Parts for your 2021 Honda Odyssey-Gas struts

2021 Honda Odyssey gas-struts: what they do and when to replace them

Based on Honda’s 2021 Odyssey service information (Body/Doors – Tailgate and Power Tailgate System) and the Honda genuine parts catalogue for this model series, the vehicle uses gas‑pressurised struts on the rear tailgate. The bonnet is supported by a prop rod (no gas struts), so gas‑struts are relevant to the tailgate only.

On the 2021 Odyssey, the tailgate gas‑struts counterbalance the weight of the door so it lifts smoothly and stays safely open. On power tailgate variants, they work alongside the electric drive to control opening speed and reduce motor load. That means easier access for the family and less strain on the power tailgate hardware.

There’s no fixed replacement interval for these struts, they’re replaced on condition. Typical signs they’re due include the tailgate feeling heavy, dropping or not staying up, slowing down in cold weather, or showing an oily film on the rod. Squeaks, binding, corrosion at the ball sockets, or a visible bend in the shaft also point to fatigue. Because the tailgate relies on a matched pair, they should be replaced together.

• Choose struts specified for the 2021 Odyssey and for power or manual tailgate as applicable.
• Support the tailgate securely (or have a helper) before releasing the spring clips and popping the sockets off the balls.
• Do not twist the rod during install, press the socket straight onto the ball until it clicks.
• Keep the chrome shaft clean and dry, don’t apply grease or silicone to the rod as this attracts grit and ruins seals.
• Inspect hinge fasteners and tailgate alignment after fitment.

For power tailgates, it’s good practice to initialise the system after strut replacement. Set the desired open height, then press and hold the tailgate button until you hear the confirmation beep, some trims may require a keyfob or dash‑switch hold to store the height. If the system behaves oddly, consult the service procedure for power tailgate control unit learning.

Handy servicing tip: give the tailgate a quick open/close each week and wipe the strut shafts with a clean, lint‑free cloth. After five or so years—especially in colder climates—keep an eye out for the early symptoms above. Note: the Odyssey’s bonnet uses a prop rod, so bonnet gas‑struts aren’t applicable on this model.

Popular questions

Does the 2021 Honda Odyssey bonnet use gas‑struts?
No. The 2021 Odyssey bonnet is held up by a simple prop rod. Honda’s service documentation for the Hood section confirms there are no gas‑struts fitted to the bonnet on this model year.

How long do Odyssey tailgate gas‑struts typically last?
It varies with climate and usage, but five to ten years is common. Frequent use, heat/cold cycles, and dirt on the rod seals shorten life. If the tailgate won’t stay up, slows in the cold, or shows oil mist on the shaft, they’re due.

Do both tailgate struts need replacing at the same time?
Yes—replace in pairs. A new strut paired with a weak one can twist the tailgate, stress the power actuator on equipped models, and shorten the life of the remaining old strut.