P0455 on Chevrolet: Evaporative Emission System Large Leak Detected
Severity: 1 of 4
Safe to drive in most cases. Check the gas cap right away. If you smell strong raw fuel or see dripping fuel, park it and get it inspected, because that may be a liquid leak rather than a vapor leak.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0455 usually means on a Chevrolet
GM bulletin 23-NA-073 covers 2019 and later Silverado and Sierra trucks where dust plugs the EVAP canister and vent solenoid, setting P0449 or P0455. The fix adds a vent filter. On other GM vehicles, the vent solenoid is still a common suspect.
Most likely causes on Chevrolet vehicles
- Gas cap
- Vent solenoid
- Purge valve
- EVAP hoses
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Chevrolet specific tips
- Inspect the vent solenoid near the tank.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Gas cap | $10 to $35 | 0.0 to 0.1 h | $10 + 0.0 × $110 = $10 $35 + 0.1 × $190 = $54 |
| EVAP hose | $15 to $80 | 0.3 to 1.0 h | $15 + 0.3 × $110 = $48 $80 + 1.0 × $190 = $270 |
| Vent or purge valve | $25 to $150 | 0.3 to 1.5 h | $25 + 0.3 × $110 = $58 $150 + 1.5 × $190 = $435 |
Costs are generic for this code; parts and labor on some Chevrolet models may run higher.
Watch a repair video
How To Fix Large Evap Leaks On Your Car P0455 (Scotty Kilmer). Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0455 Chevrolet fix” videos.
Repair manuals
Step-by-step service manuals for Chevrolet with torque specs and wiring diagrams:
Haynes manuals for Chevrolet Chilton manuals
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Check Chevrolet recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Is the vent solenoid common on Chevy trucks?
Yes, it is frequently replaced.
Read the full P0455 guide or more Chevrolet check engine notes.