2020-2025 Honda Odyssey Power Tailgate Motor: Diagnosing Sagging, Beeping, and Failure to Open
This guide explains why your power liftgate fails, helping you distinguish between a bad motor, a faulty control unit, or a failed support strut.
- The most common cause of tailgate failure is NOT the motor, but a separate Power Tailgate Control Unit that gets damaged by a known water leak issue.
- If your tailgate sags or closes by itself, the problem is a faulty right-side support strut, covered by Honda TSB 22-018.
- Before buying any parts, inspect the control unit for corrosion and scan the system for trouble codes.
- The motor itself does not require programming, but the system should be reset by cycling the power after installation.
Is It Your Motor, Control Unit, or Strut?
Before you replace the power tailgate motor on your 2020-2025 Honda Odyssey, it's critical to understand that three different parts can cause nearly identical symptoms. Diagnosing the correct component is key to avoiding unnecessary repairs.
- The Power Tailgate Motor (Part # 74961-THR-A02): This is the motor itself. Failure is possible but less common than the other issues. Symptoms point to this if you hear grinding or no sound at all from the driver's side rear pillar when the gate should be moving.
- The Power Tailgate Control Unit (Part # 74970-THR-A03): This is the 'brain' for the tailgate system. It is notoriously prone to failure due to water damage. A known defect in body seam sealing can allow water to leak into the driver's side rear quarter panel, shorting out this module. This is the most likely culprit if the tailgate acts erratically, stops working entirely, or causes a parasitic battery drain.
- The Right Tailgate Support Strut/Spring (Part # 74931-THR-A01): If your primary complaint is the tailgate slowly sagging down after opening, or beeping and closing itself, the cause is likely a failed internal damper in the passenger-side support strut. Honda issued Technical Service Bulletin (TSB) 22-018 for this exact issue.
Warning: A class action investigation has been launched regarding water leaks causing power tailgate control unit failure in 2018-2021 Honda Odyssey models. The leak often originates from a poorly sealed body seam in the roof channel above the driver's side C-pillar.
Symptoms of Failure
A problem in the power tailgate system can manifest in several ways. Note that most of these symptoms can be caused by either the motor or the control unit.
- Tailgate won't open or close: Pressing the button on the key fob, dash, or tailgate itself does nothing.
- Beeping and Reversing: 🎬 See how a faulty pinch sensor can cause the gate to reverse. The tailgate starts to open or close, then stops, beeps multiple times, and reverses direction.
- Tailgate Sags or Won't Stay Open: The gate powers open but then slowly drifts downward or closes on its own. This points specifically to the TSB for the right support strut.
- "Check Power Tailgate" Warning: An error message appears on the instrument panel, indicating a Diagnostic Trouble Code (DTC) has been stored in the control unit.
- Parasitic Battery Drain: A faulty, water-damaged control unit can stay 'awake' when the vehicle is off, draining the battery.
- No Final Latch/Cinch: The tailgate closes but doesn't pull itself fully shut, leaving a 'Tailgate Ajar' warning on the dash. This can be a symptom of a failed latch assembly or a misaligned gate.
Step-by-Step Diagnosis
- Check for TSB 22-018 Symptoms: Does your tailgate sag or close by itself after opening? If so, your problem is almost certainly the right-side support strut, not the motor.
- Inspect for Water Intrusion: 🎬 Watch this troubleshooting guide to find and fix common tailgate failures. Remove the interior trim panel on the driver's side of the cargo area. The Power Tailgate Control Unit is located there. Look for any signs of moisture, rust, or blue/green corrosion on the module's casing or connectors. If you see any, the control unit is the problem.
- Listen to the Motor: Have a helper press the tailgate button while you stand near the driver's side D-pillar (behind the rear side window). You should hear the motor whir. If you hear grinding, clicking, or nothing at all, the motor or its clutch may be the issue.
- Check Fuses: The power tailgate system uses several fuses. A key one is the 20A fuse #17 located in the driver's under-dash fuse box, labeled 'PTG Closer'. Check this and other related fuses before proceeding.
- Scan for Codes: The most definitive diagnostic step is to use a professional-grade scan tool to read codes from the 'Power Tailgate' module. Codes like 'power tailgate motor clutch circuit malfunction' will point directly to the source of the problem.
Buying a Used Trunk Lid Pull Down Motor
A recycled OEM motor is an excellent way to save money, as the motor itself is generally reliable. The control unit is the more common failure point.
- Verify Part Numbers: Ensure the part number matches. The current part is 74961-THR-A02, which supersedes the older 74961-THR-A11. Either number will work.
- Inspect the Connector: Ask for clear photos of the electrical connector on the motor. Look for any signs of corrosion, bent pins, or heat damage. Do not buy a motor with a damaged connector.
- Physical Inspection: Check for cracks in the plastic housing or damage to the linkage arm. The unit should be clean and free of any signs of water damage, though this is more critical for the separately-sold control unit.
- Why Used OEM is a Smart Choice: A used OEM motor is built to Honda's original specifications. Given that the primary issue in this system is often the control unit or support strut, a functioning used motor offers significant savings over a new OEM part, with little compromise in reliability. New aftermarket options for this specific part are not widely available as of early 2026.
Pro Tip: After replacing the motor, control unit, or strut, you may need to reset the system. The official procedure involves reconnecting all components, ensuring the tailgate is closed, and then using the power tailgate button to cycle it through a full open and close sequence. This allows the control unit to relearn the gate's position and limits.
Cost of Replacement
| Part/Service | Estimated Cost |
|---|---|
| New OEM Motor | $310 - $465 |
| New Aftermarket Motor | Not Widely Available |
| Used OEM Motor | $100 - $175 |
| Shop Labor to Replace Motor | $200 - $350 |
| New OEM Control Unit (If Needed) | $180 - $225 |
Frequently Asked Questions (FAQ)
Does the new motor need to be programmed?
No, the motor itself is not programmed. However, after installing a new motor or other system component, you should perform a system reset by cycling the tailgate fully open and closed with the power button. This allows the existing Power Tailgate Control Unit to recalibrate.
Why does my tailgate sag or close by itself after opening?
This specific symptom is almost always caused by a failed internal damper in the passenger-side (right) support strut, not the motor. Honda has a Technical Service Bulletin (TSB 22-018) that addresses this exact problem. Replacing the right support strut is the correct fix.
I replaced the motor, but the tailgate still doesn't work. What's wrong?
The most likely cause is a failed Power Tailgate Control Unit, often due to water damage. This is a separate electronic module located behind the driver's side cargo area trim. You should inspect it for corrosion. It's also possible a fuse is blown or there is a wiring issue.
Can I just close the tailgate manually if the motor is broken?
Yes, you can. If the power function fails, you can manually open and close the tailgate. However, if the failure is due to a faulty latch or a problem that prevents the gate from securing, it may not stay closed, which is a safety hazard while driving.
Helpful Videos
Technical Specifications
OEM Part Numbers: 74961-THR-A02 74961-THR-A11 74961THRA020M1
This is the main power liftgate drive motor, located in the driver's side D-pillar. It is distinct from the Power Tailgate Control Unit (74970-THR-A03) and the latch assembly.
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.
- Honda Odyssey: