my Ford F-150 13th Generation (2015-2020) makes a whining noise when in 4WD what to check

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

546 words

Problem Statement

Learn how to diagnose and fix whining noise in 4WD for Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Drivetrain

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool down before working on hot components.

Symptoms

•Whining noise while in 4WD
•Noise increases with vehicle speed
•Difficulty engaging or disengaging 4WD
•Vibration felt through the drivetrain
•Possible grinding noise when turning

Diagnostic Steps

1
Inspect the transfer case fluid level and condition.
2
Check for any visible leaks around the transfer case and differentials.
3
Listen for the noise while stationary and in gear to determine if it is drivetrain-related.
4
Check the front and rear differential fluid levels and condition.
5
Test the operation of the 4WD system using the switch and observe any error messages on the dashboard.
6
Inspect the driveshafts and U-joints for wear 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

•Socket set
•Fluid pump
•Drain pan
•Wrench set
•Pry bar

Parts Required

•Transfer case fluid
•Differential fluid
•U-joints (if defective)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the transfer case fluid level and condition.
2
Check for any visible leaks around the transfer case and differentials.
3
Listen for the noise while stationary and in gear to determine if it is drivetrain-related.
4
Check the front and rear differential fluid levels and condition.
5
Test the operation of the 4WD system using the switch and observe any error messages on the dashboard.
6
Inspect the driveshafts and U-joints for wear or damage.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and engage the parking brake.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transfer Case Fluid

Tools Required: Socket set, fluid pump, drain pan
Remove the drain plug from the transfer case and allow old fluid to drain completely.
Inspect fluid for metal shavings or contaminants. If present, this indicates possible internal damage.
Replace with manufacturer-specified transfer case fluid (check the owner’s manual for specifications).
Reinstall the drain plug and torque to manufacturer specifications.

3. Inspect and Replace Differential Fluids

Tools Required: Socket set, fluid pump, drain pan
Remove the fill plug from both front and rear differentials.
Check fluid level and condition; if it’s low or contaminated, drain and replace with the appropriate differential fluid.
Reinstall fill plugs, ensuring a proper seal.

4. Inspect Driveshaft and U-Joints

Tools Required: Wrench set, pry bar
Inspect the driveshafts for any visible damage or excessive play.
Check U-joints for smooth operation; replace any that show signs of wear or binding.
Reinstall driveshafts, ensuring all bolts are torqued to specifications.

5. Test the 4WD System

Reconnect the battery.
Start the vehicle and engage the 4WD system.
Drive the vehicle at low speed to verify if the whining noise persists.