what does a P0720 code mean for my Ford F-150 13th Generation (2015-2020)

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

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0720

3 min read

501 words

Problem Statement

Learn how to diagnose and fix P0720 vehicle speed sensor issues in Ford F-150 (2015-2020). 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 the battery before working on electrical systems to prevent short circuits.

Symptoms

•Check engine light illuminated
•Erratic or incorrect speedometer readings
•Transmission shifting issues
•Engine stalling or hesitation during acceleration
•Poor fuel economy

Diagnostic Steps

1
Scan the vehicle's onboard diagnostics using an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the vehicle speed sensor for physical damage or corrosion.
3
Check the electrical connector for the VSS for any loose wires, corrosion, or damage.
4
Measure the voltage output of the VSS with a multimeter to ensure it meets manufacturer specifications.
5
Inspect the wiring harness between the VSS and the engine control unit (ECU) for any signs of wear or damage.
6
Perform a continuity test on the VSS circuit to ensure there are no breaks in the wiring.

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

•Vehicle speed sensor (VSS)
•Electrical connector (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostics using an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the vehicle speed sensor for physical damage or corrosion.
3
Check the electrical connector for the VSS for any loose wires, corrosion, or damage.
4
Measure the voltage output of the VSS with a multimeter to ensure it meets manufacturer specifications.
5
Inspect the wiring harness between the VSS and the engine control unit (ECU) for any signs of wear or damage.
6
Perform a continuity test on the VSS circuit to ensure there are no breaks in the wiring.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the vehicle battery to ensure safety during work.

2. Remove the Vehicle Speed Sensor

Locate the vehicle speed sensor on the transmission (usually near the output shaft).
Disconnect the electrical connector from the VSS.
Remove the mounting bolt(s) using a socket set.
Carefully pull out the VSS from its housing.

3. Inspect and Replace

Examine the old sensor for signs of wear or damage.
If the sensor is faulty, install a new vehicle speed sensor.
- Apply a small amount of engine oil to the O-ring of the new sensor to ensure a proper seal.
Insert the new sensor into the transmission and secure it with the mounting bolt(s) to the specified torque (consult service manual for exact torque specifications).

4. Reconnect Electrical Connections

Reconnect the electrical connector to the new VSS.
Ensure the connection is secure and free of corrosion.

5. Reconnect Battery and Test

Reconnect the vehicle battery.
Start the engine and check for any warning lights.
Test drive the vehicle to ensure that the speedometer functions correctly and that the check engine light remains off.