Honda · Known Issues
2021 Honda Civic Problems: 20 Known Issues
2021 model year · 5,325+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2021 model year · 5,325+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 5,325+ owner reports, the 2021 Honda Civic has 20 documented known issues, with 3 rated critical. The most serious are Type R Brake Fade and Fluid Boiling on Track (Stock Brakes) ($150-$600 repair), 1.5T Turbo Engine Coolant Intrusion Into Cylinders / Head Gasket Degradation (Class Action) ($1,500-$8,000 repair) and Brake Master Cylinder Separation — Loose/Missing Booster Tie-Rod Nuts (Recall 23V-458) ($0-$600 repair). The most commonly reported issue is 1.5T Earth Dreams Direct Injection Carbon Buildup on Intake Valves with 891 owner reports. Across all issues with published estimates, repair costs range from $20 to $8,000. DIY maintenance guides at au7o.io.
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
Honda (America Honda Motor Co.) is recalling certain 2023 Civic, Acura RDX, Acura Integra, and 2022 Honda Accord vehicles. A ball valve in the vehicle stability assist (VSA) modulator may leak brake fluid, which can result in unintended vehicle movement when the brake hold feature is engaged or an unexpected increase in brake pedal travel.
STEERING:RACK AND PINION
Honda (American Honda Motor Co.) is recalling certain 2022-2024 Civic 4-door and Civic 5-door vehicles that received a replacement power steering rack as part of a service repair. The steering rack may have been incorrectly assembled, which can allow the tire to chafe against the lower suspension or tie rod end, possibly resulting in tire damage.
STEERING
Honda (American Honda Motor Co.) is recalling certain 2023-2025 Acura Integra, Civic Type R, CR-V Hybrid, CR-V, HR-V, 2022-2025 Civic, Civic Hatchback, 2024-2025 Acura Integra Type S, 2025 CR-V Fuel Cell EV, Civic Hybrid, and Civic Hatchback Hybrid vehicles. The steering gearbox assembly may have been manufactured incorrectly, which can cause excessive internal friction and lead to difficulty steering the vehicle.
SEATS:CRITICAL FASTENERS
Honda (American Honda Motor Co.) is recalling certain 2023-2024 Honda Accord, Accord Hybrid, Civic Sedan, Civic Hatchback, Pilot, and 2024 HR-V, Acura Integra and Acura Integra Type S vehicles. The driver's seat cushion frame may not have been tightened properly, which can result in an unsecured seat. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 207, "Seating Systems."
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Honda (American Honda Motor Co.) is recalling certain 2023-2024 Honda Accord, Accord Hybrid, 2023-2025 Honda CR-V Hybrid, and 2025 Honda Civic and Civic Hybrid vehicles. The high-pressure fuel pump may crack and leak fuel.
+ 4 more recalls. Check all on NHTSA.gov
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According to Au7o's analysis of 5,325+ owner reports, the 2021 Honda Civic has 20 documented issues. The most frequently reported are: Type R Brake Fade and Fluid Boiling on Track (Stock Brakes), 1.5T Turbo Engine Coolant Intrusion Into Cylinders / Head Gasket Degradation (Class Action), Brake Master Cylinder Separation — Loose/Missing Booster Tie-Rod Nuts (Recall 23V-458). Of these, 3 are rated critical and should be addressed promptly.
The 2021 Honda Civic has 20 known issues documented across 5,325+ owner reports. 3 issues are rated critical: Type R Brake Fade and Fluid Boiling on Track (Stock Brakes) and 1.5T Turbo Engine Coolant Intrusion Into Cylinders / Head Gasket Degradation (Class Action) and Brake Master Cylinder Separation — Loose/Missing Booster Tie-Rod Nuts (Recall 23V-458). 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.
Repair costs for known Honda Civic issues range from $0 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Type R Brake Fade and Fluid Boiling on Track (Stock Brakes), typically costs $150-$600 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The FK8 and FL5 Civic Type R stock Brembo brake calipers with 350mm front rotors are adequate for street use but suffer brake fade after 2-3 laps on a circuit. The stock brake fluid (Honda Ultra Brake Fluid) has a wet boiling point of only 284°F, which is quickly exceeded on trac… Repairs typically run $150-$600. Severity: high.
A class-action lawsuit (filed in U.S. and Canadian courts) alleges the turbocharged 1.5L i-VTEC engine cannot properly manage the added compression and heat, so engine coolant seeps through grooves in the cylinder head, degrades the head gasket, and leaks INTERNALLY into the comb… Repairs typically run $1,500-$8,000. Severity: high.
On affected Civics the brake master cylinder may not have been securely fastened to the brake booster during assembly, leaving loose or missing tie-rod nuts inside the booster assembly. Pressing the brake pedal then puts a bending load on the booster tie-rod studs, which can brea… Repairs typically run $0-$600. Severity: high.
The 1.5L turbocharged Earth Dreams direct-injection engine (L15B7) accumulates heavy carbon deposits on intake valves and ports because fuel is injected directly into the cylinder, bypassing the intake valves. Unlike port-injection engines, no fuel washes the intake valves clean. Repairs typically run $300-$800. Severity: medium.
The A/C compressor can fail, particularly on vehicles in hot climates or those with high A/C usage. When the compressor fails internally, it can contaminate the entire A/C system with debris, requiring extensive repairs. Repairs typically run $600-$1,800. Severity: medium.
The CVT transmission can develop a shudder or judder, particularly during light acceleration from a stop or at low speeds. This vibration can feel like driving over rumble strips and is often related to the torque converter or CVT fluid degradation. Repairs typically run $150-$3,000. Severity: medium.
The Honda Sensing driver assist system can experience false alerts and phantom braking, particularly with the adaptive cruise control and collision mitigation. The system may brake unexpectedly when no obstacle is present or fail to detect vehicles ahead. Repairs typically run $0-$500. Severity: medium.
The 1.5L turbo Civic experiences premature failure of the turbocharger coolant feed and return hoses, and the oil feed/return lines. The banjo bolt sealing washers (crush washers) on the oil feed line compress and leak over time, causing slow oil loss near the turbo. The coolant… Repairs typically run $100-$1,400. Severity: medium.
The FK8 and FL5 Civic Type R uses a Torsen-style mechanical limited slip differential (LSD) that produces chattering, grinding, or clicking sounds during low-speed turns, especially in parking lots and during U-turns. This is inherent to LSD operation but becomes problematic when… Repairs typically run $100-$1,500. Severity: medium.
10th-gen Civics commonly lose A/C cooling because the factory condenser was not manufactured to specification: tiny corrosion holes form in the condenser tube walls and slowly leak refrigerant, so the A/C blows warm or only mildly cool air. The problem is widespread enough that H… Repairs typically run $0-$900. Severity: medium.
The 10th-generation Civic's air-conditioning system, which uses the newer R-1234yf refrigerant, is prone to refrigerant leaks from two points. Condensers built out of spec corrode and develop pinhole leaks in the tube walls, and the A/C compressor shaft seal wears abnormally and… Repairs typically run $0-$2,000. Severity: medium.
Owners across 10th- and 11th-gen Civics report the windshield chips and cracks far too easily — from tiny pebbles, temperature changes, or with no apparent impact at all (cracks starting at the edge/seal). The modern thinner laminated glass (lighter and designed around the Honda… Repairs typically run $300-$1,500. Severity: medium.
Early FK8 Civic Type R 6-speed manuals can exhibit a crunch/grind when shifting into 3rd gear — most noticeable on fast upshifts or when the gearbox oil is cold — caused by premature wear of the 3rd-gear synchromesh ring. Some owners also report 3rd/4th-gear failures under hard t… Repairs typically run $700-$3,000. Severity: medium.
The Honda infotainment system can experience lag, freezing, and unresponsive touchscreen inputs. The volume knob may be slow to respond, and the system can reboot randomly. CarPlay/Android Auto connections can be unstable. Repairs typically run $0-$1,000. Severity: low.
Many Civic owners report squealing or grinding noise from the rear brakes, often during light braking or when brakes are cold. This can occur even with adequate pad thickness and is often related to the pad compound or rotor surface condition. Repairs typically run $50-$400. Severity: low.
A clunking or rattling noise from the front suspension when going over bumps is common. This can be caused by worn stabilizer bar end links, strut mounts, or control arm bushings. The issue may be more noticeable on rough roads. Repairs typically run $80-$400. Severity: low.
P0442 sets when the Civic's PCM runs its EVAP self-test and detects a small leak (roughly 0.020-0.040 in). On the Civic the overwhelmingly most common source is the fuel-filler cap: the rubber O-ring on the cap hardens and shrinks with age/heat and stops sealing, which is why a P… Repairs typically run $20-$300. Severity: low.
The 7-inch Display Audio head unit in the 10th-gen Civic suffers from chronic software bugs: the screen freezes, goes black, flickers, or spontaneously reboots, frequently taking the backup camera, LaneWatch, Bluetooth audio, and Apple CarPlay/Android Auto down with it. Apple Car… Repairs typically run $0-$1,500. Severity: low.
Civics with the premium/Touring audio system (rear-deck subwoofer) develop a loud plastic rattle/buzz during bass-heavy music even at moderate volume. The plastic rear-deck/parcel-shelf trim and the panel behind the subwoofer vibrate against the rear glass and third-brake-light h… Repairs typically run $0-$150. Severity: low.
P0455 indicates a large (gross) leak in the evaporative emission system — the PCM cannot build or hold EVAP vacuum/pressure at all. On the Honda Civic the two most frequent causes are strikingly simple: a gas cap that no longer seals (missing, loose, or a badly degraded O-ring) a… Repairs typically run $30-$350. Severity: low.
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.