2017-2019 Subaru Outback Power Liftgate Module: Fixing Battery Drain and Hatch Failures
This guide covers the common failures of the Power Rear Gate (PRG) control module, including the well-known battery drain issue, and how to diagnose and replace it.
- This is the Power Liftgate Module, NOT the main Body Control Module. It only controls the rear hatch.
- A faulty module is a known cause of parasitic battery drain, addressed by Subaru TSB 07-179-20. The updated part is 63350AL10B.
- This module does NOT require dealer programming. A simple, DIY initialization procedure is performed by holding the button on the hatch after installation.
- Symptoms include a dead battery, a liftgate that won't open (often with 3 beeps), or a liftgate that won't latch closed.
Known Issues, TSBs, and Recalls
TSB 07-179-20: Parasitic Battery Drain
The most significant known issue for this part is detailed in Subaru Technical Service Bulletin (TSB) 07-179-20. Owners reported that the vehicle's battery would die, especially if the rear liftgate was left open for an extended time. The investigation found that the original PRG control module's software logic would keep the vehicle's communication network (CAN bus) 'awake', causing a slow but steady drain on the battery. Subaru released an updated module (part number 63350AL10B) that supersedes the original (63350AL10A). This new module contains revised software that allows the CAN bus to properly 'go to sleep', preventing the parasitic draw. This is a critical issue to be aware of, as these Outback models are also known for other battery drain problems related to the Data Communications Module (DCM), and it's important to distinguish the cause.
Pro Tip: If you are experiencing a dead battery and own a 2017-2019 Outback, this PRG module is a likely culprit, especially if the problem seems to occur after using the rear hatch. When buying a used replacement, look for the updated part number 63350AL10B.
Symptoms of a Failing Power Liftgate Module
A failing PRG control module can cause several obvious and not-so-obvious problems. Here are the most common signs:
- Inoperative Power Liftgate: The most common symptom is the hatch failing to open or close when you press the button on the key fob, dashboard, or the gate itself.
- Three Beeps, No Action: Many owners report the system will emit three quick beeps when a button is pressed, indicating a fault has been detected and the gate will not move.
- Hatch Fails to Latch or Unlatch: The module may fail to operate the electronic latch, leaving the gate stuck closed or unable to pull itself fully shut. This can trigger a 'Liftgate Open' warning on the dash.
- Parasitic Battery Drain: As detailed in the TSB, a faulty module can drain the battery, often overnight or over a few days, even if the liftgate appears to be working normally.
- Erratic Behavior: The gate may open or close partially, stop mid-travel, or work intermittently. This is often more common in hot weather.
Diagnostic Trouble Codes (DTCs)
If you have access to an advanced OBD-II scanner that can read body codes, you may find specific DTCs stored in the PRG system. These codes can confirm a module or related component failure:
| DTC Code | Description |
|---|---|
| B2500 | Power Supply Voltage Error |
| B2501 | PRG ECU Malfunction (Internal module failure) |
| B2506 | PRG Motor Current Surge (Possible obstruction or failing motor) |
| B2507 | PRG Motor Open Circuit (Wiring issue or bad motor) |
| B2519 | POWER +B Open (Power supply circuit failure) |
Replacement and Initialization
The PRG control module is located in the rear of the vehicle, inside the driver's side quarter panel trim. According to service documents, replacement requires removing the rear seat cushion and the large plastic trim panel in the cargo area to gain access. While not technically difficult, it requires care to avoid breaking plastic clips.
Warning: Before starting work, disconnect the negative terminal of the battery and wait at least 60 seconds to allow the system to fully discharge. This prevents electrical shorts and potential damage to other modules.
Post-Installation Initialization (No Dealer Programming Required)
A major advantage is that this module does not require expensive dealer programming or flashing. However, it must be initialized after installation or after the battery has been disconnected. If the system is not initialized, it may beep and refuse to operate.
The reset procedure is simple:
- Ensure the new module is connected and the battery is reconnected.
- Press and hold the outer button on the liftgate (under the Subaru logo) for 5-10 seconds.
- You should hear or feel the latch mechanism cycle or click.
- The system is now reset, and the power liftgate should function normally. 🎬 See this quick walkthrough of the liftgate reset procedure. You may need to reset your preferred opening height memory. 🎬 Watch: How to program and adjust your liftgate opening height.
Buying a Used Power Liftgate Module
Purchasing a used OEM PRG module is a cost-effective and reliable repair strategy. Since this is a solid-state electronic part with no moving components, a tested unit from a reputable recycler is an excellent alternative to a new part.
- Verify the Part Number: Whenever possible, purchase the updated part number, 63350AL10B, to ensure you have the fix for the battery drain issue. However, the original part 63350AL10A will also work if the battery drain is not your primary concern.
- Inspect Connectors: Check the electrical connector pins on the used module. Ensure they are straight, clean, and free of any corrosion or water damage.
- No VIN Matching: This module is not tied to a specific vehicle's VIN, so a compatible part from any 2017-2019 Outback with a power liftgate will work without needing to be reprogrammed by a dealer.
Cost Breakdown
The cost to replace the PRG control module can vary, but buying a used part can offer significant savings.
| Item | Estimated Cost |
|---|---|
| New OEM Module | $140 - $210 |
| Used OEM Module | $50 - $85 |
| Shop Labor | $150 - $250 (1.5-2.0 hours) |
| Total DIY Cost (Used Part) | $50 - $85 |
| Total Shop Cost (New Part) | $290 - $460 |
Frequently Asked Questions (FAQ)
Is this the same as the main Body Control Module (BCM)?
No. This is the Power Rear Gate (PRG) Control Module, a separate computer dedicated only to the power liftgate. The main BCM controls other functions like interior lights, power windows, and door locks. Your vehicle has multiple electronic modules.
Does a replacement liftgate module need to be programmed by a Subaru dealer?
No, dealer programming is not required. You can install a new or used module yourself. However, you must perform a simple initialization procedure by holding the button on the rear hatch for several seconds until the latch cycles.
Why does my 2018 Outback battery keep dying?
There are two common causes on these vehicles. One is a faulty Power Rear Gate (PRG) module that fails to let the car's computer system 'sleep', as described in TSB 07-179-20. The other common cause is a faulty Data Communications Module (DCM), which was subject to a class-action lawsuit for causing parasitic battery drain. Diagnosing which module is at fault is key to solving the problem.
My liftgate just beeps three times. Is the module bad?
Three beeps is the system's generic fault signal. It means the module has detected a problem and is refusing to operate the gate for safety. The cause could be a bad module, a faulty latch, an obstruction, or simply that the system needs to be reset. Try the initialization procedure (holding the hatch button for 10 seconds) before replacing any parts.
Helpful Videos
Technical Specifications
OEM Part Numbers: 63350AL10A 63350AL10B
Location: Driver side rear quarter panel. Controls power liftgate motor, latch, and sensors. Communicates via CAN bus.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru Outback:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Known Issues, TSBs, and Recalls
- TSB 07-179-20: Parasitic Battery Drain
- Symptoms of a Failing Power Liftgate Module
- Diagnostic Trouble Codes (DTCs)
- Replacement and Initialization
- Post-Installation Initialization (No Dealer Programming Required)
- Buying a Used Power Liftgate Module
- Cost Breakdown
- Frequently Asked Questions (FAQ)
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