2021 Acura RDX: what breaks, and at what mileage

What owners report breaking

Owners have reported 34 named failure modes on the 2021 Acura RDX, and the three most-reported carry 28% of everything filed, which is an unusually even spread for one model year.

Other engine problem leads with 19 reports and about 0.9 per 1,000 vehicles.

Sunroof failure or glass breakage follows with 16 reports, median 5,000 miles.

Control module (ECM/PCM/BCM) failure follows with 10 reports, median 30,000 miles.

By system, the reports fall mostly into engine (25), body (21) and adas (19).

How bad it is when it goes

Across the named modes, 7 mention a crash and 2 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 3.84, 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 engine problem at $300–$4,000, sunroof failure or glass breakage at $700–$4,500, control module (ECM/PCM/BCM) failure at $700–$3,000 and other brake problem at $300–$1,800. Dealer labour, a seized bolt or a part that is no longer made can push any of these past the top of its range.

23% 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 Acura RDX draws about 7.5 per 1,000 vehicles, which puts it in the 88th 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 21,431 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 3 recall campaigns covering the 2021 Acura RDX, affecting an estimated 22,644 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 and power train:driveline:driveshaft. 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.

Better and worse years of the same car

High risk for a 2021 — 118th riskiest of the 231 2021 vehicles we can rate. Because the ranking is against the same model year only, age cancels out of it.

Across the 19 model years of this car that carry enough reports to score, 2008 comes out best at 59 and 2017 worst at 82, with 2021 itself at 74.

If the model year is negotiable, 2008, 2011, 2007, 2015, 2009, 2014, 2010, 2012, 2013 and 2016 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 2016–2022 generation specifically, 2016 is the strongest year at 69 and 2017 the weakest at 82.

What this page cannot tell you

161 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 161 reports, 18 carried an odometer reading, so the mileages here describe 11% 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.