how to diagnose Ford F-150 13th Generation (2015-2020) transmission problems

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

581 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 problems in Ford F-150 13th Generation (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 engine to cool before opening the transmission fluid pan.

Symptoms

•Rough or erratic shifting between gears
•Transmission slipping or failing to engage
•Unusual noises (grinding, whining, or clunking) during operation
•Warning lights illuminated on the dashboard (e.g., transmission warning light)
•Delayed engagement when shifting from park to drive/reverse
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner for any error codes related to the transmission.
2
Check the transmission fluid level and condition; look for burnt smell or metal shavings.
3
Inspect the transmission wiring harness and connectors for any signs of wear or damage.
4
Perform a road test to assess shifting behavior and identify any specific conditions that exacerbate the problem.
5
Check for any TSBs (Technical Service Bulletins) related to transmission issues for this model year.
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
•Drain pan
•Funnel

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Rough or erratic shifting between gears

•Transmission slipping or failing to engage

•Unusual noises (grinding, whining, or clunking) during operation

•Warning lights illuminated on the dashboard (e.g., transmission warning light)

•Delayed engagement when shifting from park to drive/reverse

•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner for any error codes related to the transmission.
2
Check the transmission fluid level and condition; look for burnt smell or metal shavings.
3
Inspect the transmission wiring harness and connectors for any signs of wear or damage.
4
Perform a road test to assess shifting behavior and identify any specific conditions that exacerbate the problem.
5
Check for any TSBs (Technical Service Bulletins) related to transmission issues for this model year.
6
Test the transmission solenoids for proper operation using a multimeter.

Solution

1. Preparation

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

2. Fluid Change

Sub-steps:
1. Remove the transmission fluid pan by loosening the bolts with a socket set.
2. Allow the old fluid to drain completely into a drain pan.
3. Replace the transmission filter if applicable, ensuring the new filter is seated properly.
4. Clean the pan and inspect for metal debris; replace if excessively worn.
5. Reinstall the pan with a new gasket, tightening bolts to the manufacturer's torque specifications (typically 12-15 ft-lbs).

3. Solenoid Replacement (if faulty)

Sub-steps:
1. Locate and remove the transmission solenoid assembly following the service manual.
2. Disconnect the electrical connector and unbolt the solenoid from the transmission.
3. Install the new solenoid, ensuring it is properly aligned and secured.
4. Reconnect the electrical connector.

4. Wiring Inspection and Repair

Sub-steps:
1. Visually inspect the wiring harness connected to the transmission for frays or breaks.
2. Repair any damaged wires using heat-shrink connectors and electrical tape as needed.
3. Ensure all connections are secure and free from corrosion.

5. Refill Transmission Fluid

Sub-steps:
1. Use a funnel to refill the transmission with the recommended type and amount of fluid (typically Mercon LV for Ford).
2. Start the engine and let it idle; cycle through the gears to circulate the fluid.
3. Check the fluid level with the dipstick, adding fluid as necessary.