P0455 on Chevrolet
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Chevrolet vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 2 Chevrolet models — most commonly on Silverado 1500, Traverse. 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. Typical repair costs on Chevrolet range from $120 to $450, depending on the specific model and root cause.
Common Causes of P0455
- •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
P0455 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- EVAP Vent Solenoid Clogging With Dust/Water Causing Check Engine Light and Hard Refueling2000-2007
A very common GMT800 Silverado problem is contamination of the EVAP canister vent valve/solenoid by dust, road debris, or water intrusion. When the vent cannot flow properly, the truck sets EVAP leak or vent performance codes and may repeatedly shut off the gas pump during refueling. GM issued service bulletins and updated vent relocation kits for trucks used in dusty environments.
Chevrolet Traverse(1 issue)
- EVAP Purge Valve Failure Causing Rough Idle, Stalling and Hard Starts (P0496) — GM Special Coverage N2323953002019
On the 3.6L V6 (RPO LFY) Traverse, the evaporative emissions purge valve can fail to fully close, allowing fuel vapor to flood the intake. This causes a P0496 (EVAP high purge flow) code with rough running, hesitation, or stalling at idle, and hard starting after refueling. GM acknowledged the condition and issued Special Coverage N232395300 (15 years / 150,000 miles) to replace the purge valve at no charge on affected 2019 Traverse units.
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View P0455 across all makes →Frequently Asked Questions
What does P0455 mean on Chevrolet?▼
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 Chevrolet specifically, this code is documented across 2 models.
What causes P0455 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0455 on a Chevrolet?▼
Repair costs on Chevrolet range from $120 to $450, depending on the specific model and root cause.
Which Chevrolet models have P0455 documented?▼
Au7o has documented P0455 on 2 Chevrolet models: Silverado 1500, Traverse.