Repairing a trouble code P0443 usually involves bench-testing the EVAP purge solenoid to make sure that it's opening and closing. How To Diagnose And Repair A P0443 Trouble Code A wiring problem causing the EVAP purge solenoid to not get its activation signal.A wiring problem causing the EVAP purge solenoid a lack of 12 Volts.A bad EVAP purge solenoid that is stuck closed.A bad EVAP purge solenoid that is stuck open.If a loose gas cap is not the problem, then the following problems could be causing the P0443 trouble code: But it can also be the result of a loose gas cap (one that wasn't tightened enough after fueling the vehicle). Generally, a P0443 trouble code is caused a bad EVAP purge solenoid. EVAP emission canister (charcoal canister).The EVAP system, on the Chevrolet Silverado (GMC Sierra), consists of: The purpose of the evaporative emission control (EVAP) system is to capture the fuel tank vapors and prevent them from escaping into the ambient air (the atmosphere). If the P0443 is being caused by a EVAP purge solenoid that's stuck closed, then it'll only cause the check engine light to illuminate and cause your Chevrolet Silverado (GMC Sierra) to fail an emissions test.īut if the EVAP purge solenoid is stuck open (when it should be closed), then you'll see one or more of the following problems:īeyond a failed emissions test and the check engine light shining nice and bright on the instrument cluster, the EVAP system problem causing the P0443 trouble code usually does not cause any driveability issues. Once the fuel injection computer commands it ON, the solenoid opens and the fuel vapors can pass thru' it and into the intake manifold. In this state, it does not let fuel vapors pass thru' it and into the intake manifold. Normally, the EVAP purge solenoid is in a closed state (OFF). How? By switching ON and allowing the fuel vapors to be sucked into the intake manifold plenum (when the engine is running and when it's commanded ON by the fuel injection computer). The EVAP purge solenoid is the one responsible for 'purging' the fuel vapors stored in the EVAP carbon canister. 6.0L GMC Sierra (2500): 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006Ī P0443: EVAP System Purge Control Valve Circuit Malfunction tells you that your Silverado or Sierra's fuel injection computer is activating the EVAP purge solenoid, but it isn't responding.You can find this tutorial in Spanish here: Código P0443 ¿Qué Significa? (1999-2006 V8 Chevrolet Silverado, GMC Sierra) (at: ).ĪPPLIES TO: This tutorial applies to the following vehicles: More Chevrolet Silverado (GMC Sierra) Tutorials.How To Diagnose And Repair A P0443 Trouble Code.Common Symptoms Of A P0443 Trouble Code.
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