Diagnosing P0455 on Your 2024 Toyota 4Runner
A P0455 on your 2024 Toyota 4Runner means the ECM detected a large EVAP system leak. Your 5th-generation 4Runner—the final year before the 6th-gen arrives—with the 4.0L V6 is under full warranty. Check the gas cap first.
Symptoms
- Check engine light with P0455
- Possible fuel odor
- Gas cap not clicking
- EVAP readiness monitor incomplete
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or defective. Tighten until it clicks. Warranty-covered.
- Canister Close Valve (CCV) (Medium Likelihood): Toyota's vent valve. Warranty-covered.
- EVAP Hose Connection (Medium Likelihood): Assembly issue. Warranty-covered.
- Purge VSV (Low Likelihood): Vacuum switching valve. Warranty-covered.
- Charcoal Canister (Low Likelihood): Manufacturing defect. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If the light persists, your Toyota dealer handles everything under warranty with Techstream diagnostics.
Warranty Coverage
Your 2024 4Runner is covered by Toyota's 3-year/36,000-mile basic warranty, 5-year/60,000-mile powertrain warranty, and federal emissions warranty (8yr/80k). All EVAP repairs are free.
Safe to Drive?
Yes. P0455 doesn't affect the 4Runner's 4.0L V6, 5-speed automatic, 4WD, or off-road capability.