2021 Pontiac P0455: What It Means & Is It Safe to Drive?
P0455 on the 2021 Pontiac: 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.
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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 on the 2021 Pontiac
- 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 2021 Pontiac, repairs for P0455 typically fall between $20 and $500, depending on the root cause and labor rates in your area.
Known issues on Pontiac
Pontiac P0455 on GM platforms starts with the gas cap. On G6 and Grand Prix, a failed EVAP canister purge solenoid is the second most common cause; it is inexpensive and easy to replace before performing a full smoke test.
Most commonly affected models
G6 2005–2010Grand Prix 2004–2008Torrent 2006–2009