p0496
Easy Fix
Chevrolet · Trucks
Evaporative Emission (EVAP) System High Purge Flow
Quick Answer
Error code P0496 on your Chevrolet Trucks means: Evaporative Emission (EVAP) System High Purge Flow. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CK15706Colorado LT 2024Colorado Trail Boss 2024Colorado WT 2024Colorado Z71 2024Colorado ZR2 2024Silverado 1500 Custom 2024Silverado 1500 High Country 2024Silverado 1500 LT 2024Silverado 1500 LT Trail Boss 2024Silverado 1500 LTZ 2024Silverado 1500 RST 2024Silverado 1500 WT 2024Silverado 1500 ZR2 2024Silverado 2500HD High Country 2024Silverado 2500HD LT 2024Silverado 2500HD LTZ 2024Silverado 2500HD WT 2024CL14543CS10403CK10743CK10543CK20943CK30943CK10906
Likely Causes
How to Fix It
1
Locate the EVAP purge valve (usually on or near the intake manifold)
2
Disconnect the purge valve and check if it holds vacuum when off (should not pass air)
3
Inspect all EVAP hoses from the purge valve to the charcoal canister for cracks
4
Test the purge valve solenoid with a multimeter and apply voltage to confirm operation
5
Replace the purge valve if it is stuck open or not sealing
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
EVAP purge solenoid valve
EVAP system hoses
Hose clamps
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