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

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

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

569 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

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical systems
•Allow the engine to cool before working on the transmission

Symptoms

•Transmission slips during acceleration
•Delayed or harsh shifting
•Engine revs without corresponding vehicle speed increase
•Unusual noises while shifting (grinding or whining)
•Check engine light illuminated
•Poor fuel economy

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to check for diagnostic trouble codes (DTCs)
2
Inspect the transmission fluid level and condition (check for discoloration or burnt smell)
3
Examine the transmission filter for blockages or contamination
4
Inspect the transmission control module (TCM) for faults or software updates
5
Check for any external leaks around the transmission seal and pan
6
Test the transmission solenoids for proper operation using a multimeter

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
•Multimeter
•Transmission fluid pump
•Wire brush

Parts Required

•Transmission fluid (manufacturer-recommended)
•Transmission filter
•Gasket for transmission pan
•Transmission pan bolts (if necessary)

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to check for diagnostic trouble codes (DTCs)
2
Inspect the transmission fluid level and condition (check for discoloration or burnt smell)
3
Examine the transmission filter for blockages or contamination
4
Inspect the transmission control module (TCM) for faults or software updates
5
Check for any external leaks around the transmission seal and pan
6
Test the transmission solenoids for proper operation using a multimeter

Solution

1. Preparation

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

2. Check and Replace Transmission Fluid

Tools Required: Socket set, funnel, transmission fluid pump.
Sub-steps:
1. Remove the transmission fill plug and dipstick to check fluid level.
2. If low, drain the old fluid using a transmission fluid pump.
3. Replace with manufacturer-recommended transmission fluid (consult owner's manual).
4. Reinsert the fill plug and dipstick.

3. Replace Transmission Filter

Tools Required: Socket set, torque wrench, gasket scraper.
Sub-steps:
1. Remove the transmission pan by unscrewing the bolts (consult torque specs in the manual).
2. Carefully scrape off the old gasket material from the pan and transmission case.
3. Remove the old filter and install the new filter, ensuring it is seated properly.
4. Reinstall the transmission pan with a new gasket, tightening to specified torque.

4. Inspect and Repair Electrical Connections

Tools Required: Multimeter, wire brush.
Sub-steps:
1. Inspect the wiring harnesses connected to the TCM and transmission solenoids for corrosion or damage.
2. Clean any corroded connections using a wire brush.
3. Repair or replace damaged wires as necessary.

5. Reprogram or Replace TCM (if necessary)

Tools Required: OBD-II scanner with programming capability.
Sub-steps:
1. Use the OBD-II scanner to check for software updates for the TCM.
2. Follow the manufacturer's instructions to reprogram the TCM if updates are available.
3. If the TCM is faulty, replace it following the manufacturer's guidelines.