how to fix a Ford Explorer Sixth Generation (2020-present) that won't go into 4WD

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

568 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix 4WD issues in the 2020 Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before performing electrical repairs.
•Allow the vehicle to cool before working on the transfer case to avoid burns.

Symptoms

•4WD indicator light not illuminating
•Inability to switch between 2WD and 4WD modes
•Transmission slipping or harsh shifting
•Unusual noises when attempting to engage 4WD
•Check engine light illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to the 4WD system.
2
Inspect the 4WD switch for physical damage or signs of wear.
3
Check the 4WD control module and wiring harness for any loose connections or damage.
4
Verify the condition and level of the transfer case fluid.
5
Test the transfer case motor operation using a multimeter.
6
Inspect the front and rear differential for any mechanical issues or damage.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Screwdriver set
•Multimeter
•Wire stripper/crimper
•Socket set
•Fluid pump

Parts Required

•4WD switch (if faulty)
•Transfer case motor (if faulty)
•Transfer case fluid

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to the 4WD system.
2
Inspect the 4WD switch for physical damage or signs of wear.
3
Check the 4WD control module and wiring harness for any loose connections or damage.
4
Verify the condition and level of the transfer case fluid.
5
Test the transfer case motor operation using a multimeter.
6
Inspect the front and rear differential for any mechanical issues or damage.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface.
Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace 4WD Switch

Tools Required: Screwdriver set, multimeter
Locate the 4WD control switch on the center console.
Remove the screws securing the switch and gently pull it out.
Use a multimeter to test for continuity. If faulty, replace with a new switch.
Reinstall the switch and reconnect the battery.

3. Check and Repair Wiring

Tools Required: Wire stripper/crimper, electrical tape
Inspect the wiring harness connected to the 4WD control module for any frayed or damaged wires.
Repair any damaged wiring using solder or crimp connectors and cover with electrical tape.
Ensure all connections are secure before proceeding.

4. Test Transfer Case Motor

Tools Required: Multimeter
Locate the transfer case motor, which is typically mounted on the transfer case.
Disconnect the electrical connector from the motor.
Use the multimeter to check for voltage when the switch is activated. If no voltage is present, further diagnose wiring or control module issues.
If voltage is present but the motor does not engage, replace the transfer case motor.

5. Fluid Inspection and Change

Tools Required: Socket set, fluid pump, transfer case fluid
Remove the drain plug from the transfer case and inspect the fluid for metal shavings or debris.
If contaminated, drain the old fluid completely.
Use a fluid pump to fill the transfer case with the manufacturer-recommended fluid until it reaches the fill level.
Reinstall the drain plug securely.