P0455 Code: Honda CR-V (2017-2023) - Causes, Symptoms & Fixes

No recalls found in NHTSA database

Note on data: The provided NHTSA data for the 2017-2023 Honda CR-V shows no owner complaints and no official recalls for this issue. This guide relies on general EVAP system knowledge and common CR-V behavior for P0455. Actual vehicle behavior can vary; use this as a diagnostic and planning reference, not a guaranteed repair protocol.

CODE MEANING AND SEVERITY

• Code P0455: Evaporative Emission Control System Large Leak Detected.
• What it means: The vehicle’s evaporative emissions system has a leak large enough that the onboard diagnostic monitors have detected a leak well beyond normal tolerances. The system is designed to keep fuel vapors from escaping to the atmosphere; a large leak can trigger the MIL (Check Engine) light and may cause reduced fuel efficiency and emissions failures.
• Severity on a CR-V: Moderate to High. A large leak is more likely to set a MIL and cause emissions-related drive-cycle failures. If left unresolved, it can lead to frequent check-engine illumination and potential failing an emissions test. The actual drivability impact (rough running or stalling) is usually minimal unless another fault is present; the most common effect is vapors escaping or a constant MIL.

COMMON CAUSES ON HONDA CR-V (2017-2023)

• Loose or faulty gas cap (most common first check).
• Damaged, cracked, or mis-sealed fuel filler neck or vacant cap seal area.
• Leaking or cracked EVAP hoses and vacuum lines near the fuel system or canister.
• Faulty EVAP purge valve (solenoid) or EVAP vent valve stuck open/closed.
• Leaking or failed charcoal canister (EVAP canister).
• Damaged or leaking fuel vapor canister vent hose or connections.
• Wiring or connector issues to the purge/vent valves or pressure sensor (less common but possible).
• Aftermarket modifications or accidental damage during service (hoses pinched, clamps loose).

SYMPTOMS

• Check Engine Light (MIL) on or flashing.
• Fuel odor or strong gasoline smell, especially around the rear of the vehicle or near the fuel filler area.
• Possible decrease in fuel economy due to evaporative system diagnosis taking longer to pass.
• In some cases, no noticeable driveability issue; the car may run normally aside from the illuminated MIL.
• After refueling, the MIL may come on as the system tests for leaks.

DIAGNOSTIC STEPS (step-by-step)

Safety note: Work in a well-ventilated area away from ignition sources. Evaporative system work involves fuel vapors and compressed air testing; follow proper procedures.

Step 1 – Confirm and document

• Use an OBD-II scan tool to confirm code P0455 and check for any related codes (P0450–P0456 family, or P0440–P0446 family).
• Note freeze-frame data, readiness monitors, and any ongoing fault patterns.
• Check for recent service history that could have disturbed EVAP components (fuel pump service, canister replacement, hoses moved during maintenance).

Step 2 – Inspect the gas cap and filler area

• Remove the gas cap, inspect the gasket/seal for cracks or deformation.
• Reinstall with a clean, dry seal; tighten firmly until you hear a click (per Cap design). If the cap is cracked or deformed, replace with an OEM-spec cap.
• Inspect the filler neck for cracks, gaps, or damaged rubber surrounding the cap. Look for cracks in the neck or signs of fuel evaporation residue.

Step 3 – Visual inspection of EVAP plumbing

• Inspect high-visibility EVAP hoses and vacuum lines for cracking, splitting, hardening, off-mounting clamps, or obvious disconnections.
• Look for signs of fuel seepage or wetness around hoses, canister, purge/vent valves, and connections.
• Check clamps and fittings; loose clamps are a common cause.

Step 4 – Check purge and vent valves

• With a scan tool, attempt to command the purge valve open while engine is running (as allowed by tool). Note whether the valve clicks and whether vacuum/pressure changes are observed.
• Inspect the purge valve and vent valve connectors for corrosion, corrosion resistance, and proper seating.
• If the valves fail to actuate or are stuck, replacement is typically warranted.

Step 5 – EVAP canister and hoses

• If the visual inspection and valve tests do not locate a leak, consider the charcoal canister and its hoses as possible culprits.
• Look for signs of fuel saturation, cracks in hoses leading to the canister, or a canister that appears damaged.

Step 6 – Pressure/SMOKE testing

• The most reliable method to locate a large EVAP leak is a smoke test or dedicated EVAP system pressure test.
• Using a smoke machine or a hand-held EVAP tester, introduce smoke into the system and observe where the smoke escapes (hose connections, canister seals, or filler neck).
• This step often requires specialized equipment or a professional shop.

Step 7 – Repair or replace components

• If a faulty gas cap is found, replace and clear codes. Re-run a drive cycle to confirm return to normal.
• Replace damaged hoses, cracked filler neck components, or hose clamps as needed.
• If purge or vent valves are defective, replace the valve(s) and re-test.
• If the charcoal canister is saturated or damaged, replacement may be needed.
• After any repair, perform a thorough drive cycle to confirm the EVAP monitors complete and the MIL is off; clear codes if they do not reset automatically.

Step 8 – Re-test and confirm

• Clear the codes with a scan tool and drive the vehicle through typical drive cycles to ensure the EVAP monitors complete and the MIL does not return.
• If the MIL returns with P0455 again, revisit the leak source with a smoke test or professional EVAP diagnostic.

RELATED CODES

• P0450 Evaporative Emission Control System Malfunction
• P0451 Evaporative Emission Control System Pressure Sensor Range/Performance
• P0452 Evaporative Emission System Pressure Sensor High Input
• P0453 Evaporative Emission System Pressure Sensor Low Input
• P0454 Evaporative Emission Control System Leakage (General)
• P0456 Evaporative Emission Control System Very Small Leak
  (Note: These related codes are commonly observed in the same EVAP family and can accompany P0455 or appear as alternates depending on the vehicle’s diagnostics and test sequence.)

REPAIR OPTIONS AND COSTS (2025 prices)

Prices can vary by region, shop, and whether OEM parts are used. The figures below are approximate ranges intended to guide budgeting.

• Gas cap replacement

  • Parts: $10–$40
  • Labor: $20–$70 (often a quick DIY or quick shop fix)
  • Typical total: $30–$110

• Fuel filler neck or cap seal replacement

  • Parts: $20–$120
  • Labor: $40–$120
  • Typical total: $60–$240

• EVAP hoses and fittings replacement

  • Parts: $10–$80 (per hose/section)
  • Labor: $60–$180
  • Typical total per repair: $70–$260, depending on number of hoses

• EVAP purge valve replacement

  • Parts: $30–$120
  • Labor: $80–$180
  • Typical total: $110–$300

• EVAP vent valve replacement

  • Parts: $25–$150
  • Labor: $80–$180
  • Typical total: $105–$330

• Charcoal canister (EVAP canister) replacement

  • Parts: $150–$450
  • Labor: $200–$600
  • Typical total: $350–$1,050
  • Note: Canister replacement is more involved and may require limited access; costs vary by vehicle layout.

• EVAP system diagnostic/testing (smoke test)

  • Shop diagnostic fee: $60–$150 (often applied to the repair bill if you proceed with a repair)
  • Smoke machine/equipment use added by some shops

• Total repair range (if canister replacement is needed): typically $350–$1,000+, depending on parts, labor, and whether access is difficult. If the issue is limited to a gas cap or a simple hose/clamp, costs can be well under $200.

Important notes

• Many P0455 cases resolve by simply replacing a faulty gas cap; start with that low-cost fix.
• If a leak is not readily visible, a professional EVAP smoke test is the most reliable method to locate the source.
• Some CR-V owners have reported EVAP issues after service (hoses or clamps not re-connected properly), so review recent work if the MIL comes back after a service.

DIY vs PROFESSIONAL

• Do-it-yourself (DIY) options (low cost, high likelihood of success):

  • Start with the gas cap: replace if cracked or not sealing properly.
  • Visually inspect hoses and clamps in accessible areas around the filler neck and canister; tighten or replace as needed.
  • Use a basic hand-held vacuum/pressure test kit if you have one and know how to interpret results.
  • After any DIY repair, clear codes and drive the vehicle through a few drive cycles to confirm the EVAP monitors pass.

• When to go professional:

  • If the leak source is not visible or easily accessible.
  • If a smoke test or EVAP pressure test is needed to locate a hidden leak.
  • If multiple EVAP components may be involved (canister, valves, complex hose runs) or if you don’t have the tools or safety environment to perform pressure tests.
  • If the MIL returns after your initial repair or if the code reappears after clearing.

PREVENTION

• Always secure the gas cap properly after refueling; replace a damaged cap with an OEM-cap that matches the original design.
• Inspect the fuel filler neck and visible EVAP hoses during routine service for signs of wear, cracking, or loose connections.
• Avoid overfilling the fuel tank, which can pressurize the EVAP system and accelerate leaks or vent issues.
• When performing maintenance in the EVAP area, ensure all hoses and clamps are reconnected and routed correctly to prevent later leaks.
• If you notice a persistent fuel smell or MIL, address it promptly. Small leaks can worsen and lead to more expensive repairs.

Data limitations and transparency

• The provided data shows no recalls or owner complaints for this issue in the NHTSA database for the 2017-2023 CR-V. This means there is limited model-specific incident data available in the prompt. The guide uses general EVAP knowledge and typical CR-V maintenance experience to outline causes, symptoms, and repair steps.
• Costs are estimates based on current market ranges and can vary by location, shop, and parts used (OEM vs aftermarket).