why does my Ford F-150 13th Generation (2015-2020) transmission slip when accelerating

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

507 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 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 systems.
•Allow the vehicle to cool before working on the transmission.

Symptoms

•Transmission slips during acceleration
•Delayed engagement when shifting from park to drive
•Unusual engine RPM fluctuations
•Check engine light illuminated
•Fluid leaks under the vehicle
•Burning smell from the transmission area

Diagnostic Steps

1
Scan the vehicle’s OBD-II system for error codes using a scanner.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission for any visible leaks or damage.
4
Test the transmission fluid pressure using a pressure gauge.
5
Check the condition and operation of the transmission filter.
6
Inspect the wiring and connectors related to the transmission control module (TCM).

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
•Transmission fluid pressure gauge
•Screwdrivers
•Drain pan

Parts Required

•Transmission fluid (Mercon LV)
•Transmission filter
•Gasket for transmission pan

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle’s OBD-II system for error codes using a scanner.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission for any visible leaks or damage.
4
Test the transmission fluid pressure using a pressure gauge.
5
Check the condition and operation of the transmission filter.
6
Inspect the wiring and connectors related to the transmission control module (TCM).

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Fluid Inspection and Replacement

Check Fluid Level:
- Remove the transmission dipstick and wipe it clean.
- Reinsert the dipstick and remove it again to check fluid level.
Change Fluid:
- Drain the old transmission fluid from the pan by removing the drain plug or pan bolts.
- Replace with new transmission fluid as per manufacturer specifications (typically Mercon LV for Ford).
- Torque the pan bolts to the manufacturer’s specified value (usually around 10-12 ft-lbs).

3. Filter Replacement

Remove Transmission Pan:
- Remove the bolts securing the transmission pan.
- Carefully lower the pan and remove the old filter.
Install New Filter:
- Install a new transmission filter and secure it.
- Clean the mating surfaces and reinstall the pan with a new gasket.

4. Electrical Inspection

Inspect Wiring:
- Check for frayed wires or poor connections in the TCM circuit.
- Repair or replace any damaged wiring as necessary.
Test TCM:
- Reconnect the battery and use a scanner to clear any codes.
- Test the TCM operation while driving to ensure proper shifting.