Parts for your 2021 Honda Civic-Gas struts

2021 Honda Civic gas struts — what’s fitted and how to look after them

Based on Honda’s technical information, gas-charged lift supports are fitted to the 2021 Honda Civic Hatchback on the rear tailgate, while the 2021 Civic Sedan generally does not use gas struts for the bonnet or boot. Honda Service Information for the 2016–2021 Civic range and the Honda electronic parts catalogue show tailgate support struts for FK-series Hatchback models, and a bonnet prop rod plus torsion-bar boot counterbalance on FC-series Sedans. That makes gas struts directly relevant for hatch owners, and typically not required on sedans.

Why the difference? For the Sedan, a prop rod is light, reliable and inexpensive for the bonnet, and torsion bars give a compact, cost-effective counterbalance for a conventional boot lid. The Hatchback’s large, top-hinged tailgate needs controlled lift assistance and damping that torsion bars alone can’t deliver neatly, hence the use of gas-charged struts. These design choices appear in Honda’s body/exterior diagrams and parts listings for the 2016–2021 Civic platform.

For 2021 Civic Hatchback owners, the tailgate gas struts do the heavy lifting: they help raise the hatch smoothly, hold it open securely, and damp movement so it doesn’t slam shut. Over time, seals wear and gas pressure drops, especially with heat, cold, or dust exposure. That’s when the tailgate may rise slowly, fail to stay up, or drop unexpectedly — not ideal when loading the groceries.

As part of routine servicing, it’s smart to give the struts a quick once-over. Wipe the chrome shafts with a clean, dry cloth to keep grit off the seals. Avoid silicone sprays or oil on the shafts — they can swell seals and shorten life. If performance declines, replacement is straightforward and usually done in pairs to keep lift and damping even. Always support the hatch securely (prop, helper, or a brace) before removing any strut, and inspect the ball studs and retaining clips for wear or corrosion while you’re there. Quality aftermarket or genuine parts both work, the key is correct fitment and good clips. In typical Aussie and Kiwi conditions, many struts last 5–10 years, but frequent use, high temperatures, or coastal air can shorten that. If the hatch won’t stay up or feels heavy, don’t wait — sort it before it becomes a safety risk.

• Signs they’re tired: hatch drops or sags, slow or uneven lift, extra effort to open, visible oil mist at the seal, or a knocking sound at full travel.
• Service tips: replace in pairs, support the hatch, check/replace clips and ball studs, keep shafts clean, and avoid grabbing or clamping the chrome rods.

Note for Sedan owners: The 2021 Civic Sedan uses a bonnet prop rod and boot torsion bars, so gas struts aren’t fitted from factory for those functions.

FAQs

Does a 2021 Honda Civic have gas struts?
Yes, if it’s a Hatchback — the rear tailgate uses gas struts. The Sedan typically does not use gas struts for the bonnet or boot, it has a bonnet prop rod and torsion bars for the boot. A quick look at the rear: a Hatchback has side-mounted struts on the tailgate, a Sedan does not.

How long do the tailgate gas struts last on a 2021 Civic Hatchback?
Many last 5–10 years, but climate, usage, and contamination can shorten that. If the hatch stops holding itself up, opens sluggishly, or shows oil at the seal, they’re due. Replacing them early helps avoid damaged hinges — and a whack to the head.

Can only one strut be replaced, or should both be done?
It’s best practice to replace both. Pairing keeps the lift even, protects the hinges, and restores the smooth, factory feel. Mixing an old and new strut can twist the tailgate and stress mounts.