P0455 on Your Redesigned 2024 Buick Enclave
A P0455 on your 2024 Enclave (redesigned 3rd generation) means a large EVAP leak. The all-new Enclave is fully under Buick's premium warranty. Gas cap first.
Symptoms
- Check engine light with P0455
- Possible fuel smell
- Gas cap not seating
- EVAP monitor incomplete
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or factory defect. Warranty-covered.
- EVAP Vent Solenoid (Medium Likelihood): GM vent valve. Warranty-covered.
- Purge Valve (Medium Likelihood): Factory defect. Warranty-covered.
- EVAP Canister (Low Likelihood): Manufacturing issue. Warranty-covered.
- Software Calibration (Low Likelihood): First-year ECM update. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, your Buick dealer will diagnose and repair free. As a redesigned model, dealer diagnostics with GDS2 are recommended.
Warranty
Your 2024 Enclave is covered by Buick's 4-year/50,000-mile warranty through 2028. Federal emissions (8yr/80k) extends through 2032.
Safe to Drive?
Yes. P0455 doesn't affect the engine, AWD, or any features.