2021 Honda Odyssey: what breaks, and at what mileage

The failures owners actually file about

Owners have reported 52 named failure modes on the 2021 Honda Odyssey, and the three most-reported carry 24% of everything filed, which is an unusually even spread for one model year.

Other electrical problem leads with 22 reports and about 0.3 per 1,000 vehicles.

Other driver assistance problem follows with 17 reports, median 40,000 miles.

Other engine problem follows with 12 reports, median 85,000 miles.

By system, the reports fall mostly into adas (39), electrical (36) and engine (30).

What happens when these parts fail

Across the named modes, 3 mention a crash, 3 a fire and 3 an injury. Those are the words owners used in their own complaints, and NHTSA does not verify them, but they are the closest thing in this data to a measure of what a failure actually did.

The average severity weight across every report on this year is 3.55, where a stalled engine or a failed airbag weighs many times more than a rattling trim panel, and a figure this high means the reports are dominated by failures with safety consequences rather than annoyances. The weighting is set out in full on the methodology page.

What the top failures cost to put right, as editorial estimates for an independent US shop rather than figures from NHTSA: other electrical problem at $250–$2,000, other driver assistance problem at $250–$1,800, other engine problem at $300–$4,000 and lane keep or steering assist fault at $200–$1,600. Dealer labour, a seized bolt or a part that is no longer made can push any of these past the top of its range.

19% of the reports on this year sit in the engine, transmission, drivetrain or cooling systems — the four where a repair bill is usually four figures.

How often, against how many were built

Scaled by an estimate of how many of these cars exist, the 2021 Honda Odyssey draws about 2.5 per 1,000 vehicles, which puts it in the 79th percentile of complaint rates among 2021 vehicles we can rate.

That denominator is the weakest number on the page and it is fair to say so plainly. Rate per 1,000 uses a fleet-size estimate derived from recall paperwork for this exact model year. It is a lower bound.

The working figure is 88,166 vehicles. If the true number is twice that, every rate on this page is half what it says; the ranking against other 2021 vehicles, which is what the risk score uses, is far more robust than the rate itself.

Recalls on the 2021 model year

NHTSA has issued 8 recall campaigns covering the 2021 Honda Odyssey, affecting an estimated 248,892 vehicles. A recall is a different kind of evidence from a complaint: it is the regulator and the manufacturer agreeing that something has to be fixed, and the fix is free for as long as the car exists.

The campaigns cover air bags:sensor:occupant classification:front passenger, air bags: air bag/restraint control module:software and equipment adaptive/mobility:wheelchair restraints/securement. Whether the work was actually done on the car in front of you is a question only the VIN can answer, and the manufacturer or NHTSA will answer it free.

Recalls also distort complaint counts. Publicity about a campaign reminds owners that complaining is possible, so reports for a recalled component often spike after the recall rather than before it.

How 2021 compares with the other years

High risk for a 2021 — 167th riskiest of the 231 2021 vehicles we can rate. Every score on this site is a rank inside its own model year, which is what makes a 2004 and a 2019 comparable at all.

Across the 31 model years of this car that carry enough reports to score, 1997 comes out best at 59 and 2018 worst at 79, with 2021 itself at 71.

If the model year is negotiable, 1997, 1998, 2017, 1996, 1999, 2005, 2006 and 2009 score lower than 2021 by a margin worth acting on. Same body, same engines, different luck — usually a supplier change or a mid-cycle fix, which the complaint data can show but never explain.

Within the 2021–2023 generation specifically, 2023 is the strongest year at 70 and 2022 the weakest at 76.

The limits of complaint data

216 owner reports; fleet size estimated from this year's own recall paperwork. Every count on this page is therefore a floor: it is the number of owners who went to the trouble of filing with a federal agency, which is a small and self-selected fraction of the owners who had the fault.

Of those 216 reports, 29 carried an odometer reading, so the mileages here describe 13% of the sample rather than all of it. Owners also round: readings pile up on multiples of ten thousand, which is why this site publishes "about 90,000 miles" and not "91,438".

Named failure modes come from matching phrases in the complaint text, so a badly worded complaint can land in the wrong bucket. The effect washes out across hundreds of reports and does not wash out across five.

And nothing here predicts what one car will do. These are other people's complaints, filed years apart, on cars maintained by strangers. Read the page as a map of where this model year has previously gone wrong, then have the specific car in front of you inspected.