2021 Honda Insight Problems: 4 Issues Every Owner Should Know

2021 model year · 0+ owner reports · Updated April 2026

According to Au7o's analysis of 0+ owner reports, the 2021 Honda Insight has 4 documented known issues, with 3 rated critical. The most serious are Fuel Pump Failure (NHTSA Recall) ($0-$0 repair), DC-DC Converter Shutdown (Loss of Drive Power) ($0-$0 repair) and IMA Hybrid Battery Failure (All Generations) ($400-$4,000 repair). Across all issues, repair costs range from $0 to $4,000. DIY maintenance guides at au7o.io.

All 4 Known Issues

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On the 2020-2021 Honda Insight, 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 electrical system warnings, loss of hybrid assist, and vehicle coming to a stop. Honda issued a recall/software update to fix the PCU software. Free repair at Honda dealers.

Common Symptoms

Loss of drive power while driving
Electrical system warning lights
12V battery not recharging
Hybrid system warnings
Vehicle shuts down or loses power
Battery discharge warnings

How to Fix

This is a SAFETY RECALL/TSB - contact Honda dealer to schedule free power converter unit (PCU) software update. The update fixes the DC-DC converter shutdown issue. Repair is free regardless of warranty status. If you experience loss of power while driving, pull over safely and contact Honda roadside assistance.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

NoteCRITICAL: Loss of drive power is a safety issue. Schedule repair immediately even if no symptoms.
TipSoftware update takes 30-60 minutes. Gen3Insight.com members report issue fully resolved after update.
UpgradeHigh-performance AGM battery with excellent cold cranking amps and deep cycle capability (Optima RedTop AGM Battery)
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UpgradeOEM-quality replacement battery with reliable performance (ACDelco Professional AGM Battery)
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UpgradeAutomatic battery maintainer to prevent parasitic drain issues during storage (Battery Tender Junior 12V Battery Charger Maintainer)
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Typical repair cost:$0 - $0

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Community Reported

Medium Confidence0 reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2000-2022 Honda Insight, all Honda Insight generations (2000-2006, 2010-2014, 2019-2022) experience IMA (Integrated Motor Assist) hybrid battery failures, typically between 75,000-175,000 miles (8-15 years). Symptoms include IMA warning light, reduced fuel economy, lack of electric assist, poor acceleration, and frequent battery recalibrations. The battery cells degrade over time, especially in hot climates. First and second generation batteries are more prone to failure. Third generation (2019-2022) batteries have better warranty coverage (8yr/100k miles in CARB states, 3yr/36k elsewhere). Replacement cost: $1,500-4,000 depending on generation.

This issue also affects: BMW 8 Series, BMW i3, BMW M3

Common Symptoms

IMA warning light on dashboard
Reduced fuel economy (MPG drops significantly)
Lack of electric motor assist during acceleration
Poor acceleration and sluggish performance
Battery gauge fluctuating or always empty
Frequent battery recalibrations
Check engine light with P1xxx hybrid codes

How to Fix

Options: (1) OEM Honda replacement battery ($2,500-4,000 installed), (2) Refurbished battery from specialist like Bumblebee Batteries or HybridReVolt ($1,200-2,000), (3) DIY battery rebuild ($400-800 in parts if mechanically skilled). For 3rd gen (2019-2022), check warranty coverage - 8yr/100k in CARB states (CA, NY, etc). InsightCentral.net forum has extensive guides on battery testing, reconditioning, and replacement. Some owners bypass IMA entirely and run as gas-only ($0-300) but lose hybrid benefits.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

UpgradeInsightCentral.net trusted rebuilders: Bumblebee Batteries ($1,500-1,800) and HybridReVolt ($1,200-2,000) - both offer warranties and have rebuilt 1,000+ Insight batteries.
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TipBattery doesn't "fail" instantly - slow charging/discharging gives warning weeks ahead. Monitor battery gauge and MPG for early detection.
NoteHot climates kill IMA batteries faster (Arizona, Texas, Florida). Parking in shade and avoiding extreme discharge extends life significantly.
TipDIY rebuild: Individual cells cost $5-10 each (20 cells total). InsightCentral has step-by-step guides - saves $2,000+ if mechanically inclined.

Typical repair cost:$400 - $4,000

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Community Reported

Medium Confidence0 reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2010-2022 Honda Insight, 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 uses a smaller 12V battery than other vehicles due to space constraints, and it's more sensitive to parasitic drain. Weak 12V battery can also trigger false IMA battery warnings.

Common Symptoms

No start condition
Clicking when trying to start
Electrical system warnings
Hybrid system errors (false warnings)
Battery dies after sitting overnight
Dim interior lights

How to Fix

Replace 12V battery with AGM battery (better than flooded) rated for hybrid vehicles ($150-250). Test for parasitic drain if battery keeps dying (normal is <50mA). Common causes of drain: trunk light staying on, aftermarket accessories, faulty BCM. Charge battery with low-amp charger (2-amp max) - high amp charging can damage hybrid system electronics.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

UpgradeGen3Insight.com top pick: Interstate or DieHard AGM batteries - last 5+ years vs OEM lasting 2-3 years. Worth the extra $50.
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NoteNEVER jump-start a hybrid - use proper jump points in fuse box (see manual). Jumping at battery terminals can damage hybrid electronics.
TipWeak 12V battery can cause false IMA battery warnings. Replace 12V first before assuming IMA battery is bad - saves $1,000s.

Typical repair cost:$150 - $250

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Community Reported

Medium Confidence0 reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2019-2022 Honda Insight, the 2019-2022 Honda Insight (third generation) has been recalled for fuel pump failures. The fuel pump impeller was improperly molded (low density), causing it to deform over time and interfere with the fuel pump body, rendering it inoperative. Symptoms include engine stalling while driving (especially highway speeds), rough idle, difficulty starting, and complete loss of power. Honda issued recall covering many 2019-2021 models. Free repair at Honda dealers - fuel pump module replacement.

This issue also affects: Chevrolet Silverado 2500HD, Jeep Grand Wagoneer, Lexus IS

Common Symptoms

Engine stalls while driving
Difficulty starting engine
Engine cranks but won't start
Rough idle or hesitation
Check engine light with fuel codes (P0087, P0230)
Loss of power during acceleration

How to Fix

This is a SAFETY RECALL - contact Honda dealer immediately to schedule free fuel pump module replacement. Check if your VIN is affected at https://www.honda.com/recall or call 1-888-234-2138. Repair is FREE regardless of mileage/warranty. If vehicle stalls while driving, pull over safely and contact Honda roadside assistance.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

NoteCRITICAL: Engine stalling at highway speeds is extremely dangerous. Schedule recall repair IMMEDIATELY even if no symptoms yet.
TipRecall was expanded multiple times - check your VIN even if you weren't affected initially. Gen3Insight.com forum tracks recall updates.
TipRepair takes 1-2 hours. Most dealers provide loaner since it's a safety recall.
UpgradeDelphi fuel pump module — OE-quality direct replacement (Delphi Fuel Pump Module)
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UpgradeBosch fuel pump — reliable OEM alternative (Bosch Fuel Pump)
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Typical repair cost:$0 - $0

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Community Reported

Medium Confidence0 reportsLast reported by owners Feb 2026Reviewed Feb 2026

Frequently Asked Questions

What are the most common Honda Insight problems?

According to Au7o's analysis of 0+ owner reports, the 2021-2021 Honda Insight has 4 documented issues. The most frequently reported are: Fuel Pump Failure (NHTSA Recall), DC-DC Converter Shutdown (Loss of Drive Power), IMA Hybrid Battery Failure (All Generations). Of these, 3 are rated critical and should be addressed promptly.

Is the Honda Insight reliable?

The 2021-2021 Honda Insight has 4 known issues documented across 0+ owner reports. 3 issues are rated critical: Fuel Pump Failure (NHTSA Recall) and DC-DC Converter Shutdown (Loss of Drive Power) and IMA Hybrid Battery Failure (All Generations). 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 $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Fuel Pump Failure (NHTSA Recall), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019-2022 Honda Insight Fuel Pump Failure (NHTSA Recall)?

The 2019-2022 Honda Insight (third generation) has been recalled for fuel pump failures. The fuel pump impeller was improperly molded (low density), causing it to deform over time and interfere with the fuel pump body, rendering it inoperative. Symptoms include engine stalling wh… Repairs typically run $0-$0. Severity: high.

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 2000-2022 Honda Insight IMA Hybrid Battery Failure (All Generations)?

All Honda Insight generations (2000-2006, 2010-2014, 2019-2022) experience IMA (Integrated Motor Assist) hybrid battery failures, typically between 75,000-175,000 miles (8-15 years). Symptoms include IMA warning light, reduced fuel economy, lack of electric assist, poor accelerat… Repairs typically run $400-$4,000. 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.

2021 Honda Insight Problems: 4 Issues Every Owner Should Know

All 4 Known Issues

2020-2021 Honda Insight: DC-DC Converter Shutdown (Loss of Drive Power)#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2000-2022 Honda Insight: IMA Hybrid Battery Failure (All Generations)#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2010-2022 Honda Insight: 12V Battery Premature Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2019-2022 Honda Insight: Fuel Pump Failure (NHTSA Recall)#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

Other Honda Models

Frequently Asked Questions

What are the most common Honda Insight problems?

Is the Honda Insight reliable?

How much does it cost to fix common Honda Insight problems?

What is the 2019-2022 Honda Insight Fuel Pump Failure (NHTSA Recall)?

What is the 2020-2021 Honda Insight DC-DC Converter Shutdown (Loss of Drive Power)?

What is the 2000-2022 Honda Insight IMA Hybrid Battery Failure (All Generations)?

What is the 2010-2022 Honda Insight 12V Battery Premature Failure?