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 6 Chevrolet models — most commonly on Colorado, Equinox, HHR. 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 $25 to $600, 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 Colorado(1 issue)
- EVAP Vent Valve and Charcoal Canister Dust Ingestion Causing Check Engine Light and Hard Refueling2004-2012
First-generation Colorado trucks frequently develop EVAP system faults because the vent valve and canister are mounted in an area exposed to dust, dirt, and road debris. Contamination can clog the vent path or stick the valve, triggering a check engine light and causing the fuel nozzle to click off repeatedly during refueling. This issue is especially common on trucks used on gravel roads or in dusty environments.
Chevrolet Equinox(1 issue)
- EVAP Canister Purge Valve Stuck Open Causing P0496 / Rough Running (3.0L & 3.6L V6)2010-2017
The vapor-canister purge solenoid on the V6 Equinox (and Terrain) commonly fails stuck-open, letting fuel vapor flow into the intake when it shouldn't. This sets DTC P0496 (EVAP flow during a non-purge condition) and sometimes P0455/P0446, illuminates the check-engine light, and can cause a rough/rich idle, hard starting, and even a faint fuel smell. It is one of the most frequently replaced emissions parts on the V6 Equinox because the valve is a known weak point and the repair is cheap and easy. The valve sits on top of the engine and is a roughly one-hour DIY job.
Chevrolet HHR(1 issue)
- Fuel Line Corrosion and Leak Near Rear Wheel2006-2011
The HHR has a documented issue with fuel line corrosion, particularly in rust belt states. The fuel line corrodes just forward of the driver-side rear wheel, developing leaks that create a fire hazard. Road salt and debris accelerate the corrosion. The issue is most commonly seen on vehicles in the northeastern and midwestern United States where road salt is used heavily in winter.
Chevrolet Malibu(1 issue)
- P0455 — Gross EVAP Leak from Loose/Failed Gas Cap or Stuck Purge Valve2012-2023
P0455 indicates a large EVAP leak (a hole ~0.040 inch or bigger). On the Malibu the leading cause — more than half of cases across GM cars of this era — is a loose, missing, or failed fuel cap (or, on 2016+ capless cars, a bad filler-neck seal). The second most common cause is a failed EVAP purge valve stuck open, a notoriously common GM failure shared across the Impala, Camaro, and others. Cracked or disconnected canister/vent hoses can also let enough vapor escape to trip the gross-leak monitor.
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.
Looking for P0455 on a different make?
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 6 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 $25 to $600, depending on the specific model and root cause.
Which Chevrolet models have P0455 documented?▼
Au7o has documented P0455 on 6 Chevrolet models: Colorado, Equinox, HHR, Malibu, Silverado 1500, Traverse.