What does code P0455 mean on a Chevrolet and is it safe to drive?
P0455: Evaporative Emission System Leak Detected (Large Leak). Here's what it means on your Chevrolet, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
A large leak has been detected in the EVAP system. Could be gas cap left off, disconnected hose, or damaged canister.
Common causes for your Chevrolet
- Gas cap missing or not sealed
- Disconnected or ruptured EVAP hose
- Damaged charcoal canister
- Faulty purge/vent solenoid
Symptoms
- Check Engine Light
- Fuel smell possible
Typical fixes
- Install or replace gas cap
- Inspect and repair EVAP hoses
- Replace canister or valves as needed
Repair cost range
For a Chevrolet, repairs for P0455 often fall between $20 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Chevrolet
P0455 on Chevrolet trucks typically starts with the gas cap or a cracked EVAP vent hose at the canister. The vent solenoid on Silverado/Suburban mounts near the frame and is prone to moisture damage.
Most commonly affected models
Silverado 2004–2014Equinox 2005–2015Suburban 2000–2014