2017-2019 Outback & 2017 Legacy Liftgate Module: Fixing Beeps, Battery Drain & Failures

Symptoms of a Failing Liftgate Control Module

A bad liftgate control module can cause a variety of frustrating issues. While some problems can be fixed with a simple reset, these symptoms often point to a faulty module, especially if they are persistent or intermittent.

• Three Beeps, No Action: The most common symptom. You press the open or close button, the vehicle beeps three times, but the liftgate does not move. This indicates the system has detected a fault and has entered a protective mode.
• Liftgate Will Not Latch: The gate closes but fails to latch securely. This often triggers a "Liftgate Open" warning on the dashboard and may be accompanied by constant beeping while driving.
• Inoperable from Any Button: The liftgate does not respond to commands from the key fob, the interior dashboard button, or the button on the gate itself.
• Opens Partially and Reverses: The gate starts to open, often just a few inches, then shudders and closes on its own. This can be caused by faulty sensors or a confused module.
• Dead Battery (Parasitic Draw): A known issue with the original module (part number 63350AL10A) can cause a parasitic battery drain. The module fails to let the vehicle's communication network (CAN bus) go to sleep, slowly draining the battery, especially when the liftgate is left open.
• Constant Beeping While Driving: If the module thinks the latch is not secure, it will trigger a continuous beeping alert once the vehicle is in motion.

Associated OBD-II Diagnostic Trouble Codes (DTCs)

A professional scan tool that can read Body (B-series) codes may reveal specific faults stored in the Power Rear Gate module. Common codes include:

• B2500: Power Supply Voltage Failure (often related to a weak vehicle battery)
• B2501: PRG ECU Malfunction (a direct indicator of an internal module failure)
• B2506 / B2507: PRG Motor Current Surge / PRG Motor Open (indicates an issue with the liftgate motor or its circuit)
• B2513 / B2515 / B2516 / B2517: Latch Condition Failure / Latch SW Failure / Sector SW Failure / Courtesy SW Failure (codes related to the latching mechanism and its internal switches)
• B251A: LIN Connection Failure (a communication error between the module and other components)

Known Issues, TSBs, and Recalls

Technical Service Bulletin 07-179-20: Battery Drain

Subaru issued this TSB in October 2020 to address customer complaints of dead batteries on the 2017-2019 Outback. The investigation found that the original liftgate control module logic would keep the vehicle's CAN communication system active if the rear gate was left open for an extended time. This constant activity resulted in a parasitic electrical draw that could drain the battery.

The fix was a redesigned module with updated logic that allows the system to properly "go to sleep." The new, improved part number is 63350AL10B, which supersedes the original 63350AL10A.

Technical Service Bulletin 07-195-21: Replacement Procedure Update

This bulletin from June 2021 updates the official service procedure for replacing the module. It instructs technicians to check and record the owner's custom liftgate opening height *before* removing the old module. After installing the new one, this height must be re-registered to restore the owner's setting and prevent potential damage from the gate opening too high in a garage.

Buying a Used Liftgate Control Module

Since no aftermarket or remanufactured versions of this module are commonly available, your choices are a new part from a dealer or a used OEM module from a recycled vehicle. A used module can be a reliable and cost-effective solution.

• Verify the Part Number: The most critical step. Match the part number exactly. For these vehicles, you will be looking for 63350AL10A or the updated 63350AL10B. Whenever possible, choose the '10B' version to get the fix for the battery drain issue.
• Inspect for Damage: Check the module's casing for any cracks or signs of water intrusion. The connectors should be clean, with no bent or corroded pins.
• Source Vehicle Information: If possible, know the mileage of the donor vehicle. A module from a lower-mileage vehicle is generally preferable, though these modules are not typically high-wear items.
• Why Used OEM is a Good Choice: A used OEM module is identical to the part your car was built with. It will have the correct software and hardware, ensuring compatibility. Unlike some other electronic modules, this one does not need to be programmed to the vehicle's VIN by a dealer, making a used part a plug-and-play solution, provided you perform the initialization procedure.

Programming and Initialization Requirements

How to Initialize the Power Rear Gate (2017-2019 Outback/Legacy)

This procedure should be performed after installing a new module or after disconnecting the vehicle's battery.

1. Ensure the vehicle's ignition is OFF.
2. Manually open the power rear gate fully.
3. Manually push the gate to the desired opening height (e.g., to clear your garage ceiling).
4. Locate the "Memory" button on the driver's side dashboard (near your left knee) and press it to the "ON" position.
5. On the liftgate itself, press and HOLD the round "close" button located on the inside edge.
6. Continue holding the button until you hear a single electronic chirp and the vehicle's hazard lights flash three times.

The system has now learned the new position and is initialized. You can test it by closing the gate and then opening it with the key fob or dash button.

Replacement Overview

Replacing the module is a feasible DIY project for someone comfortable with removing interior trim panels. It does not require specialized tools beyond basic hand tools.

• Location: The module is located behind the trim in the driver's side rear quarter panel, in the cargo area.
• Difficulty: 3 out of 5. The main challenge is carefully removing the plastic trim without breaking any clips.
• Estimated Time: 1 to 1.5 hours.

Basic Steps:

1. Disconnect the negative terminal from the car battery and wait at least 60 seconds.
2. Remove the rear cargo floor and foam trays.
3. Remove the rear seat cushion assembly.
4. Carefully pry off and remove the driver's side D-pillar trim and the rear quarter panel trim to expose the module.
5. Disconnect the harness connectors from the module in the specified order (the TSB notes a specific order to prevent setting fault codes).
6. Unbolt the module and remove it.
7. Installation is the reverse of removal. Be sure to connect the harnesses in the reverse order they were disconnected.
8. Reconnect the battery and perform the initialization procedure described above.

Cost Comparison

Here is an estimated cost breakdown for replacing the liftgate control module. Prices can vary by location and supplier.

Frequently Asked Questions (FAQ)