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

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

601 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 troubleshoot and fix transmission slipping in Ford F-150 (2015-2020). 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 engine to cool before performing any work on the transmission.

Symptoms

•Engine RPM increases without corresponding vehicle speed increase
•Harsh or delayed shifting between gears
•Transmission warning light illuminated
•Unusual noises (grinding or whining) from the transmission
•Fluid leaks underneath the vehicle
•Poor acceleration or loss of power while driving

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect transmission fluid level and condition; look for signs of contamination or burning.
3
Check for any visible fluid leaks around the transmission and related components.
4
Inspect the transmission filter for blockage or damage, if equipped.
5
Test the transmission fluid pressure using a pressure gauge to determine if the pump is functioning properly.
6
Verify the operation of the throttle position sensor and vehicle speed sensor as they affect transmission performance.

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
•Transmission fluid pump
•Drain pan
•Funnel
•Socket set
•Gasket scraper
•Multimeter

Parts Required

•Transmission fluid (Ford Mercon LV)
•Transmission filter and gasket
•Throttle position sensor (if faulty)
•Vehicle speed sensor (if faulty)

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Symptoms

•Engine RPM increases without corresponding vehicle speed increase

•Harsh or delayed shifting between gears

•Transmission warning light illuminated

•Unusual noises (grinding or whining) from the transmission

•Fluid leaks underneath the vehicle

•Poor acceleration or loss of power while driving

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect transmission fluid level and condition; look for signs of contamination or burning.
3
Check for any visible fluid leaks around the transmission and related components.
4
Inspect the transmission filter for blockage or damage, if equipped.
5
Test the transmission fluid pressure using a pressure gauge to determine if the pump is functioning properly.
6
Verify the operation of the throttle position sensor and vehicle speed sensor as they affect transmission performance.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Allow the engine to cool before performing any work on the transmission.

2. Check and Replace Transmission Fluid

Sub-steps:
- Remove the transmission dipstick and check the fluid level and condition.
- If the fluid is low, add the recommended type of transmission fluid (Ford Mercon LV).
- If the fluid is dirty or burnt, proceed to drain the transmission fluid.
Tools Required:
- Transmission fluid pump
- Drain pan
- Funnel

3. Replace Transmission Filter

Sub-steps:
- Remove the transmission pan using a socket set, and allow any remaining fluid to drain.
- Remove the old filter and replace it with a new filter.
- Clean the transmission pan and replace the gasket before reinstallation.
Tools Required:
- Socket set
- Gasket scraper
- New transmission filter and gasket

4. Inspect and Repair or Replace Components

Sub-steps:
- Check the throttle position sensor and vehicle speed sensor for proper operation; replace if faulty.
- Inspect the transmission pump for any signs of failure and replace if necessary.
- If applicable, check for any issues with the valve body or solenoids, and replace as needed.
Tools Required:
- Multimeter (for sensor testing)
- Socket set

5. Refill Transmission Fluid

Sub-steps:
- Use a funnel to refill the transmission with the appropriate type and amount of fluid.
- Start the engine and allow it to reach operating temperature, then check the fluid level again and add more fluid if necessary.
Tools Required:
- Funnel
- Transmission fluid (Ford Mercon LV)