P0496 on Chevrolet
Evaporative Emission System High Purge Flow
P0496 on Chevrolet vehicles indicates evaporative emission system high purge flow. Au7o has documented this code across 1 Chevrolet model — most commonly on Traverse. P0496 means the evaporative emission (EVAP) system detected high purge flow — fuel vapor is flowing into the engine when it shouldn't, typically because the purge valve is stuck or leaking open. The EVAP system captures fuel vapors in a charcoal canister and meters them into the intake through the purge valve at the correct times; unexpected vapor flow can create a vacuum in the tank and disturb fueling. Symptoms can include rough or stalling idle (especially after refueling), hard starting, or a fuel tank vacuum noise when the cap is removed.
Common Causes of P0496
- •Stuck-open or leaking EVAP purge valve/solenoid
- •Faulty purge valve electrical control or wiring
- •Damaged or disconnected purge vacuum hose
- •Faulty vent valve allowing improper flow
- •Failed fuel tank pressure sensor
- •Cracked or pinched EVAP lines
- •Carbon canister saturation or failure
P0496 on Chevrolet by Model
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 P0496 across all makes →Frequently Asked Questions
What does P0496 mean on Chevrolet?▼
P0496 stands for "Evaporative Emission System High Purge Flow." P0496 means the evaporative emission (EVAP) system detected high purge flow — fuel vapor is flowing into the engine when it shouldn't, typically because the purge valve is stuck or leaking open. The EVAP system captures fuel vapors in a charcoal canister and meters them into the intake through the purge valve at the correct times; unexpected vapor flow can create a vacuum in the tank and disturb fueling. Symptoms can include rough or stalling idle (especially after refueling), hard starting, or a fuel tank vacuum noise when the cap is removed. On Chevrolet specifically, this code is documented across 1 model.
What causes P0496 on Chevrolet vehicles?▼
Common causes on Chevrolet: Stuck-open or leaking EVAP purge valve/solenoid, Faulty purge valve electrical control or wiring, Damaged or disconnected purge vacuum hose, Faulty vent valve allowing improper flow, Failed fuel tank pressure sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0496 on a Chevrolet?▼
Repair costs vary widely depending on the root cause and specific Chevrolet model.
Which Chevrolet models have P0496 documented?▼
Au7o has documented P0496 on 1 Chevrolet model: Traverse.