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2021 Acura Rdx Maintenance Schedule

Manufacturer-recommended service intervals for the Maintenance Minder and open recall alerts for your 2021 Acura Rdx.

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Recalls3Full scheduleKnown issues8

How Acura schedules service: Maintenance Minder

Acura's Maintenance Minder calculates oil life from real engine conditions and shows service codes instead of fixed mileages — code A or B (oil / oil + inspection) plus sub-codes for items like tire rotation (1), air filters (2), or transmission fluid (3). Follow the codes, not the calendar. One interval you should never stretch: most Acura 3.5L V6 engines (MDX, TL) use a timing belt with a roughly 105,000-mile / 7-year replacement — a snapped belt on this interference engine means bent valves. SH-AWD models add a rear-differential fluid service that's essential for the torque-vectoring unit.

⚠️

3 Open Recalls

Source: NHTSA

POWER TRAIN:DRIVELINE:DRIVESHAFT

Campaign #21V939000 · Feb 12, 2021

Issue: 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.

Risk: Driveshaft failure can cause a sudden loss of drive power, or cause the vehicle to roll away when parked if the parking brake is not applied. Either condition can increase the risk of a crash or injury.

Fix: 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. Honda's numbers for this recall are BBY, NBW, and OBX.

AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER

Campaign #24V064000 · Jan 2, 2024

Issue: 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 vehicles. The front passenger seat weight sensor may crack and short circuit, failing to suppress the air bag as intended.

Risk: An air bag that deploys unintentionally during a crash can increase the risk of injury.

Fix: 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. Honda's numbers for these recalls are XHP and VHQ.

AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER

Campaign #26V332000 · May 21, 2026

Issue: 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 Type R, 2017-2021 Civic hatchback, 2016-2020 Civic coupe, 2016-2022 Civic, 2017-2022 Accord Hybrid, and 2016-2022 Accord vehicles. The front passenger seat weight sensor may crack and short circuit, which can cause the air bags to deploy unintentionally during a crash.

Risk: Air bags that deploy unintentionally during a crash increase the risk of injury.

Fix: 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. Honda's numbers for this recall are BOL, WO9, OOA, WOM, XOH, NOC, POD, BOE, UOF, POB, EOG, AOI, QO8, TOJ, DO7, and SOK. This recall expands previous NHTSA recall number 24V064. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning May 29, 2026.

Recall data refreshed Jul 26, 2026.

Essential maintenance

Critical for safety and preventing major damage

🛢️

Oil & Filter (Maintenance Minder A/B)

Every 8,000 mi

Change when the Maintenance Minder reaches 15% oil life or shows code A/B — typically every 7,500-10,000 miles with 0W-20 synthetic. Short-trip city driving triggers the code sooner; that's the algorithm doing its job.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

⏱️

Timing Belt (3.5L V6 — MDX, TL)

Every 105,000 mi

J-series V6: replace the timing belt around 105,000 miles or 7 years (Maintenance Minder sub-code 4). It's an interference engine — a failed belt destroys valves. Replace the water pump and tensioner in the same job. (2022+ MDX 3.5L remains belt-driven; the Integra's turbo four is chain-driven.)

Estimated cost — typical U.S. ranges

Dealer

~$935–$1175

Shop

~$655–$825

DIY

Pro only

On interference engines, a snapped belt destroys valves. Worth doing on schedule. Bundle water pump + tensioner — labor is already there.

🔄

Tire Rotation (Sub-code 1)

Every 7,500 mi

Rotate when sub-code 1 appears — roughly every 7,500 miles. SH-AWD models: keep tread depths matched across all four corners.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

🛑

Brake Inspection

Every 10,000 mi

Inspect pads, rotors, and fluid level with every A/B service. Type S models with Brembo front calipers: pads wear faster and cost more — budget ahead.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

🧪

Brake Fluid

Every 30,000 mi

Replace every 3 years regardless of mileage — Honda/Acura schedules this on time because the fluid absorbs moisture.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

⚙️

Transmission Fluid (Sub-code 3)

Every 30,000 mi

Replace ATF when sub-code 3 appears — commonly every 30,000-60,000 miles depending on duty. Use Honda/Acura ATF only (DW-1, or the 10-speed's specified fluid); aftermarket 'universal' ATF causes shudder in these gearboxes.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

🔧

SH-AWD Rear Differential Fluid

Every 30,000 mi

SH-AWD (MDX, TLX, RDX): replace the rear differential fluid roughly every 30,000 miles (sub-code 6) — the torque-vectoring clutch packs run in this fluid, and whining or binding in tight turns is the classic overdue symptom.

Estimated cost — typical U.S. ranges

Dealer

~$150–$195

Shop

~$105–$135

DIY

~$20–$50

⚡

Spark Plugs (Sub-code 4)

Every 100,000 mi

Iridium plugs around 100,000 miles on most models. Turbocharged Integra/ADX engines: check the manual — forced induction typically shortens the interval.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

💨

Engine Air Filter (Sub-code 2)

Every 30,000 mi

Replace with sub-code 2, roughly every 30,000 miles — sooner in dusty conditions.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Recommended maintenance

Extends the life of your vehicle and improves comfort

🌬️

Cabin Air Filter (Sub-code 2)

Every 30,000 mi

Replace with sub-code 2 alongside the engine air filter. Behind the glovebox — an easy DIY on most Acuras.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

🌡️

Coolant Replacement (Sub-code 5)

Every 100,000 mi

Honda/Acura Type 2 coolant: first change around 10 years / 100,000 miles, then every 5 years / 50,000. Use the blue Type 2 coolant only.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2021 Acura Rdx.

Reported to NHTSA

Rear window glass shattering without impact

VISIBILITY/WIPER

17 NHTSA complaints · 2021-12 → 2026-04

“My car was parked in my driveway. After starting it up and closing my driver’s side door, the entire rear windshield spontaneously shattered without warning or any external manipulation/force. There was no way of knowing of whether or not this would happen…”
— Owner report, NHTSA ODI #11702676
“The contact's sister owns a 2021 Acura RDX. The contact stated that the rear glass had shattered while the vehicle was parked in the driveway. The dealer was contacted and advised that the earliest availability to replace the glass was in 3-4 days…”
— Owner report, NHTSA ODI #11710918
“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…”
— Owner report, NHTSA ODI #11444658

Read all complaints on NHTSA →

Panoramic sunroof glass shattering

UNKNOWN OR OTHER

8 NHTSA complaints · 2021-06 → 2026-03

“My sunroof exploded for no reason while traveling at highway speeds. Fortunately my sunshade was closed preventing shattered glass from entering the cabin which could have injured me…”
— Owner report, NHTSA ODI #11594354
“Brand new 2021 Acura RDX panoramic sunroof exploded less than 2 weeks after purchase. I was driving when all the sudden, out of nowhere, there was a loud pop/explosion sound. I immediately pulled over and inspected the but didn't find anything…”
— Owner report, NHTSA ODI #11420647
“The panoramic sunroof exploded on our Acura RDX model 2021. Me, my wife and our 3 month old son were returning from dinner, we took the ramp and about to merge on a highway then we heard a loud and sudden explosive noise which scared all of us…”
— Owner report, NHTSA ODI #11552681

Read all complaints on NHTSA →

Panoramic sunroof popping noise on chassis flex

STRUCTURE

8 NHTSA complaints · 2021-03 → 2025-12

“The panoramic sunroof makes popping sounds when I drive the car up or down ramps or curbs at angles that twists the chassis. This could potentially break and shatter the glass on top of the driver and passengers or worse dislodge from the mounting bracket…”
— Owner report, NHTSA ODI #11598342
“Panoramic sunroof has made popping noise when pulling into driveways 4/5 times within 3 weeks of owning vehicle. Have taken to dealer twice and they claim they cant replicate issue…”
— Owner report, NHTSA ODI #11590517
“While driving over a bump or curb to enter parking lot, I hear a popping noise coming from the sunroof at the front passenger and rear driver side of the car.”
— Owner report, NHTSA ODI #11668795

Read all complaints on NHTSA →

Engine power loss and limp mode during acceleration

ENGINE

14 NHTSA complaints · 2021-05 → 2025-01

“I was driving in the rain, accelerated to pass a vehicle and the engine lost power. The check engine light came on and the car went into "limp" mode. The car would barely go 40 mph on a highway and the speed seemed to be continuing to decrease…”
— Owner report, NHTSA ODI #11420614
“I own a 2021 Acura RDX that was purchased new in February 2021. In the 11,500 miles I have driven it, there have been zero problems until yesterday. However, yesterday, when driving on an Interstate highway at 70 mph, in the rain, while passing a semi truck…”
— Owner report, NHTSA ODI #11434152
“during acceleration on highway to pass a vehicle the Acura RDX lost power and decelerated. Check engine light came on....engine lost power to accelerate/maintain highway speed almost causing an accident.”
— Owner report, NHTSA ODI #11459776

Read all complaints on NHTSA →

Air bag seat weight sensor recall parts unavailable

AIR BAGS

13 NHTSA complaints · 2023-03 → 2025-06

“The contact owns a 2021 Acura RDX. The contact received notification of NHTSA Campaign Number: 24V064000 (AIR BAGS); however, the part to do the recall repair was unavailable…”
— Owner report, NHTSA ODI #11668941
“Acura RDX 2021.Faulty seat weight sensor front passenger seat. My wife is petite, [XXX] " and weighs [XXX]. When she sits in front passenger seat, at times, the seat weight sensor doesn't register that she's sitting in the seat and the air bag is not engaged…”
— Owner report, NHTSA ODI #11616293
“I have been trying to get my vehicle repaired for over a year in response to recall number 24V-064 with no success. The vehicle manufacturer is not providing the required parts to the dealership to address this recall from early 2024…”
— Owner report, NHTSA ODI #11643177

Read all complaints on NHTSA →

Automatic emergency braking with no obstacle

FORWARD COLLISION AVOIDANCE

4 NHTSA complaints · 2021-06 → 2022-08

“On 3 separate occasions my Collision mitigation braking system has malfunctioned. The first time I was driving at 55 with my cruise control set with no cars in front, behind or beside me when, without warning or reason, the orange brake light abruptly flashed…”
— Owner report, NHTSA ODI #11430610
“On May 9th we were driving on the freeway at around 3 pm on a sunlit clear day. It was a straight section of road. Dry pavement and traffic moving reasonably well…”
— Owner report, NHTSA ODI #11420161
“What component or system failed or malfunctioned? Car automatically applied brakes on several occasions, despite no obstacles in front of the car. Incident 1: While driving through an 3-way intersection, the car slammed on the brakes automatically…”
— Owner report, NHTSA ODI #11481593

Read all complaints on NHTSA →

SH-AWD transfer case fluid leak

POWER TRAIN

3 NHTSA complaints · 2025-11 → 2026-06

“The transfer case began leaking between the transmission and transfer case. Upon taking it to a mechanic I’ve been told the entire transfer case needs replacement because it has prematurely failed. The repair cost is $5533.00…”
— Owner report, NHTSA ODI #11697855
“A transmission fluid leak has been identified emanating from the passenger side output shaft seal, located between the transmission and the transfer case. This issue pertains to 2019–2023 Acura RDX and TLX models equipped with SH-AWD…”
— Owner report, NHTSA ODI #11746061
“I had found a leak coming from my 2021 Acura RDX early November. I took it into the dealership December 1st to get it diagnosed and they stated that the transmission and transfer case needs to get replaced…”
— Owner report, NHTSA ODI #11703819

Read all complaints on NHTSA →

Rear brake noise on braking and reversing

SERVICE BRAKES

4 NHTSA complaints · 2022-06 → 2024-12

“2021 Acura Rdx Sh-awd purchased brand new. Rear brakes squeak very bad. Have taken car back to the dealer and contacted Acura several times, but still have yet to receive any resolve/resolution. Brakes started squeaking very loud when car was moving @ low speeds…”
— Owner report, NHTSA ODI #11488883
“Rear brakes: Rear brakes and rotors make odd noise or extraordinarily high pitched screeching sounds coming from outside the car when your brakes are applied. When using brakes in reverse the noise is very load…”
— Owner report, NHTSA ODI #11510123
“I bought this car from a Honda dealership 1 month ago and my brakes are squeaking very loud when reversing my car. It happens every morning and is very frustrating. I would like this fixed for it being such an expensive car.”
— Owner report, NHTSA ODI #11630484

Read all complaints on NHTSA →

Issues on other model years

  • 2018 Acura Rdx →
  • 2019 Acura Rdx →
  • 2020 Acura Rdx →
  • 2022 Acura Rdx →
  • 2023 Acura Rdx →
  • 2024 Acura Rdx →

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Jul 27, 2026. Investigation data refreshed Jul 27, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2021 Acura Rdx reflects Acura's published service intervals and the Maintenance Minder system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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