Honda K20C4 Alternator Belt 31110-6B2-A01

Genuine Honda K20C4 Alternator Belt (31110-6B2-A01) - RDX & Accord 2.0T

Your accessory belt is one of those parts that does its job silently for years, right up until it doesn't. On the K20C4, this belt drives your alternator and accessories off the crank, and like any rubber belt, it wears out. It dries, it cracks, it starts squealing on cold mornings, and if you ignore it long enough it lets go and leaves you stranded with a dead battery and no charging. This is the genuine Honda replacement (31110-6B2-A01), so whether yours is cracked and chirping or you're just staying ahead of your maintenance, you put the correct belt back on and forget about it for a long time.

When Should You Replace It?

Good news first: your 2.0T uses a timing chain, not a timing belt, so this accessory belt is the only drive belt you need to think about, and there's no expensive timing-belt service looming. Honda doesn't publish a hard mileage figure for it. Instead, your car's Maintenance Minder calls for periodic belt inspections, and you replace it based on condition. As a practical guideline, most Honda accessory belts get replaced somewhere in the 60,000 to 100,000 mile range, so if you're in that window, it's smart to have it looked at. Beyond mileage, replace it whenever you spot the warning signs: visible cracks or fraying, a glazed shiny surface, or squealing and chirping on startup. Catch it on inspection and you swap a cheap belt on your schedule instead of getting stranded on the side of the road on the belt's schedule.

Why The Genuine Belt Is Worth It

A belt is a belt until it isn't. The length, the rib count, and the material all have to be exactly right, or you get a belt that runs loose, tracks poorly, or wears out early. This is the exact 7-rib EPDM belt Honda spec'd for the K20C4, so it fits the pulley path perfectly and tensions correctly the first time. The EPDM construction matters too: it's the modern belt material that resists heat, cracking, and the gradual hardening that kills older-style belts, so it holds up to years of underhood heat and keeps running quiet. Grabbing the correct Honda belt means you're not back under the hood chasing a squeal from a not-quite-right parts-store belt.

A Smart Time To Replace It

If you've already got the passenger side of the engine apart for other service, this is the moment to put a fresh belt on. Belts are cheap, they're a wear item, and doing it while you're in there costs you almost nothing extra versus coming back to it later when it starts making noise. And if you're chasing a squeal or a chirp on startup, an old, glazed belt is one of the first things to check and one of the easiest to fix. Replace it and that annoying morning noise usually goes with it.

Fits Your K20C4

This alternator belt fits the K20C4 engine found in the 2019-2021 Acura RDX and the 2018-2022 Honda Accord 2.0T. If you're running the K20C4, this is the correct belt for it.

Who Should Grab This Belt

This is for the RDX or Accord 2.0T owner doing scheduled maintenance, chasing a belt squeal, or freshening up the passenger side of the engine while they're already in there. It's an inexpensive genuine part that does an important job, and it's exactly the kind of thing worth doing with the correct Honda piece instead of a guess. Grab it, get it on, and keep your charging system turning the way it should.

Fits: Honda K20C4, 2019-2021 Acura RDX and 2018-2022 Honda Accord 2.0T. Part number: 31110-6B2-A01. Type: genuine Honda alternator / accessory belt. Construction: EPDM, 7-rib. Replacement guide: inspect per Maintenance Minder, typically replaced in the 60,000-100,000 mile range or on signs of wear. Sold: individually.