2021 Acura RDX Problems & Complaints

Avoid3.5× as many complaints as a typical year of the RDX at the same age

Owners have filed 116 complaints about the 2021 Acura RDX with the National Highway Traffic Safety Administration. That is 3.5× as many as a typical RDX model year at the same age, which makes the 2021 one of the RDX years to avoid. The most reported problem area is the engine & cooling (23 complaints). 3 recalls cover this model year.

116complaints
3recalls
3crashes
0fires
1injuries
0deaths

Most common 2021 Acura RDX problems

  • Other / not specified~3,000 miles
    3127%
  • 2320%
  • Brakes~0 miles
    1614%
  • Windows, wipers & sunroof~60,000 miles
    1513%
  • Transmission & drivetrain~128,000 miles
    1311%
  • Air bags
    119%
  • Body & structure~30,000 miles
    109%
  • Electrical system~30,000 miles
    109%
  • Driver assistance
    76%
  • Speed control & acceleration
    76%
  • Seats
    65%
  • Fuel & propulsion system
    54%
  • Seat belts~15,000 miles
    43%
  • Suspension~1,000 miles
    22%
  • Steering
    22%
  • Lights~30,000 miles
    22%
  • Wheels & tires~1,000 miles
    11%

Share of the 116 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.

Acura RDX complaints by model year

’07’08’09’10’11’12’13’14’15’16’17’18’19’20’21’22’23’24’2553331522161516224441541797744034811631241230
Owner complaints per model year, Acura RDX. Colour = our verdict for that year (red: avoid, orange: caution, green: better than average, blue: too new).

Best RDX years: 2011, 2012, 2010. Years to avoid: 2019, 2015, 2020, 2014, 2021. Compare all years →

2021 Acura RDX recalls (3)

Air bags › Sensor › Occupant classification › Front passenger

NHTSA recall 26V-332 · May 21, 2026 · 98,892 vehicles

Honda (American Honda Motor Co.) is recalling certain 2018-2021, 2023 Acura TLX, 2019-2024 RDX, 2017-2020, 2022-2026 MDX, 2017-2021, 2023, 2025 Honda Ridgeline, 2017-2022 Pilot, 2019-2021 Passport, 2018-2026 Odyssey, 2019-2022 Insight, 2019-2021 HR-V, 2018-2020 Fit, 2020-2022 CR-V Hybrid, 2017-2022 CR-V, 2017-2018, 2021 Civic…

Remedy: Dealers will replace the seat weight sensors, free of charge. Owner notification letters were mailed July 7, 2026. Owners may contact Honda's customer service at 1-888-234-2138.

Air bags › Sensor › Occupant classification › Front passenger

NHTSA recall 24V-064 · Feb 1, 2024 · 750,114 vehicles

Honda (American Honda Motor Co.) is recalling certain 2020-2022 Pilot, Accord, Civic sedan, HR-V, Odyssey, 2020 Civic coupe, Fit, 2021-2022 Civic hatchback, 2021 Civic Type R, Insight, 2020-2021 CR-V, CR-V Hybrid, Passport, Ridgeline, Accord Hybrid, 2020 Acura MDX, 2022 Acura MDX, 2020-2022 Acura RDX, and 2020-2021 Acura TLX…

Remedy: Dealers will replace the seat weight sensors, free of charge. Owner notification letters were mailed March 28, 2024. This is a phased recall. Owners may contact Honda customer service at 1-888-234-2138.

Power train › Driveline › Driveshaft

NHTSA recall 21V-939 · Dec 2, 2021 · 279 vehicles

Honda (American Honda Motor Co.) is recalling certain 2021 Acura RDX and 2022 CR-V Hybrid vehicles. A component in the right or left front driveshaft may have been improperly heat-treated, which could result in driveshaft failure.

Remedy: Dealers will replace the right or left front driveshaft as necessary, free of charge. Owner notification letters were mailed January 24, 2022. Owners may contact Honda customer service 1-888-234-2138.

What 2021 Acura RDX owners say

Engine & cooling all 23 →

While sitting in a long row of stopped vehicles at a traffic light for an extended amount of time due to an accident I had the Automatic Brake Hold feature activated { I did not have to have my foot on the brake while sitting still) as well as the Auto Idle Stop OFF button meaning {the engine shuts down when you come to a stop.} Apparently, the Brake Hold feature timed out with no warning whatsoever and because the vehicle moved forward the Auto Start Stop feature activated at the same time and the vehicle lurched forward rear ending a new expensive SUV in front of me. The impact was hard due to the quick lurch of my vehicle. I have damage to the front of my vehicle and all of the electronic features started flashing including the emission control. …

Apr 2023 · crash

Drove into parking lot and as I was pulling into the parking spot next to the building, the vehicle started to surge forward as if I had my foot on the gas instead of the brake. The sudden surge caused the vehicle to plow into a brick building causing about $10K damage to the vehicle and $5K to the building. This was not the first time this sudden surging occurred. It happened at least 3 times previously, and one time since. Fortunately, the other occurrences did not lead to any damages, but just some anxious moments. I took the vehicle to the dealership to get checked out after the last occurrence, but they said they couldn't duplicate it. I thought it might be some sort of "unknown" problem, until I started reading on Facebook and other internet websites of other people having the same scary "surging" engine issues. I believe there's more to it now, and an investigation is warranted.

May 2024 · crash

Brakes

While sitting in a long row of stopped vehicles at a traffic light for an extended amount of time due to an accident I had the Automatic Brake Hold feature activated { I did not have to have my foot on the brake while sitting still) as well as the Auto Idle Stop OFF button meaning {the engine shuts down when you come to a stop.} Apparently, the Brake Hold feature timed out with no warning whatsoever and because the vehicle moved forward the Auto Start Stop feature activated at the same time and the vehicle lurched forward rear ending a new expensive SUV in front of me. The impact was hard due to the quick lurch of my vehicle. I have damage to the front of my vehicle and all of the electronic features started flashing including the emission control. …

Apr 2023 · crash

While driving on a freeway for about 15 minutes at 65 MPH, the MIL indicator started blinking. The vehicle began to rapidly shake, while the engine power decreased significantly. The engine dramatically went from 65 mph to 35 mph causing a safety hazard while driving on the freeway as we attempted to exit and pull over safely. The vehicle is a 2021 Acura RDX and is driven approximately 10,000 miles per year. All maintenance has been performed in accordance with the manufacturer's schedule. It has not been involved in any collisions or other user risk other than normal driving in accordance with the approved use of the vehicles. Upon trying to restart the vehicle, the vehicle continues to violently shake while in park. Notification lights indicating Brake Failure, AWD failure, Check Emissions System, etc. …

Apr 2024

Windows, wipers & sunroof

The contact owns a 2021 Acura RDX. While driving at an undisclosed speed, there was an abnormal gunshot sound coming from the vehicle. The vehicle was driven to the residence. The contact inspected the exterior of the vehicle but found no failure. The contact stated that the following day, while driving at an undisclosed speed, the panoramic roof glass shattered, and glass shards fell inside the vehicle. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 56,000.

Fixed panaramic roof/sky light assembly · 56,000 miles · Feb 2026

The contact owns a 2021 Acura RDX. The contact stated while the vehicle was stationary in the driveway, he noticed that the rear windshield had shattered. Upon inspection, the contact stated he did not see any near objects that would have caused the windshield to shatter. The contact read online of other vehicle owners experiencing the same failure due to the cold weather. The contact called the local dealer and made them aware of the failure. The vehicle was not repaired but was pending repairs. The manufacturer had not been informed of the failure. The failure mileage was 5,539.

Windshield · 6,000 miles · Dec 2021

2021 Acura RDX engines & fuel economy

EngineTransmissionDriveMPG city / hwy / combined
2.0L 4-cyl turbo10-speed automaticFWD22 / 28 / 24
2.0L 4-cyl turbo10-speed automaticAWD21 / 27 / 23

EPA ratings. Class: Small SUV.

Frequently asked questions

Is the 2021 Acura RDX a good car?

Based on 116 owner complaints filed with NHTSA, the 2021 RDX rates avoid: 3.5× as many complaints as a typical year of the RDX at the same age. It is one of the RDX years we suggest avoiding. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.

What is the most common problem with the 2021 Acura RDX?

The engine & cooling — 23 complaints, 20% of all complaints for this model year. Next are the brakes (16) and windows, wipers & sunroof (15).

How many recalls does the 2021 Acura RDX have?

There are 3 recalls for the 2021 Acura RDX, the most recent from May 21, 2026 (front passenger). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.

What are the best and worst years of the Acura RDX?

The best years by complaints, compared at the same age, are 2011, 2012 and 2010. Years to avoid or approach with caution: 2019, 2015, 2020, 2014 and 2021. See the full Acura RDX years comparison.

At what mileage do 2021 Acura RDX problems happen?

The median mileage reported in complaints is about 30,000 miles; 58% of problems with a recorded mileage started before 50,000 miles.

Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.