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2021 Honda Insight Recalls, Issues & Maintenance

The 2021 Honda Insight carries 3 open NHTSA recalls — most recently covering dc/dc converter and front passenger. Owners report 6 recurring issue clusters, led by “Automatic emergency braking activation with no obstacle.” Honda vehicles use the Maintenance Minder system — your dashboard displays a Code A (oil change) or Code B (oil change plus inspections) along with sub-codes 1-6 for additional services. Intervals adjust based on how you drive. The schedule below reflects Honda's underlying targets.

3 Open Recalls

Source: NHTSA

ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER

Campaign #20V798000 · Dec 17, 2020

Issue: Honda (American Honda Motor Co.) is recalling certain 2020 CR-V Hybrid, Accord Hybrid, and 2020-2021 Insight vehicles. The DC-DC converter may shut down and prevent the 12-volt battery from recharging, possibly resulting in a loss of drive power.

Risk: A loss of drive power can increase the risk of a crash.

Fix: Honda will notify owners, and dealers will update the power converter unit (PCU) software, free of charge. The recall began February 12, 2021. Owners can contact Honda customer service at 1-888-234-2138. Honda's number for this recall is K9E.

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 Sep 6, 2026.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2021 Honda Insight.

1 active NHTSA investigation

Source: NHTSA

  • Inadvertent Automatic Emergency Braking

    Action #EA25002 · opened Jan 17, 2025

    On March 7, 2024, the Office of Defects Investigation (ODI) opened a Preliminary Evaluation (PE24008) to assess reports of inadvertent activation of the Automatic Emergency Braking (AEB) system in model year 2019-2022 Honda Insight and 2019-2022 Honda Passport vehicles. The compl…

    View on NHTSA →

Reported to NHTSA

Automatic emergency braking activation with no obstacle

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING, FORWARD COLLISION AVOIDANCE: WARNINGS

7 NHTSA complaints · 2021-07 → 2025-07

“I have had 6 times where the collision warning has slammed on the brakes when there is no vehicles on the road in front of me. This is very dangerous when vehicles are behind you”
— Owner report, NHTSA ODI #11461413
“On two (2) occasions, the "collision mitigation braking system" braked with no reason. It has happened on a quiet and straight line residential street with no other moving vehicle, pedestrian, animal, or any other obstruction in view”
— Owner report, NHTSA ODI #11675632

Read all complaints on NHTSA →

Adaptive cruise control braking on exiting lead vehicle

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

3 NHTSA complaints · 2022-06 → 2023-04

“However if the vehicle in front enters an exit lane and slows, my car is slowed to the point that the brakes are fully applied, causing vehicles behind me slam on their brakes or swerve to avoid rear-ending me. The ACC does not "let go" of the car in front of me”
— Owner report, NHTSA ODI #11470044
“On multiple occasions while driving at 60 mph in the right hand lane with ACC controlling the distance to the vehicle in front of me, the vehicle in front moved to the exit lane clearing the path in front of me. As the exiting vehicle slowed in the exit lane, the ACC applied the…”
— Owner report, NHTSA ODI #11515959

Read all complaints on NHTSA →

Seat weight sensor recall repair parts unavailability

SEATS, AIR BAGS, UNKNOWN OR OTHER

3 NHTSA complaints · 2024-06 → 2025-12

“I received the "important safety recall" letter in March 2024 from the Honda Automobile Division regarding the seat weight sensor circuit board. The letter said that in a crash, the airbags could deploy in a dangerous fashion. I have called my Honda dealer three times since…”
— Owner report, NHTSA ODI #11613881
“I received a 2021 Insight Seat Weight Sensor Safety Recall in September 2025 saying that recall replacement parts were now available at Honda Dealers. Ever since I received this notice, none of the Atlanta area Honda dealers are able to remedy the defect in my vehicle due to…”
— Owner report, NHTSA ODI #11707122

Read all complaints on NHTSA →

Brake servo control unit and pedal simulator failure

SERVICE BRAKES

3 NHTSA complaints · 2021-01 → 2025-11

“My safety has been put at risk as that part is integral to my brake system (including the hybrid function) e.g. my car was in reverse and the brakes were not responding and had to leave my car. I towed my car to a local independent service provider and they confirmed via the…”
— Owner report, NHTSA ODI #11699002
“While my wife was driving my car on a busy road. The servo brake control unit/ pedal simulator broke making it near impossible to stop the car. She had to crash the car into a parking block”
— Owner report, NHTSA ODI #11696866

Read all complaints on NHTSA →

Power Control Unit malfunction with loss of drive and braking

ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL, POWER TRAIN

2 NHTSA complaints · 2021-02 → 2025-11

“AS I WAS DESCENDING A HILL, THE TRANSMISSION SHUT OFF. I WAS ABLE TO COAST TO A STOP WITH SOME BRAKING. THE CAR WAS TOWED TO FLOW HONDA IN WINSTON-SALEM, NC, WHERE THEY REPLACED THE PCU”
— Owner report, NHTSA ODI #11395655
“Under certain circumstances, the portion of the PCU that controls charging of the 12 volt accessory battery malfunctions, sending the PCU into a "fail safe" mode, preventing battery charging and activating warning displays for the driver. This has caused my vehicle to stall…”
— Owner report, NHTSA ODI #11701339

Read all complaints on NHTSA →

Air bag deployment anomalies

AIR BAGS

2 NHTSA complaints · 2021-07 → 2026-06

“The contact stated that while her daughter was driving at an undisclosed speed, the front driver's and passenger-side air bags suddenly deployed without impact. There was no warning light illuminated. The contact stated that the air bags cracked the front windshield and injured…”
— Owner report, NHTSA ODI #11742632
“The contact stated while driving at 55 mph, a deer jumped in front of the vehicle causing the contact to hit the deer but none of the air bags deployed. The contact mentioned that the automatic brakes were engaged during the incident”
— Owner report, NHTSA ODI #11424785

Read all complaints on NHTSA →

Note: NHTSA also opened 2 defect investigation(s) on this vehicle that closed without action.

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 11, 2026. Investigation data refreshed Sep 11, 2026.

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

Essential maintenance

Critical for safety and preventing major damage

Engine Oil & Filter (Code A)

Every 7,500 mi

Replace 0W-20 full-synthetic oil and filter. The Maintenance Minder triggers Code A between 7,500 and 10,000 miles depending on driving conditions.

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.

Tire Rotation (Sub-code 1)

Every 7,500 mi

Rotate tires front-to-back to even out wear. Honda triggers Sub-code 1 alongside every other oil change.

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 (Code B)

Every 15,000 mi

Inspect brake pads, rotors, and parking brake. Code B includes a multi-point inspection of brakes, suspension, and fluids.

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 (Sub-code 5)

Every 45,000 mi

Replace DOT 3 brake fluid every 3 years regardless of mileage to prevent moisture absorption and corrosion of ABS components.

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

Automatic Transmission / CVT Fluid (Sub-code 3)

Every 30,000 mi

Replace ATF or CVT fluid. Honda CVT models (Civic, HR-V, Accord LX) use Honda HCF-2 — do not substitute. The Maintenance Minder triggers earlier under heavy stop-and-go.

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.

Rear Differential Fluid (AWD models, Sub-code 5)

Every 30,000 mi

AWD CR-V, Pilot, Passport, Ridgeline: replace rear diff fluid every 30,000 miles, sooner if towing.

Estimated cost — typical U.S. ranges

Dealer

~$150–$195

Shop

~$105–$135

DIY

~$20–$50

Drain plug + fill plug — straightforward DIY. AWD vehicles have two; budget for both.

Engine Air Filter (Sub-code 4)

Every 30,000 mi

Replace the engine air filter every 30,000 miles. Honda uses a long-life cellulose element on most port-injected engines.

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.

Spark Plugs (Sub-code 6)

Every 105,000 mi

Honda uses iridium-tipped plugs rated for 100,000+ miles. Replace at 105,000 miles or whenever Sub-code 6 displays.

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 Coolant (Sub-code 5)

Every 60,000 mi

Honda Long-Life Type 2 (blue) coolant: first change at 120,000 miles, then every 60,000 miles. Do not mix with other coolant types.

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.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Cabin Air Filter (Sub-code 3)

Every 15,000 mi

Replace the cabin air filter — accessible behind the glove box on most Hondas. Honda recommends 15,000 miles in dusty conditions, longer in clean climates.

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.

Valve Clearance Adjustment (Sub-code 6)

Every 105,000 mi

Inspect and adjust valve clearances at 105,000 miles. Critical on K-series and L-series engines to prevent valve recession.

Estimated cost — typical U.S. ranges

Dealer

~$495–$535

Shop

~$345–$375

DIY

Pro only

Mechanical-bucket valvetrains (many Honda 4-cyls, older Toyotas) need this. Hydraulic lifters don't. Shop work — feeler-gauge precision required.

Timing Chain — No Replacement

On condition / lifetime

Modern Honda engines (K-series, L-series, R-series, plus all Earth Dreams 1.5T and 2.0T) use a timing chain designed to last the life of the engine. No scheduled replacement.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Pro only

Timing chains are normally lifetime. Listen for rattle on cold start — that's the actionable signal. Replacement is major work, quote separately.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

3 crashes 2010–2024

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

1

complaints mentioning a crash

0

complaints mentioning a fire

Reviewed known issues for this vehicle·Open recalls for this 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 Honda Insight reflects Honda'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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