how to fix Ford F-150 13th Generation (2015-2020) transmission slipping when shifting

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

552 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 transmission slipping in Ford F-150 13th Generation (2015-2020). Step-by-step guide with symptoms, diagnostics, 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.
•Allow the engine to cool before opening the transmission pan.

Symptoms

•Transmission slips during gear changes
•Engine RPMs increase without corresponding vehicle speed increase
•Harsh or delayed shifting
•Check engine light illuminated
•Fluid leaks under the vehicle
•Unusual noises (grinding or whining) during shifting

Diagnostic Steps

1
Scan the vehicle's onboard computer for any stored error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for burnt smell or dark coloration.
3
Inspect the transmission fluid lines for leaks or damage.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids for proper operation.
6
Verify the condition of the transmission control module (TCM) and connections.

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
•Funnel

Parts Required

•Transmission fluid (Mercon LV)
•Transmission filter
•Transmission solenoids (if needed)

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Diagnostic Steps

1
Scan the vehicle's onboard computer for any stored error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition; look for burnt smell or dark coloration.
3
Inspect the transmission fluid lines for leaks or damage.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids for proper operation.
6
Verify the condition of the transmission control module (TCM) and connections.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface, engage the parking brake, and disconnect the battery.
Wear safety gloves and goggles.

2. Check and Replace Transmission Fluid

Inspect Fluid:
- Remove the transmission dipstick and check fluid levels and condition.
Fluid Change:
- Place a drain pan under the transmission pan and remove the pan bolts using a socket set.
- Carefully lower the pan and allow the old fluid to drain completely.
- Replace the transmission filter.
Refill Fluid:
- Reinstall the transmission pan and tighten bolts to the manufacturer's torque specifications (typically 10-12 ft-lbs).
- Using a funnel, refill the transmission with new fluid (consult the owner's manual for the correct type, usually Mercon LV).

3. Inspect and Replace Transmission Filter

Remove Transmission Pan:
- Follow the steps in "Check and Replace Transmission Fluid" to access the filter.
Replace Filter:
- Unscrew and remove the old filter.
- Install the new filter in the same position, ensuring it is seated correctly.

4. Test and Replace Transmission Solenoids (if necessary)

Access Solenoids:
- Remove the valve body cover if necessary to access solenoids.
Test Solenoids:
- Use a multimeter to check resistance; compare to specifications (typically 20-30 ohms).
Replace Faulty Solenoids:
- Remove and replace any solenoids that do not meet specifications.

5. Reconnect Battery and Test Drive

Reconnect the battery and start the engine.
Allow the vehicle to reach operating temperature and perform a test drive to ensure proper operation.