If the TCM is unresponsive or showing errors, it may need to be replaced.
• If replacement is necessary, follow the next steps.

5. Replace Transmission Control Module (if needed)

• Remove any components obstructing access to the TCM.
• Disconnect the wiring harness from the TCM.
• Unbolt the TCM from its mounting location using the appropriate socket.
• Install the new TCM by reversing the removal steps and ensuring all connections are secure.

6. Reconnect Battery and Test Drive

• Reconnect the negative battery terminal.
• Start the engine and allow it to warm up.
• Test drive the vehicle to ensure proper shifting and that the check engine light does not reappear.