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

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

577 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 issues in the 2015-2020 Ford F-150. 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 components.
•Allow the vehicle to cool before draining the transmission fluid.

Symptoms

•Transmission hesitates or slips during acceleration
•Unusual engine revving without corresponding vehicle speed increase
•Harsh or erratic shifting between gears
•Check engine light illuminated
•Fluid leakage under the vehicle
•Burning smell from the transmission area

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for any transmission-related error codes.
2
Inspect the transmission fluid level and condition; look for burnt smell or discoloration.
3
Visually inspect the transmission for external leaks and check all connectors.
4
Check the transmission filter and fluid for contamination or debris.
5
Test the transmission solenoid with a multimeter to ensure proper function.
6
Road test the vehicle to replicate the slipping condition and note specific scenarios.

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
•Floor jack
•Jack stands
•Transmission fluid
•Fluid pump
•Multimeter

Parts Required

•Transmission filter
•Transmission fluid
•Pan gasket
•Transmission solenoid (if applicable)

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for any transmission-related error codes.
2
Inspect the transmission fluid level and condition; look for burnt smell or discoloration.
3
Visually inspect the transmission for external leaks and check all connectors.
4
Check the transmission filter and fluid for contamination or debris.
5
Test the transmission solenoid with a multimeter to ensure proper function.
6
Road test the vehicle to replicate the slipping condition and note specific scenarios.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, floor jack, jack stands, transmission fluid, fluid pump, multimeter.
Safety Warnings: Disconnect the battery before working on electrical components. Allow the vehicle to cool before draining the transmission fluid.

2. Fluid Change

Raise the vehicle using a floor jack and secure it with jack stands.
Remove the transmission drain plug to drain old fluid into a suitable container.
Replace the drain plug and torque it to manufacturer specifications (refer to service manual for exact torque value).
Remove the transmission fluid pan by unscrewing the bolts and gently prying it off, being careful not to damage the gasket.
Inspect and replace the transmission filter, ensuring proper orientation.
Clean the transmission pan and replace the gasket with a new one.
Reinstall the transmission pan and torque the bolts in a crisscross pattern to the specified value.

3. Solenoid Replacement (if faulty)

Identify and access the transmission solenoid assembly; this may require removing additional components.
Disconnect the electrical connector and remove the mounting bolts for the solenoid.
Replace the faulty solenoid with a new part and reassemble by reversing the removal steps.

4. Fluid Replacement

Using a fluid pump, refill the transmission with new fluid appropriate for the Ford F-150 (typically Mercon LV).
Start the engine and cycle through the gears to circulate the fluid.
Check the fluid level using the dipstick and add more fluid as necessary.

5. Final Inspection

Check for leaks around the fluid pan and solenoid area.
Reconnect the battery and clear any diagnostic codes using the OBD-II scanner.