P0455 Code: Toyota Camry (2018-2024) - Causes, Symptoms & Fixes

Comprehensive diagnostic guide for OBD2 code P0455 on 2018-2024 Toyota Camry

Data note and limitations

• The provided NHTSA data shows no recalls for this model/year range, and the only owner complaint in the snippet is for code P0442 (not P0455). Therefore, there is no model-year–specific NHTSA complaint data to anchor P0455 in Camry (2018–2024) here.
• Because P0455 is an evaporative Emissions system (EVAP) fault, this guide leans on standard EVAP diagnostic principles plus Toyota-Camry–specific layout knowledge, but the precise fault history for P0455 in these Camrys is not represented in the data you provided.
• In short: No recalls found in NHTSA database (per the dataset). Use this guide as a comprehensive diagnostic framework, not as a statement of Camry-specific historical cases for P0455.

Code meaning and severity

• Code: P0455
• Full name: Evaporative Emission Control System Leak Detected (Gross Leak Detected)
• What it means:
  • The vehicle’s EVAP system has detected a large (gross) leak somewhere in the system that prevents the EVAP system from sealing properly.
  • Symptoms may be intermittent or persistent; the MIL (check engine light) is typically illuminated.
• Severity and implications:
  • Emission-related fault; can cause a failure to pass emissions testing in many jurisdictions.
  • Engine performance is usually not directly affected, but some Camrys may experience minor idle fluctuations or reduced fuel economy if the leak interacts with other systems.
  • Ignoring the fault can lead to worsening leaks and possible additional EVAP-related codes.

Common causes on Toyota Camry (2018–2024)

• Gas cap or capless filler issues
  • Loose, damaged, or missing fuel cap (or capless filler seal) is a frequent source of EVAP leaks, including dramatic leaks that trigger P0455 if the leak is large enough.
• Leaking or damaged EVAP hoses and lines
  • Cracked, brittle, or disconnected hoses between the fuel tank, purge valve, charcoal canister, and intake manifold.
  • Hose clamps that have loosened or corroded.
• Charcoal canister problems
  • Cracked canister or saturated/failed canister that allows vapor leaks.
• EVAP purge valve (N80) problems
  • Purge valve stuck open, stuck closed, or electrically faulty; improper purge flow can create conditions that register as a gross leak in the EVAP system.
• EVAP vent valve or vent lines
  • Faulty vent valve or defective vent lines can cause venting leaks or improper sealing of the system.
• Fuel tank venting and related components
  • Leaks or damage around the fuel tank, filler neck, or associated vent lines.
• Secondary sources
  • Damaged or substituted aftermarket components, or prior repair work that didn’t seal properly (clamps, connectors, or hose routing).

Symptoms you might notice

• Check Engine light (MIL) on or flashing
• Emissions-related warning or readiness monitors not completing
• Smell of gasoline around the vehicle or inside the cabin
• Possible noticeable fuel odor after fueling or when parked
• Possible slight decrease in fuel economy
• In some cases, no obvious symptoms beyond the MIL; the EVAP system can have a leak large enough to trigger P0455 without impacting driveability

Diagnostic steps (step-by-step, in practical order)

• Step 0: Verify the fault
  • Use a scan tool to confirm P0455 is current, check freeze-frame data, and note any related EVAP codes (e.g., P0440–P0446, P0442, P0450–P0454).
  • If multiple EVAP codes exist, address the primary gross leak first, then follow secondary codes.
• Step 1: Inspect the gas cap or capless filler system
  • Ensure the cap is properly installed and seated. If the Camry uses a capless filler, inspect the filler neck seal and the mechanism that seals the system.
  • If the cap or filler assembly is damaged or the capless seal is degraded, replace the cap or the relevant filler neck assembly.
  • After addressing the cap, perform a drive cycle or drive-to-diagnose to see if the code returns.
• Step 2: Visual inspection of EVAP plumbing
  • Inspect all visible EVAP hoses for cracks, splits, burns, or disconnections, especially near the engine bay and around the purge valve and canister lines.
  • Check hose clamps for looseness or corrosion.
  • Inspect the EVAP canister for cracks or signs of damage (canister located near the fuel tank area; in many Camrys, this is under the rear area, but accessibility varies by generation).
• Step 3: Inspect/evaluate the purge valve (N80) and vent valve
  • Check the purge valve for proper operation: it should open/close when commanded by the PCM; check electrical connector and wiring for damage.
  • If possible, test the valve with a noid light or appropriate diagnostic tool to verify purge pulse is present during engine operation.
  • Inspect the EVAP vent valve (if applicable) for proper operation and seals.
• Step 4: Pressure/flow testing of EVAP system
  • Perform an EVAP system pressure test or a smoke test with a capable diagnostic machine.
  • Smoke testing is the most effective way to locate leaks: introduce smoke into the EVAP system and observe where it escapes (gas cap, hoses, canister, filler neck, etc.).
• Step 5: Inspect the charcoal canister
  • Look for physical damage, cracks, or saturated canister. If the canister is compromised, it should be replaced.
• Step 6: Inspect fuel tank and vent lines
  • Look for leaks around the fuel tank, filler neck, and related vent lines. Any punctures or corrosion warrants component replacement.
• Step 7: Road test and monitor
  • After any repair, clear the codes and perform a relevant drive cycle to ensure the EVAP system tests pass and no new codes reappear.
• Step 8: If no leak is found
  • Consider replacing the purge valve (N80) or the EVAP canister if all external leaks have been ruled out and the fault persists.
  • In rare cases, PCM or sensor calibration issues can trigger false positives; re-check with a qualified technician if symptoms persist.

Related codes to watch for

• P0440: Evaporative emission system malfunction
• P0441: Evaporative system purge flow fault
• P0442: Evaporative small leak detected (often a minor leak)
• P0443: Evaporative purge control valve circuit fault
• P0446: EVAP vent control circuit fault
• P0450–P0454: Evaporative system pressure sensor and related sensor faults
• P0456: Evaporative system very small leak (smaller leaks than P0455)
  Note: These are commonly associated EVAP codes. They can appear together or sequentially as the system leaks are diagnosed and repaired.

Repair options and estimated costs (2025 price ranges)

Note: Prices vary by region, dealer vs independent shop, and the exact Camry generation. All ranges are approximate retail figures to help budgeting. Labor is a major component.

• Gas cap or capless filler replacement

  • Parts: $10–$60
  • Labor: $0–$60 (DIY vs shop)
  • Typical total: $20–$120
  • Notes: If capless filler, replacement of the filler neck/seal may be required in rare cases.

• EVAP hose/line repair or replacement (external leaks)

  • Parts: $20–$200 (depending on length and routing)
  • Labor: 1–2 hours
  • Typical total: $200–$600

• EVAP purge valve (N80) replacement

  • Parts: $40–$150
  • Labor: 0.5–2.0 hours
  • Typical total: $150–$400

• EVAP canister replacement

  • Parts: $150–$700
  • Labor: 2–4+ hours
  • Typical total: $500–$1,500

• EVAP system smoke test and diagnosis

  • Parts: minimal (often diagnostic)
  • Labor: $100–$250
  • Typical total: $100–$300 (diagnostic only; actual repair costs add to the above)

• Combined scenarios (cap issue plus hose leak, or multiple components)

  • Expect total in the range of $200–$1,800 depending on what is found and repaired.

• Diagnostic fees

  • Most shops charge a diagnostic fee if the vehicle is not confirmed to be under a prior repair, commonly $80–$150. Some shops waive the diagnostic fee if you proceed with the recommended repair.

DIY vs PROFESSIONAL

• DIY viability:
  • Easy/low-cost: Check and replace the gas cap or capless filler seal if suspected.
  • Moderate difficulty: Inspect visible EVAP hoses and clamps; replace obvious damaged hoses.
  • Advanced/less advisable: Purge valve replacement, canister replacement, and smoke testing require tools (noid light, vacuum/pressure testing equipment, or a smoke machine) and knowledge of the EVAP system. Disconnecting fuel lines or testers may pose safety risks.
  • Safety: Evaporative system is a sealed but potentially pressurized system; avoid pressurizing with a wrench or tool; work in a well-ventilated area; disconnect battery only if instructed by repair steps.
• Professional viability:
  • Recommended for persistent or complex P0455 cases, especially if a full smoke test or pressure test is required.
  • Pros: Accurate leak localization, proper EVAP system diagnosis, correct replacement parts, and confirmation tests to ensure the MIL does not reappear.

Prevention tips

• Use a good, properly sealed gas cap or maintain capless filler components; replace if seal or mechanism shows wear.
• Avoid overfilling the tank; let the EVAP system drain properly and avoid fueling to the very top.
• Schedule periodic inspection of EVAP hoses, clamps, and canister in routine service visits (especially if you notice fuel odors or poor fuel economy).
• Address any EVAP-related service messages promptly to prevent larger leaks from developing.
• After any EVAP-related service, ensure the technician clears all codes and confirms the system passes all EVAP tests.

Data caveats and interpretation notes

• The dataset provided lists no recalls for the Camry 2018–2024; no P0455-specific data is in the provided owner complaint data. The guide above uses standard EVAP diagnostic practices and Toyota/Camry design considerations to support a practical diagnostic approach.
• If you have a Camry that repeatedly triggers P0455 after simple fixes (e.g., gas cap reseating), it may indicate a more pervasive EVAP leak or a canister/valve issue that requires a smoke test or professional diagnostic equipment.
• If a P0455 code appears with other EVAP codes (like P0442 or P0440), address the primary (largest) leak first, then test again.

Summary

• P0455 is a gross EVAP leak fault that can stem from a bad gas cap, damaged hoses, a faulty purge valve, or a damaged charcoal canister in the Camry 2018–2024 model years.
• Start with the simplest fix (gas cap/capless filler inspection) and progress to a smoke test to locate the leak.
• Expect repair costs spanning from a modest gas-cap fix to potentially several hundred dollars for real EVAP component replacements; more extensive repairs (canister, lines) can exceed $1,000.
• For persistent P0455, professional diagnosis with smoke testing is strongly recommended to correctly identify and repair the leak, ensure the MIL is cleared, and pass emissions testing.