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

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 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 battery before working on electrical systems.
•Allow engine to cool before opening the transmission or working on fluid systems.

Symptoms

•Slipping sensation during acceleration
•Delayed or harsh shifting between gears
•Engine revs without corresponding vehicle speed increase
•Check engine light illuminated
•Fluid leaks under the vehicle
•Unusual noises (grinding or whining) from the transmission area

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; look for burnt smell or dark color.
3
Check for any visible fluid leaks around the transmission pan and seals.
4
Test the transmission control module (TCM) for proper function and programming.
5
Inspect the transmission filter for clogs or blockages.
6
Verify the operation of the throttle position sensor (TPS) and its effect on transmission shifting.

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
•Funnel
•Transmission fluid pump

Parts Required

•Transmission fluid (Ford Mercon LV)
•Transmission filter
•Transmission pan gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; look for burnt smell or dark color.
3
Check for any visible fluid leaks around the transmission pan and seals.
4
Test the transmission control module (TCM) for proper function and programming.
5
Inspect the transmission filter for clogs or blockages.
6
Verify the operation of the throttle position sensor (TPS) and its effect on transmission shifting.

Solution

1. Preparation

Gather tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick and wipe it clean.
2. Insert the dipstick back in and remove it to check the fluid level.
3. If low, add the recommended transmission fluid (Ford Mercon LV).
4. If fluid is dark or smells burnt, drain the old fluid from the transmission pan.
5. Replace the transmission fluid with fresh fluid until the correct level is reached.
Tools Required: Socket set, transmission fluid pump, funnel.
Safety Warnings: Ensure the vehicle is cool before working on the transmission system.

3. Replace Transmission Filter

Sub-steps:
1. Remove the transmission pan bolts and carefully lower the pan.
2. Remove the old transmission filter and replace it with a new one.
3. Clean the transmission pan and replace the gasket.
4. Reinstall the transmission pan and torque the bolts to manufacturer specifications (usually around 10-12 ft-lbs).
Tools Required: Socket set, gasket scraper, torque wrench.
Safety Warnings: Use caution with sharp edges on the transmission pan.

4. Reprogram the Transmission Control Module (TCM)

Sub-steps:
1. Reconnect the battery and start the vehicle.
2. Using a compatible scan tool, access the TCM settings.
3. Follow the prompts to reprogram or reset the TCM.
4. Test drive the vehicle to ensure improved shifting performance.
Tools Required: OBD-II scanner with TCM programming capability.
Safety Warnings: Ensure the vehicle is in a safe area for testing.