Investigating P0455 on Your 2024 Chevrolet Silverado
A P0455 on your 2024 Silverado means the ECM detected a large EVAP leak—equivalent to a 0.040-inch or larger opening. On a truck this new, the gas cap is still the prime suspect. Your Silverado is fully under GM's warranty for this repair, so let the dealer handle anything beyond the gas cap.
Evidence to Examine
- Check engine light with P0455 (possibly P0449 companion code)
- Faint fuel odor near the fuel filler or bed area
- Gas cap not clicking when tightened
- EVAP monitor not completing
Causes Ranked
- Gas Cap (Very High Likelihood): Loose or not seated properly. Tighten until it clicks firmly.
- Software Calibration (Medium Likelihood): GM may have a TSB for EVAP monitor sensitivity on 2024 models.
- Vent Valve Solenoid (Medium Likelihood): GM's vent solenoid near the charcoal canister. Warranty-covered.
- Purge Solenoid (Low Likelihood): Stuck open. Warranty-covered replacement.
- EVAP Line Connection (Low Likelihood): Assembly-related loose fitting. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 returns, take your Silverado to a GM dealer. They'll check for TSBs, run GDS diagnostics, and smoke-test the system—all free under warranty.
Warranty Coverage
Your 2024 Silverado is covered by GM's 3-year/36,000-mile bumper-to-bumper warranty through 2027 and the federal emissions warranty (8 years/80,000 miles) through 2032. All EVAP repairs are free.
Safe to Drive?
Yes. P0455 doesn't affect the Silverado's engine, transmission, towing capacity, or 4x4 system.