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

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

619 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 (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.

Symptoms

•Transmission hesitates or delays when shifting gears
•Engine RPMs increase without corresponding vehicle speed
•Unusual noises during gear changes (grinding or whining)
•Check engine light may be illuminated
•Fluid leaks under the vehicle
•Burning smell from transmission fluid overheating

Diagnostic Steps

1
Scan the vehicle's OBD-II system for any stored error codes related to the transmission.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission fluid for any signs of contamination or metal shavings.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids for proper function using a multimeter.
6
Inspect the wiring and connectors related to the transmission for damage or corrosion.

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
•Multimeter
•Socket set
•Transmission funnel
•Drain pan

Parts Required

•Transmission fluid (as specified in owner's manual)
•Transmission filter (if applicable)
•Transmission solenoids (if tested and found faulty)

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for any stored error codes related to the transmission.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect the transmission fluid for any signs of contamination or metal shavings.
4
Examine the transmission filter for clogs or restrictions.
5
Test the transmission solenoids for proper function using a multimeter.
6
Inspect the wiring and connectors related to the transmission for damage or corrosion.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface, engage the parking brake, and wear safety gloves and goggles.

2. Check and Change Transmission Fluid

Tools Required: Transmission funnel, drain pan, socket set, new transmission fluid (check owner’s manual for specifications), new transmission filter (if applicable).
Steps:
1. Drain Old Fluid:
  - Place a drain pan underneath the transmission pan.
  - Remove the transmission pan bolts using the socket set and carefully lower the pan to drain fluid.
2. Inspect and Clean:
  - Remove the old filter and inspect for any debris.
  - Clean the transmission pan and magnet from metal particles.
3. Replace Filter:
  - Install the new transmission filter, ensuring it’s seated properly.
4. Reinstall Transmission Pan:
  - Apply a new gasket or sealant as required.
  - Reinstall the transmission pan and torque bolts to the manufacturer's specifications.
5. Add New Fluid:
  - Refill the transmission with the appropriate type and amount of new fluid using a funnel.

3. Inspect and Replace Transmission Solenoids (if necessary)

Tools Required: Socket set, multimeter, replacement solenoids.
Steps:
1. Disconnect the vehicle's battery to prevent electrical shorts.
2. Remove any components obstructing access to the transmission solenoids.
3. Unplug the electrical connectors from the solenoids.
4. Remove the solenoids and test them with a multimeter for resistance.
5. If defective, install new solenoids and reconnect the wiring.

4. Reconnect Battery and Test Drive

Reconnect the positive terminal of the battery.
Start the vehicle and check for leaks.
Test drive the vehicle to ensure smooth shifting and that the slipping issue has been resolved.