Question about 2003 Cadillac Deville
This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 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.
Keep in mind that the P0442 is many times caused by a bad or loose fuel cap or fueling while the engine is running. If the cap does not fix the problem there is a machine that needs to be connected to the vehicle to help find the leak by pumping inert smoke into the system.
Hope this helps.
Posted on May 06, 2013
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Posted on Jan 02, 2017
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