2020-2024 Explorer & Police Interceptor Liftgate Sensor: Fixing a Finicky Hands-Free System

Symptoms of a Failing Liftgate Object Sensor

When the liftgate object sensors or their related components begin to fail on your 2020-2024 Ford Explorer or Police Interceptor Utility, the symptoms can be more than just an inconvenience. They often appear intermittently, making diagnosis tricky.

• Hands-Free Feature Inoperative: The most common symptom is the 'kick-to-open' feature simply not working. You can kick under the bumper, but the liftgate does not respond.
• Intermittent or No Operation from Any Button: The problem can sometimes escalate, causing the liftgate to become unresponsive to the key fob, dashboard button, or the button on the liftgate itself.
• Liftgate Opens or Closes Partially: The liftgate might start to open or close, only to stop partway through its travel.
• Vehicle Alarm Randomly Triggered: In some cases, a faulty liftgate system can send an incorrect signal to the vehicle's security system, causing the alarm to go off shortly after locking the vehicle. This may be accompanied by a notification from the FordPass app.
• Error Chimes or Flashing Lights: When you attempt to operate the liftgate, the vehicle may chime or flash its hazard lights once but fail to open the gate, indicating it has received the command but cannot execute it.

Known Issues, TSBs, and Recalls

Before you replace any parts, be aware of several known issues on the 2020-2024 Ford Explorer and Police Interceptor Utility that can mimic a sensor failure. Diagnosing these first can save you significant time and money.

Software Glitches (TSB SSM 49914)

Ford issued Technical Service Bulletin (TSB) 49914 for an inoperative power liftgate on 2020-2021 models. The cause is often not the sensor itself, but a software issue within the Rear Gate Trunk Module (RGTM). A Ford dealership can reprogram the RGTM with updated software, which often resolves the problem entirely. If your liftgate is completely unresponsive, this should be one of your first diagnostic considerations.

Poor Wiring Connection (TSB SSM 50810)

For 2020-2022 Explorer and Aviator models, TSB 50810 points to an inoperative hands-free liftgate caused by a poor wiring connection at connector C4332. This connector is located below the liftgate striker inside the vehicle. Inspecting this connector for loose terminals or a bad connection is a crucial diagnostic step before suspecting the sensors themselves.

Dirty Sensors

The sensors are located under the rear bumper and are exposed to road grime, mud, and salt. Before assuming a part has failed, thoroughly clean the long, black sensor strips under the bumper with soap and water. Many owners have reported that simply cleaning the sensors restored the hands-free function.

No Recalls for Sensors

As of now, there are no active safety recalls for the liftgate object sensors on these vehicles. A recall was issued for liftgate *hinge covers* that could detach, but this is unrelated to the electronic operation of the liftgate.

Diagnosing the Problem

1. Check Vehicle Settings: First, ensure the power liftgate function is enabled in your vehicle's infotainment screen settings. It can be accidentally disabled.
2. Clean the Sensors: Thoroughly wash the underside of the rear bumper where the sensor strips are located.
3. Check for TSBs: If cleaning doesn't work, the next step is to consider the known software and wiring issues. A trip to the dealer for an RGTM software update (SSM 49914) or an inspection of connector C4332 (SSM 50810) may be necessary.
4. Fuse Reset: Some owners have had temporary success by pulling the fuses for the liftgate module and the hands-free system to reset them. While this is often not a permanent fix, it can help indicate an electronic or software-related glitch.
5. Physical Inspection: If all else fails, a physical inspection of the sensors and their wiring behind the bumper cover is the final step. Look for cracks, damage from impacts, or corroded connectors.

Buying a Used Liftgate Object Sensor

If you've determined a sensor has failed, a used OEM part is an excellent, cost-effective alternative to an expensive new part from a dealership. Since reliable aftermarket options are not widely available for these specific sensors, a recycled OEM part is often the best choice.

• Physical Inspection: When buying a used sensor, inspect it closely for any signs of physical damage. Look for cracks in the plastic housing, bent or corroded connector pins, and any fraying or damage to the wiring pigtail.
• Verify Part Numbers: These sensors are side-specific (left and right). Ensure you are buying the correct one. The latest part numbers are LB5Z-78406A76-B (Right) and LB5Z-78406A77-B (Left). These replace the earlier '-A' versions.
• Check for a Set: The sensors are often referred to as a set. While you can replace just the failed side, it's worth inspecting both while the bumper is off.
• Why Used OEM is a Good Choice: For electronic components like this, a used original equipment part that has been tested and verified is often more reliable than a new, unproven aftermarket clone. It was designed by Ford for your specific vehicle, ensuring proper communication with the control module.

Replacement Overview

Replacing the liftgate object sensors requires removing the rear bumper cover. This is a moderately difficult job that can be done by a patient DIYer with basic tools.

• Difficulty: 3 out of 5
• Estimated Time: 2-3 hours
• Tools Needed: Socket set (7mm, 8mm, 10mm), trim removal tools, push-pin puller.

The general process involves:

1. Removing screws from the inner wheel wells and under the bumper.
2. Removing the rear taillight assemblies to access more fasteners.
3. Carefully prying away trim and releasing clips holding the bumper cover to the body, starting from the sides and working toward the center.

4. Warning: Before fully removing the bumper cover, have a helper support it. You must disconnect the main wiring harness that powers the sensors and lights before you can pull the bumper away from the vehicle.

5. Once the bumper cover is off, the sensors and their control module will be accessible for replacement. They are typically held in by clips or small screws.
6. Installation is the reverse of removal. Ensure all electrical connectors are securely reconnected before reattaching the bumper.

Cost Comparison

The cost to fix a faulty liftgate sensor can vary dramatically depending on whether the issue is software or a failed hardware component.

Frequently Asked Questions (FAQ)