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

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

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

4 min read

635 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 symptoms, diagnostics, and repair instructions.

Affected Component

Transmission

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine and transmission to cool.

Symptoms

•Engine revs without corresponding acceleration
•Harsh or delayed shifting during gear changes
•Unusual noises (grinding or whining) when accelerating
•Warning light illuminated on the dashboard (transmission warning light)
•Fluid leaks under the vehicle
•Decreased fuel efficiency

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to the transmission.
2
Check the transmission fluid level and condition; inspect for burnt odor or metal particles.
3
Inspect the transmission fluid cooler lines for leaks or blockages.
4
Test the transmission solenoids using a multimeter to ensure they are functioning correctly.
5
Verify the condition of the transmission filter and check for any clogs.
6
Inspect the throttle position sensor (TPS) for proper operation, as it can affect 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
•Fluid pump
•Socket set
•Torque wrench
•Multimeter

Parts Required

•Automatic transmission fluid (Mercon LV)
•Transmission filter kit
•Gasket for transmission pan
•Transmission solenoids (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to the transmission.
2
Check the transmission fluid level and condition; inspect for burnt odor or metal particles.
3
Inspect the transmission fluid cooler lines for leaks or blockages.
4
Test the transmission solenoids using a multimeter to ensure they are functioning correctly.
5
Verify the condition of the transmission filter and check for any clogs.
6
Inspect the throttle position sensor (TPS) for proper operation, as it can affect shifting.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and safely lift the vehicle using a jack and jack stands.
Disconnect the battery to prevent electrical issues.

2. Check and Replace Transmission Fluid

Step 1: Locate the transmission dipstick tube. Remove the dipstick and wipe it clean.
Step 2: Insert the dipstick back and remove it again to check fluid level. If low, prepare to add fluid.
Step 3: If the fluid is dark or burnt, drain the transmission fluid using a fluid pump or by removing the pan.
Step 4: Replace the old fluid with new automatic transmission fluid (ATF) recommended by Ford (Mercon LV).
Tools Required: Fluid pump, funnel, transmission fluid.

3. Replace Transmission Filter

Step 1: Drain the transmission fluid by removing the pan bolts and carefully lowering the pan.
Step 2: Remove the old transmission filter by unbolting it from the valve body.
Step 3: Clean the transmission pan and replace the pan gasket.
Step 4: Install the new filter and reattach the pan, tightening bolts to manufacturer specification (typically 7-9 ft-lbs).
Tools Required: Socket set, torque wrench, new filter kit, new gasket.

4. Inspect and Replace Transmission Solenoids (if necessary)

Step 1: Locate the transmission solenoid assembly (usually found on the valve body).
Step 2: Disconnect the electrical connectors and remove the solenoid retaining bolts.
Step 3: Replace any faulty solenoids with new ones, ensuring they are properly seated.
Tools Required: Socket set, small screwdriver.

5. Test Drive

Step 1: Reconnect the battery and ensure all tools are removed from the engine bay.
Step 2: Start the vehicle and allow it to reach operating temperature.
Step 3: Conduct a test drive to monitor for slipping and confirm repair effectiveness.