p0455
Easy Fix
Chevrolet · Trucks
Evaporative Emission (EVAP) System Large Leak Detected
Quick Answer
Error code P0455 on your Chevrolet Trucks means: Evaporative Emission (EVAP) System Large Leak Detected. 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
Inspect the gas cap for cracks, damaged seal, or improper seating; tighten or replace
2
Perform a smoke test on the EVAP system to pinpoint the large leak
3
Inspect all EVAP hoses from the fuel tank to the charcoal canister and purge valve
4
Check the charcoal canister for visible cracks or damage
5
Repair or replace the leaking component identified by the smoke test
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
Gas cap
EVAP hoses
Charcoal canister
EVAP purge or vent valve
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