how to diagnose a failing transfer case in my Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

579 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 transfer case issues in Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Use caution when working under the vehicle; ensure it is securely supported

Symptoms

•Unusual noises (grinding, clunking) from the transfer case area
•Difficulty shifting between drive modes (e.g., 2WD to 4WD)
•Warning lights illuminated on the dashboard (e.g., AWD or 4WD warning)
•Vibration or shuddering during acceleration
•Slipping or loss of power to the wheels in 4WD mode
•Fluid leaks under the vehicle near the transfer case

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner
2
Inspect the transfer case fluid level and condition
3
Perform a visual inspection of the transfer case and related components for signs of damage, leaks, or loose connections
4
Test the transfer case shift motor using a multimeter to ensure it is receiving proper voltage and functioning correctly
5
Check the operation of switches and sensors related to the transfer case, including the mode selector switch
6
Conduct a road test to observe the behavior of the vehicle during different driving conditions (e.g., engaging 4WD)

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
•Socket set
•Torque wrench
•Multimeter
•Drain pan

Parts Required

•Transfer case fluid
•Transfer case shift motor (if needed)

Related Faults

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Symptoms

•Unusual noises (grinding, clunking) from the transfer case area

•Difficulty shifting between drive modes (e.g., 2WD to 4WD)

•Warning lights illuminated on the dashboard (e.g., AWD or 4WD warning)

•Vibration or shuddering during acceleration

•Slipping or loss of power to the wheels in 4WD mode

•Fluid leaks under the vehicle near the transfer case

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner
2
Inspect the transfer case fluid level and condition
3
Perform a visual inspection of the transfer case and related components for signs of damage, leaks, or loose connections
4
Test the transfer case shift motor using a multimeter to ensure it is receiving proper voltage and functioning correctly
5
Check the operation of switches and sensors related to the transfer case, including the mode selector switch
6
Conduct a road test to observe the behavior of the vehicle during different driving conditions (e.g., engaging 4WD)

Solution

1. Preparation

Gather necessary tools and parts.
Ensure vehicle is on a level surface and secure it with wheel chocks.
Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Transfer Case Fluid

Remove the transfer case drain plug using a socket wrench.
Allow the old fluid to drain completely into a drain pan.
Inspect the old fluid for metal shavings or discoloration.
Replace with manufacturer-recommended transfer case fluid.
Reinstall the drain plug and torque to manufacturer's specifications.

3. Remove and Inspect the Transfer Case

Remove any components obstructing access to the transfer case (e.g., exhaust, driveshaft).
Unbolt the transfer case from its mounting points using a socket set.
Carefully lower the transfer case and inspect for damage, wear, or signs of failure.
Check the input and output shafts for play or excessive wear.

4. Replace Transfer Case Shift Motor (if necessary)

Disconnect the wiring harness from the shift motor.
Remove the motor by unbolting it from the transfer case.
Install the new shift motor, ensuring it is properly aligned.
Reconnect the wiring harness securely.

5. Reassemble Components

Reattach the transfer case, ensuring all mounting bolts are torqued to specifications.
Reinstall any components removed for access.
Reconnect the negative battery terminal.