how to fix the P0720 code in my Ford F-150 13th Generation (2015-2020)

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0720

3 min read

463 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 P0720 transmission issues in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Error Code

P0720

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 working on the transmission.

Symptoms

•Check engine light illuminated
•Erratic or harsh shifting of the transmission
•Speedometer malfunctioning or reading incorrectly
•Engine stalling or poor acceleration
•Reduced fuel efficiency

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the output speed sensor wiring and connectors for damage, corrosion, or loose connections.
3
Check the output speed sensor's resistance with a multimeter to determine if it’s within specifications.
4
Verify the operation of the transmission control module (TCM) by checking for updates or faults.
5
Inspect the vehicle's transmission fluid level and condition.

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

Parts Required

•Output speed sensor

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0720 and check for any related codes.
2
Inspect the output speed sensor wiring and connectors for damage, corrosion, or loose connections.
3
Check the output speed sensor's resistance with a multimeter to determine if it’s within specifications.
4
Verify the operation of the transmission control module (TCM) by checking for updates or faults.
5
Inspect the vehicle's transmission fluid level and condition.

Solution

1. Preparation

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

2. Inspect and Replace Output Speed Sensor

Tools Required: Socket set, torque wrench, multimeter, OBD-II scanner.
Sub-steps:
1. Locate the output speed sensor on the transmission (usually near the tailshaft).
2. Remove any components blocking access to the sensor.
3. Unplug the electrical connector from the output speed sensor.
4. Remove the sensor using a socket and ratchet.
5. Install the new sensor by reversing the removal steps, ensuring it is properly seated.
6. Reconnect the electrical connector securely.

3. Check and Repair Wiring

Inspect the wiring harness between the output speed sensor and TCM.
If any wires are damaged or corroded, repair or replace them as necessary.
Ensure all connections are clean and secure.

4. Reconnect Battery and Clear Codes

Reconnect the battery terminals.
Use the OBD-II scanner to clear the P0720 code from the memory.

5. Test Drive

Conduct a test drive to ensure the transmission operates smoothly.
Monitor for any return of the check engine light.