how to fix Ford F-150 13th Generation (2015-2020) that won't shift into gear

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

563 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 issues in Ford F-150 (2015-2020) that won't shift into gear. 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 components to prevent shock or short circuits.
•Allow the vehicle to cool before inspecting the transmission to avoid burns.

Symptoms

•Engine revs without the vehicle moving
•Warning lights illuminated on the dashboard (e.g., transmission light)
•Difficulty engaging any gear
•Grinding noise when attempting to shift
•Transmission fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; low or contaminated fluid can affect shifting.
3
Check the gear linkage and shifter assembly for proper adjustment and any visible damage.
4
Inspect the transmission fluid lines and cooler for leaks and blockages.
5
Test the brake light switch operation; a faulty switch can prevent the vehicle from shifting.
6
Confirm that the battery is fully charged; low voltage can affect electronic transmission controls.

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
•Transmission fluid (as specified in the owner’s manual)
•Socket set
•Wrench set
•Screwdriver
•Torque wrench

Parts Required

•Transmission fluid (as specified in the owner’s manual)
•New brake light switch (if required)
•Transmission Control Module (if required)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related trouble codes.
2
Inspect the transmission fluid level and condition; low or contaminated fluid can affect shifting.
3
Check the gear linkage and shifter assembly for proper adjustment and any visible damage.
4
Inspect the transmission fluid lines and cooler for leaks and blockages.
5
Test the brake light switch operation; a faulty switch can prevent the vehicle from shifting.
6
Confirm that the battery is fully charged; low voltage can affect electronic transmission controls.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Check Transmission Fluid

Sub-steps:
- Locate the transmission dipstick (if equipped).
- Remove the dipstick, wipe clean, and reinsert it to check the fluid level.
- If low, add the appropriate type of transmission fluid (consult the owner's manual for specifications).

Tools Required:

Transmission fluid (as specified in the owner’s manual)

3. Inspect Gear Linkage

Sub-steps:
- Access the shifter assembly under the dashboard.
- Check for any loose or broken linkage components.
- If adjustments are needed, use the adjustment screws to align the linkage properly.

Tools Required:

Socket set
Wrench set

4. Replace Brake Light Switch (if necessary)

Sub-steps:
- Locate the brake light switch, typically found above the brake pedal.
- Disconnect the wiring harness from the switch.
- Remove the switch from its mounting.
- Install the new brake light switch and reconnect the wiring harness.

Tools Required:

Screwdriver

5. Inspect Transmission Control Module (TCM)

Sub-steps:
- Locate the TCM, usually found near the transmission or under the dashboard.
- Check for any loose connections or corrosion on the connectors.
- If necessary, replace the TCM following manufacturer guidelines.

Tools Required:

Torque wrench (for reinstallation)