my Ford F-150 Fourteenth Generation (2021-present) won't go into 4WD what should I check

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery (negative terminal) to ensure safety during the repair.

2. Inspect and Replace 4WD Switch

• Sub-steps:
  1. Remove the panel surrounding the 4WD switch using a trim removal tool.
  2. Disconnect the wiring harness from the back of the switch.
  3. Test the switch with a multimeter to check for continuity.
  4. If faulty, replace the switch with a new one and reconnect the wiring harness.
  5. Reinstall the panel.

3. Check Transfer Case Fluid

• Sub-steps:
  1. Locate the transfer case fill plug, typically on the side of the transfer case.
  2. Remove the fill plug and use a fluid level gauge to check the fluid level.
  3. If low, add the manufacturer-recommended transfer case fluid until it reaches the fill level.
  4. Replace and securely tighten the fill plug.

4. Test Transfer Case Motor

• Sub-steps:
  1. Locate the transfer case motor.
  2. Disconnect the wiring harness from the motor.
  3. Use jumper wires to apply battery voltage directly to the motor terminals.
  4. Observe if the motor engages and moves the transfer case.
  5. If the motor does not operate, replace it with a new unit.