2024 Cadillac XT6 P0455: Large EVAP Leak — Warranty Guide

P0455 on Your 2024 Cadillac XT6

A P0455 on your 2024 XT6 means a large EVAP leak. The 3-row luxury crossover is fully under Cadillac's premium warranty. Gas cap first.

Symptoms

• Check engine light with P0455
• P0449 may appear
• Possible fuel smell
• Gas cap not seating

Top Causes

1. Gas Cap Seal (Very High Likelihood): Loose or factory defect. Warranty-covered.
2. EVAP Vent Solenoid (Medium Likelihood): GM vent valve. Warranty-covered.
3. Purge Valve (Medium Likelihood): Factory defect. Warranty-covered.
4. EVAP Canister (Low Likelihood): Manufacturing issue. Warranty-covered.
5. Software Calibration (Low Likelihood): ECM update. Warranty-covered.

What to Do

Tighten the gas cap and drive 2–3 days. If P0455 persists, your Cadillac dealer will diagnose and repair free under warranty.

Warranty

Your 2024 XT6 is covered by Cadillac'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.

Frequently Asked Questions