how to fix the P0720 code on my Ford F-150 12th Generation (2009-2014)

Ford F-150 12th Generation (2009-2014)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

Error Code: P0720

3 min read

519 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 output speed sensor issues in Ford F-150 (2009-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0720

Affected Component

Transmission

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts.
•Allow the engine to cool before working on the transmission to avoid burns.

Symptoms

•Check engine light illuminated
•Erratic or harsh shifting of the transmission
•Speedometer not functioning correctly
•Unusual engine RPM behavior
•Increased fuel consumption

Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the wiring and connectors leading to the output speed sensor for any visible damage, corrosion, or loose connections.
3
Measure the output voltage of the output speed sensor using a multimeter while the vehicle is in motion.
4
Test the resistance of the output speed sensor to ensure it falls within the manufacturer's specifications.
5
Check the vehicle’s transmission fluid level and condition, ensuring it is clean and at the appropriate level.
6
Inspect the vehicle's Engine Control Module (ECM) for any signs of damage or software issues.

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
•Multimeter
•Torque wrench

Parts Required

•Output speed sensor

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Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the wiring and connectors leading to the output speed sensor for any visible damage, corrosion, or loose connections.
3
Measure the output voltage of the output speed sensor using a multimeter while the vehicle is in motion.
4
Test the resistance of the output speed sensor to ensure it falls within the manufacturer's specifications.
5
Check the vehicle’s transmission fluid level and condition, ensuring it is clean and at the appropriate level.
6
Inspect the vehicle's Engine Control Module (ECM) for any signs of damage or software issues.

Solution

1. Preparation

Gather necessary tools and parts for the repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Remove the Output Speed Sensor

Locate the output speed sensor on the transmission (usually near the tail shaft).
Use a socket set to remove the sensor mounting bolt(s).
Carefully pull the sensor out of its housing, ensuring not to damage the connector.

3. Inspect and Clean

Visually inspect the sensor for any physical damage or wear.
Clean the sensor connector and the area where the sensor mounts to ensure proper contact.

4. Replace the Output Speed Sensor

Install the new output speed sensor in the same position as the old one.
Secure it with the mounting bolt(s) to the specified torque (typically around 8-10 ft-lbs, but check the specific repair manual).
Reconnect the electrical connector, ensuring it clicks into place.

5. Reconnect Battery and Test

Reconnect the negative battery terminal.
Start the vehicle and allow it to reach operating temperature.
Clear the P0720 code using the OBD-II scanner and take the vehicle for a test drive to check for any reoccurrence of the code.