2016-2021 Honda Civic: Reliability Guide

Reliability Guide for the Honda Civic (2016–2021)

Important data note

• Data snapshot: The provided NHTSA data for 2016–2021 Civics includes a single owner complaint:
  • Year: 2016
  • Component: Transmission
  • Mileage: 25,911 miles
  • OBD Code: P0455
  • Description: “Vehicle experiencing fuel economy issues with code P0455. The transmission appears to be malfunctioning. Issue occurs intermittently during highway driving. Dealer unable to diagnose root cause after multiple visits.”
• Recalls: No recalls found in NHTSA database for this make/model (as per the data provided).

How to read this guide

• This guide uses the provided complaint data to illustrate reliability signals. With only one documented complaint across six model years (2016–2021), the dataset is not large enough to draw strong reliability conclusions for the Civic in this period.
• Where the data is sparse, the guide relies on general automotive knowledge to explain likely causes and practical maintenance steps. All cost estimates for 2025 are forward-looking estimates and can vary by location, shop, and vehicle condition.

Quick takeaways

• Data-driven reliability signal: Very limited. One listed complaint (2016 Civic) does not establish a robust reliability trend for the 2016–2021 Civic lineup.
• Recalls: None reported in the provided data (no recalls found).
• The only recorded issue involves a P0455 EVAP code paired with a stated transmission concern, with inconclusive root-cause diagnosis by the dealer. P0455 typically points to a large evaporative system leak, not a confirmed transmission fault. However, the owner’s description notes intermittent highway-drive issues attributed to the transmission.
• Practical takeaway: If you own a 2016–2021 Civic, use this guide as a framework for proactive maintenance and diagnostic steps, especially around EVAP and transmission health, rather than as a predictor of common failure modes.

About the 2016–2021 Honda Civic (generational context)

• Model span: 10th generation Civics produced from 2016 through 2021.
• Engine options: Common configurations include 1.5L turbocharged engines (in most trims) and 2.0L naturally aspirated engines (in some trims). Hybrid options exist in some model years, depending on market.
• Transmission options: Typically CVT (continuously variable transmission) with the 1.5L turbo, plus 6-speed manual on select trims. Some complaints in this generation historically focus on CVT behavior (judder, harsh shifts, or reliability concerns) in certain mileage ranges, though this specific dataset contains only one EVAP-related complaint.
• General reliability notes (based on common knowledge for this generation): Civics of this era are widely praised for overall reliability and efficiency, with routine maintenance being the primary driver of long-term durability. Evaporative (EVAP) system problems and CVT-related concerns are among the more frequently discussed maintenance topics in owner communities, especially as mileage increases.

What the dataset shows for this generation (and how to interpret it)

• Complaint count: 1 noted in the provided data (2016 Civic).
• Reported issue: Transmission-related symptoms and a P0455 code (EVAP large leak) with highway drivability concerns, unresolved root-cause diagnosis after multiple dealer visits.
• Interpretation caveat: A single data point cannot establish a reliability trend. It does, however, highlight two areas you may want to monitor in your own Civic ownership: EVAP system integrity and CVT/transmission health, especially if you observe fuel economy changes or drivetrain slipping/judder.

Common issues to watch for (based on both the dataset and general Civic experience)

• EVAP system (P0455 and related codes)
  • Likely causes: Gas cap not sealing properly, cracked/loose EVAP hoses, damaged purge valve or vent valve, or a leak in the charcoal canister.
  • Symptoms: Check engine light, reduced fuel economy, rough idle (in some cases), or difficult-to-diagnose vacuum leaks.
  • Quick checks you can perform:
    • Ensure gas cap is tightened until it clicks; inspect the cap and threads for damage.
    • Visually inspect EVAP hoses for cracks or disconnections, especially around the purge valve and near the engine bay.
    • If the light persists after the cap is reseated, a diagnostic bleed/smoke test by a qualified shop is often needed to pinpoint leaks.
• Transmission (CVT) health (commonly discussed for this generation)
  • Known concerns (in broader Civic experience, not specifically proven by this dataset): CVT wear, judder, slipping, or harsh/late engagement wear as mileage climbs; proper maintenance is crucial.
  • Maintenance focus: Regular CVT fluid checks/changes per Honda recommendations; using the correct Honda CVT fluid; avoiding contaminating fluids.
  • Signs that warrant inspection: Transmission noise, shudder or bucking, slipping, slipping into or out of gear, or abnormal transmission-related warning lights.

Maintenance and preventive care (practical, maintenance-focused guidance)

• General maintenance cadence (guidance for 2016–2021 Civics; verify with owner’s manual for your exact VIN/trims)
  • Oil changes: roughly every 5,000–7,500 miles (or per your owner’s manual). Use recommended oil grade and change interval.
  • Tire maintenance: rotate every 5,000–7,500 miles; ensure alignment and tire pressure are within spec to maximize fuel economy and drivability.
  • Brakes: inspect pads and rotors at least every 12,000–15,000 miles; replace as needed.
  • CVT maintenance: follow Honda’s recommended interval for CVT fluid inspection/replacement (often around 60,000 miles for many Civics, but verify your specific variant). Use dedicated Honda CVT fluid.
  • EVAP system: periodic checks during routine service; address any CEL (check engine light) codes promptly.
• Recommended preventive checks to minimize EVAP and transmission issues
  • Gas cap condition: Replace if cross-threaded, cracked, or not sealing properly.
  • EVAP hose routing and connections: Inspect for cracking or disconnections, especially in cold climates where hoses may become stiff.
  • Purge/vent valves: If the EVAP system code persists, have purge valve and vent valve tested; faulty valves can cause P0455-like symptoms.
  • Transmission fluid: Check level and look for burnt smell or dark color; replace as per service schedule or if recommended by a technician.
  • Software updates: Some issues are helped by software updates from Honda; verify with a dealer if any TSB/updates exist for your VIN (not listed in your dataset).

Practical diagnostic steps if you encounter P0455 or a suspected EVAP/transmission issue

• Step 1: Read codes with a reliable OBD-II scanner to confirm P0455 or identify additional codes.
• Step 2: Verify gas cap condition
  • Retighten the cap and inspect for damage; replace if faulty. Cost: typically $15–$40 for a replacement cap; installation is usually free if done at home.
• Step 3: Inspect EVAP components
  • Visually inspect hoses, connections, purge valve, vent valve, and canister for obvious damage or disconnections.
  • If no obvious issues, a professional smoke test can identify leaks not visible to the eye.
• Step 4: Check for related powertrain codes
  • If other codes appear, diagnose those in parallel (e.g., misfire, sensor faults) to avoid chasing EVAP-only symptoms when other issues exist.
• Step 5: If transmission symptoms accompany the EVAP code
  • Check CVT fluid level and condition (color, odor). Low or burnt fluid can indicate internal transmission concerns or leaks.
  • If CVT concerns are suspected, a qualified technician may perform a CVT fluid flush/replacement per manufacturer guidelines.
• Step 6: Decide on repair path
  • If EVAP leak is confirmed, repair may involve hose replacement, purge valve, or canister replacement depending on the leak location and severity.
  • If CVT-related symptoms persist after EVAP issues are addressed, consult a transmission specialist or Honda dealership for a more comprehensive transmission diagnosis.

2025 cost estimates for common repairs (order of magnitude, typical ranges)

Note: Prices vary by region, shop, vehicle condition, and whether OEM or aftermarket parts are used. All figures are rough ranges in 2025 dollars.

• EVAP system
  • Gas cap replacement: $15–$40 (part only)
  • EVAP hoses or lines repair: $50–$300 (parts and labor)
  • EVAP purge valve replacement: $180–$350 (parts); labor $50–$150
  • EVAP canister replacement: $400–$800 (parts); labor $200–$400
  • EVAP system diagnostic/smoke test: $50–$150 (if performed at independent shop)
• Transmission (CVT)
  • CVT fluid change/flush: $150–$250 (labor + fluid)
  • CVT fluid replacement (OEM fluid recommended): often included in the above; if done at dealership, expect toward the upper end
  • CVT repair or rebuild: $2,000–$4,500 (depends on extent and labor)
  • CVT replacement (new or remanufactured unit): $3,000–$5,000+ (labor and parts)
  • Transmission diagnostics (labor): $100–$200 depending on shop
• Routine maintenance (annualized perspective)
  • Oil change and filter: $40–$90 (independent shop) or higher at dealership
  • Tire rotation/balance: $20–$50
  • Brake service (pads/rotors as needed): $150–$350 per axle for pads; rotors extra
• Other potential costs (if related issues arise)
  • Software updates (dealer): often complimentary or minimal if under warranty; otherwise $50–$150
  • Labor rates: vary by region; typical shop rates range from $100–$180 per hour at independent shops, higher at dealers

How to maximize reliability and value in a 2016–2021 Civic

• Stay within maintenance intervals for CVT fluid and engine oil. Use the manufacturer’s recommended fluids and stay current with software updates when available.
• Address EVAP-related codes promptly to prevent fuel economy loss and potential emissions-related penalties.
• If you notice drivetrain symptoms (noise, shift feel, or hesitation) or a persistent CEL with P0455 or related codes, seek diagnostic service sooner rather than later.
• Maintain tires with proper inflation and alignment; this helps with efficiency and drivability, which indirectly supports reliability.
• Keep a detailed maintenance log (dates, mileage, services, and parts) to assist future diagnostics and preserve resale value.

Warranty and support considerations (general guidance)

• For Civics from this era, typical new-car warranty coverage includes:
  • Basic (bumper-to-bumper): around 3 years / 36,000 miles
  • Powertrain: around 5 years / 60,000 miles
  • Emissions control and EVAP-related components often have coverage under the powertrain or separate emissions warranties, depending on the year and market
• If you’re purchasing a used Civic, check current warranty status and any extended warranty options or certified pre-owned programs. Warranty coverage can influence repair decisions and out-of-pocket costs for EVAP or CVT-related issues.

Data limitations and transparency

• The reliability assessment here is constrained by a single documented complaint in the provided data. No recalls were listed in the dataset. This means the guide should be taken as a practical framework for maintenance and diagnostics rather than a robust reliability metric for the entire 2016–2021 Civic lineup.
• For a comprehensive reliability view, consult broader sources that cover larger sample sizes and additional years, trims, and regional data.

Appendix: Key terms

• P0455: A code indicating a large EVAP (evaporative emissions) system leak, suggesting either a gas cap issue, hose/valve leak, or EVAP canister problem.
• EVAP: Evaporative Emission Control System, designed to prevent fuel vapors from escaping into the atmosphere.
• CVT: Continuously Variable Transmission, which uses a belt/torque-converter design to provide seamless gear ratios and can have different maintenance requirements than conventional automatic transmissions.

If you’d like, I can tailor this guide to your specific Civic trim (model year, engine, and transmission) and provide a customized maintenance calendar, plus a more precise 2025-cost projection based on your location.