P0455 on Saturn: How to Diagnose & Fix
Evaporative Emission Control System Leak Detected (Gross Leak)
1 Saturn model · 1 documented issue · $100-$350 repair
P0455 on Saturn by model: symptoms, diagnosis and fix
Auras commonly throw EVAP emissions faults, most often from a stuck-open or failing canister purge solenoid/valve (and sometimes a clogged charcoal canister or faulty fuel-tank pressure sensor). The result is a persistent check engine light and potential emissions-test failure. The gas cap is worth checking first but is usually not the cause of the P0496 flow-during-non-purge code.
Common Symptoms
- Check engine light on
- Failed emissions/smog test
- Occasional rough idle
- Fuel odor in some cases
How to Fix
Confirm the gas cap is tight, inspect EVAP vacuum lines for cracks, then replace the canister purge solenoid/valve if it is stuck open. Replace the charcoal canister or fuel-tank pressure sensor if those are at fault.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- AM Autoparts AM-3296354606 vapor-canister purge solenoid
Confirm VIN/engine and connector.
- AM Autoparts AM-2568817646 vapor-canister purge solenoid
Confirm VIN/engine and connector.
- ACDelco 214-1946 vapor-canister purge valve
Confirm VIN/engine and current GM supersession.
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Sources for this issue (2)
P0455 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0455 mean on a Saturn?
P0455 stands for "Evaporative Emission Control System Leak Detected (Gross Leak)." This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor. On Saturn it is documented across 1 model: Aura.
What are the most common causes of P0455?
The most common causes of P0455 are: Loose, missing, or improperly tightened gas cap, Worn, cracked, or failed gas cap seal, Cracked or disconnected EVAP/vapor hose, Damaged or missing fuel filler neck seal, Faulty EVAP purge valve stuck open, Failed EVAP vent valve, Cracked or damaged charcoal canister. The specific cause varies by vehicle.
How much does it cost to fix P0455 on a Saturn?
Published repair estimates on Saturn range from $100 to $350 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0455 on a different make?
View P0455 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.