2021 Honda Insight Problems: 2 Known Issues
2021 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated October 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Honda Insight has 2 documented known issues, with 1 rated critical. The most serious is DC-DC Converter Shutdown (Loss of Drive Power) ($0-$0 repair). Across all issues with published estimates, repair costs range from $150 to $250. DIY maintenance guides at au7o.io.
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All 2 Known Issues
NHTSA Recalls14 recalls
SEAT BELTS:REAR/OTHER:RETRACTOR
Honda (American Honda Motor Co.) is recalling certain 2021 Accord Sedan, Accord Hybrid, CR-V, Ridgeline, 2022 Insight and CR-V Hybrid vehicles. The automatic locking retractor on the second-row center seat belt assembly may deactivate improperly, which can result in an unsecured child restraint system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX, RLX, TLX, 2019-2022 Honda Insight, Passport, 2020 Honda CR-V Hybrid, 2018-2019 Honda Clarity PHEV, Fit, and 2015-2020 Honda Accord Hybrid, Pilot, Acura NSX vehicles. The fuel pump inside the fuel tank may fail.
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
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.
ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER
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.
AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
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.
+ 9 more recalls. Check all on NHTSA.gov
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Frequently Asked Questions
What are the most common Honda Insight problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 Honda Insight has 2 documented issues. The most frequently reported are: DC-DC Converter Shutdown (Loss of Drive Power), 12V Battery Premature Failure. Of these, 1 is rated critical and should be addressed promptly.
Is the Honda Insight reliable?
The 2021 Honda Insight has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: DC-DC Converter Shutdown (Loss of Drive Power). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Honda Insight problems?
Repair costs for known Honda Insight issues range from $0 to $250, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, DC-DC Converter Shutdown (Loss of Drive Power), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020-2021 Honda Insight DC-DC Converter Shutdown (Loss of Drive Power)?
The 2020-2021 Honda Insight experiences DC-DC converter shutdowns that prevent the 12-volt battery from recharging, resulting in loss of drive power. The power converter unit (PCU) software has a defect that causes the DC-DC converter to shut down unexpectedly. Symptoms include e… Repairs typically run $0-$0. Severity: high.
What is the 2010-2022 Honda Insight 12V Battery Premature Failure?
Honda Insight models (especially 2010-2014 and 2019-2022) experience premature 12V battery failures. The small 12V battery (not the IMA hybrid battery) dies unexpectedly, often within 2-3 years. Symptoms include no start, electrical gremlins, and hybrid system errors. The Insight… Repairs typically run $150-$250. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.