Diagnosing P0455 on Your 2024 Ford Bronco
A P0455 on your 2024 Ford Bronco means the PCM detected a large EVAP system leak. On a vehicle this new, the gas cap is still the most likely culprit—but a software calibration or assembly issue is also possible. Your Bronco is fully covered under warranty for any EVAP repair.
What You May Notice
- Check engine light with P0455 stored
- Possible faint fuel smell
- Gas cap feeling loose or not clicking
- EVAP readiness monitor not completing
Most Likely Causes
- Gas Cap (Very High Likelihood): Loose or not seated properly. Tighten until it clicks firmly.
- Software Calibration (Medium Likelihood): PCM sensitivity thresholds may need a Ford TSB update on 2024 models.
- Canister Vent Solenoid (Medium Likelihood): Factory defect causing the vent not to seal. Warranty replacement.
- EVAP Line Connection (Low Likelihood): Assembly-related loose fitting. Warranty-covered.
- Purge Valve (Low Likelihood): Stuck open from factory. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, schedule a Ford dealer visit. They'll check for TSB updates, run IDS diagnostics, and smoke-test the EVAP system—all at no cost to you.
Warranty Coverage
Your 2024 Bronco is fully covered by Ford's 3-year/36,000-mile warranty through 2027 and the federal emissions warranty (8 years/80,000 miles) through 2032. Let the dealer handle this one.
Safe to Drive?
Yes. P0455 has zero effect on the Bronco's engine, transmission, 4x4 system, or trail performance.