P0456 on Your 2024 Toyota 4Runner
A P0456 on your 2024 4Runner (final year of the 5th generation) means a very small EVAP leak. The 4.0L V6 uses Toyota's VSV EVAP system and is fully under warranty. Gas cap first, then let your dealer handle it free.
Symptoms
- Check engine light with P0456
- No drivability issues
- Gas cap may feel slightly off
- EVAP monitor incomplete
Top Causes
- Gas Cap Seal (Very High Likelihood): Tiny imperfection. Warranty-covered.
- VSV (Vacuum Switching Valve) (Medium Likelihood): Toyota EVAP valve. Warranty-covered.
- Charcoal Canister (Low-Medium Likelihood): Factory issue. Warranty-covered.
- EVAP Line Connection (Low Likelihood): Assembly gap. Warranty-covered.
- ECU Software (Low Likelihood): Calibration. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0456 persists, your Toyota dealer will diagnose free using Techstream.
Warranty
Toyota's 3yr/36k covers everything through 2027. Federal emissions (8yr/80k) extends through 2032.
Safe to Drive?
Yes. P0456 has zero impact on the V6, 4WD, or off-road capability.