how to fix P0731 code in my Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0731 transmission incorrect gear ratio in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials needed for the repair.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

• Tools Required: Socket set, funnel, transmission fluid pump
• Sub-steps:
  1. Locate the transmission fluid dipstick and remove it.
  2. Check the fluid level; if low, add the manufacturer-recommended transmission fluid.
  3. If the fluid is dirty or burnt, drain the transmission fluid using a transmission pump.
  4. Replace the old fluid with new fluid, ensuring to fill per manufacturer specifications.
  5. Recheck the fluid level after running the vehicle for a few minutes.

3. Inspect and Repair Wiring

• Tools Required: Multimeter, electrical tape
• Sub-steps:
  1. Visually inspect the transmission wiring harness for frays, corrosion, or loose connectors.
  2. Use a multimeter to test the continuity of the wires leading to the transmission.
  3. Repair or replace any damaged wiring or connectors.
  4. Ensure all connections are secure before reconnecting the battery.

4. Replace Vehicle Speed Sensor (if faulty)

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Locate the vehicle speed sensor on the transmission.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor using a socket set and replace it with a new one.
  4. Reconnect the connector and ensure it clicks into place securely.
  5. Torque the sensor to manufacturer specifications.

5. Reset Transmission Control Module

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery after repairs are completed.
  2. Use an OBD-II scanner to clear the P0731 code and any related codes from the TCM.
  3. Perform a road test to ensure the issue has been resolved.