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

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

653 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 diagnostic steps and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
•Disconnect the battery to prevent electrical shorts.

Symptoms

•Transmission slips or delays in engagement during acceleration
•Engine RPM increases without corresponding vehicle speed increase
•Harsh or rough shifting between gears
•Check engine light illuminated
•Transmission fluid may have a burnt smell or dark color
•Unusual noises from the transmission area, such as whining or grinding

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to identify any transmission-related issues.
2
Check the transmission fluid level and condition; ensure it is at the correct level and is not burnt or contaminated.
3
Inspect the transmission fluid filter for blockages or excessive debris.
4
Examine the transmission mounts for signs of wear or damage that may affect alignment.
5
Test the throttle position sensor (TPS) for proper operation and responsiveness.
6
Inspect wiring and connectors related to the transmission control module (TCM) for any signs of corrosion 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

•OBD-II scanner
•Transmission fluid pump
•10mm socket
•Drain pan
•Funnel
•Torque wrench
•Gasket scraper
•Jack and jack stands
•18mm socket
•21mm socket
•Multimeter
•Screwdriver set

Parts Required

•Transmission filter
•Transmission fluid

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Symptoms

•Transmission slips or delays in engagement during acceleration

•Engine RPM increases without corresponding vehicle speed increase

•Harsh or rough shifting between gears

•Check engine light illuminated

•Transmission fluid may have a burnt smell or dark color

•Unusual noises from the transmission area, such as whining or grinding

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to identify any transmission-related issues.
2
Check the transmission fluid level and condition; ensure it is at the correct level and is not burnt or contaminated.
3
Inspect the transmission fluid filter for blockages or excessive debris.
4
Examine the transmission mounts for signs of wear or damage that may affect alignment.
5
Test the throttle position sensor (TPS) for proper operation and responsiveness.
6
Inspect wiring and connectors related to the transmission control module (TCM) for any signs of corrosion or damage.

Solution

1. Preparation

Gather tools and parts required for the repair.
Safety precautions: Ensure the vehicle is parked on a flat surface, and the parking brake is engaged. Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and remove it to check the fluid level.
2. If fluid is low, add the manufacturer-recommended transmission fluid (check owner’s manual for specifications).
3. If fluid appears burnt or contaminated, proceed with a fluid change.
Tools Required:
- Transmission fluid pump
- 10mm socket
- Drain pan
- Funnel

3. Replace Transmission Filter

Sub-steps:
1. Remove the transmission pan bolts using the 10mm socket and carefully lower the pan.
2. Remove the old filter and install the new filter, ensuring it is seated properly.
3. Clean the pan and replace the gasket if necessary.
4. Reinstall the transmission pan and torque bolts to manufacturer specifications.
Tools Required:
- Torque wrench
- Gasket scraper

4. Inspect and Replace Transmission Mounts

Sub-steps:
1. Support the transmission with a jack to relieve load on the mounts.
2. Remove the bolts securing the transmission mounts and inspect for signs of damage or wear.
3. Replace any damaged mounts with OEM replacements and torque bolts to specifications.
Tools Required:
- Jack and jack stands
- 18mm and 21mm sockets

5. Test and Replace Throttle Position Sensor (if necessary)

Sub-steps:
1. Disconnect the TPS connector and remove the sensor from the throttle body.
2. Test the sensor with a multimeter to check for proper voltage output.
3. If faulty, install a new TPS and reconnect the electrical connector.
Tools Required:
- Multimeter
- Screwdriver set