2012 GMC P0455: What It Means & Is It Safe to Drive?
P0455 on the 2012 GMC: Evaporative Emission System Leak Detected (Large Leak). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainMedium urgency
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 on the 2012 GMC
- 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 2012 GMC, repairs for P0455 typically fall between $20 and $500, depending on the root cause and labor rates in your area.
Known issues on GMC
GMC P0455 mirrors Chevrolet—gas cap first, then the EVAP vent solenoid near the fuel tank. On Sierra and Yukon, the canister bracket corrodes in northern climates allowing moisture to crack the canister body; physically inspect it before ordering parts.
Most commonly affected models
Sierra 2007–2014Yukon 2007–2014Envoy 2002–2009