why is my Ford F-150 13th Generation (2015-2020) transmission slipping when I accelerate

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

523 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 diagnostic procedures 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 fluid or working on the transmission.

Symptoms

•Slipping sensation during acceleration
•Engine RPM increases without a corresponding increase in speed
•Delay in engagement when shifting from park to drive or reverse
•Check engine light illuminated
•Unusual noises (grinding, whining) during gear changes
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition; low or burnt fluid may indicate a problem.
3
Inspect the transmission for visible leaks, particularly around seals and gaskets.
4
Check the transmission filter for clogs or contamination.
5
Test the transmission control module (TCM) for proper function.
6
Examine the throttle position sensor (TPS) for proper operation, as it can impact 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
•Transmission fluid pump
•Socket set
•Torque wrench
•Fluid catch pan
•Screwdriver set

Parts Required

•Transmission fluid (Mercon LV)
•Transmission filter
•Throttle position sensor (if needed)
•Transmission control module (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition; low or burnt fluid may indicate a problem.
3
Inspect the transmission for visible leaks, particularly around seals and gaskets.
4
Check the transmission filter for clogs or contamination.
5
Test the transmission control module (TCM) for proper function.
6
Examine the throttle position sensor (TPS) for proper operation, as it can impact transmission shifting.

Solution

1. Preparation

Gather necessary tools and parts listed below.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to ensure safety during repairs.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick and check fluid level; add fluid if low.
2. If the fluid is burnt or contaminated, drain the old fluid from the transmission pan.
3. Replace the transmission fluid with manufacturer-recommended type (e.g., Mercon LV).
4. Replace the transmission filter if clogged.
Tools Required:
- Transmission fluid pump
- Socket set
- Fluid catch pan

3. Repair or Replace the Transmission Control Module (if faulty)

Sub-steps:
1. Locate the TCM, typically found near the transmission or under the dashboard.
2. Disconnect the wiring harness from the TCM.
3. Remove the TCM using the appropriate socket size.
4. Install the new or repaired TCM and reconnect the wiring harness.
Tools Required:
- Socket set
- Torque wrench

4. Inspect and Replace the Throttle Position Sensor (if necessary)

Sub-steps:
1. Locate the TPS on the throttle body.
2. Disconnect the electrical connector.
3. Remove the TPS using the appropriate tool.
4. Install the new TPS and reconnect the connector.
Tools Required:
- Socket set
- Screwdriver set