Question about 1998 GMC Sonoma
And you cannot see any obvious signs of leaks? Is that the only code it shows?
Posted on Jul 28, 2009
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Posted on Jan 02, 2017
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Evaporative Emission Control System Leak Detected (no purge flow
or large leak)
What does that mean? This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms You likely won't notice any drivability problems.
Causes A code p0455 most likely means one or more of the following has happened:
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