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To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
Bad purge solenoid (internal short or open)
Wiring harness chafing or rubbing another component causing short or open on control circuit Connector worn
broken or shorted due to water intrusion
Driver circuit inside powertrain control module (PCM) is bad
code p0440 refers to evaporative emission (EVAP) system--malfunction=== causes --hose connections --intake leak--EVAP canister purge valve
code po441 refers to EVAP --incorrect flow detected==causes the same as for po440
code po446 refers to EVAP system vent control --circuit malfunction===causes --wiring---EVAP can purge valve--ECM
generally I would replace the purge valve as it is common to all codes
Code 443 is a problem with the EVAP canister purge control valve. The computer can not purge the vapors in the gas tank to the canister because the valve is not functional. The valve and the circuit would need to be tested.
Possible causes- Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted - Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection - Faulty Evaporative Emission (EVAP) Purge Solenoid Control
A code P0446 could mean one or more of the following has happened: - Faulty vent valve - Open, short or excessive resistance on Vent valve control circuit - Blockage of vent valve - Bad PCM
With a P0446 OBD-II trouble code, here are some things to try: - Replace Vent valve - Repair open, short, or resistance problem in control circuit - Repair open, or short, or resistance problem in power circuit
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. 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.
EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Causes: A code P0441 could mean one or more of the following has happened: Bad vacuum switch Broken or damaged EVAP line or canister Open in PCM purge command circuit Open or short in Voltage feed circuit to Purge Solenoid Faulty purge solenoid Restriction in EVAP solenoid, line or canister Corrosion or resistance in purge connector Bad PCM
Possible Solutions: with a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try: Common Chrysler fix - Replace Leak Detection Pump / LDP Repair damaged EVAP lines or canister Repair open or short in voltage feed circuit to Purge Solenoid Repair open in PCM purge command circuit Replace purge Solenoid Replace vacuum switch Repair restriction in Evap line or canister or soleniod Repair resistance in purge connector Replace PCM
P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:
P0441 Evaporative Emission System Incorrect Purge Flow P0442 Evaporative Emission System Leak Detected (small leak) P0443 Evaporative Emission System Purge Control Valve Circuit P0444 Evaporative Emission System Purge Control Valve Circuit Open P0445 Evaporative Emission System Purge Control Valve Circuit Shorted P0446 Evaporative Emission System Vent Control Circuit P0447 Evaporative Emission System Vent Control Circuit Open P0448 Evaporative Emission System Vent Control Circuit Shorted P0449 Evaporative Emission System Vent Valve/Solenoid Circuit P0450 Evaporative Emission System Pressure Sensor/Switch P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance P0452 Evaporative Emission System Pressure Sensor/Switch Low P0453 Evaporative Emission System Pressure Sensor/Switch High P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent P0455 Evaporative Emission System Leak Detected (large leak) P0456 Evaporative Emission System Leak Detected (very small leak) P0457 Evaporative Emission System Leak Detected (fuel cap loose/off) P0458 Evaporative Emission System Purge Control Valve Circuit Low P0459 Evaporative Emission System Purge Control Valve Circuit High
At least the cap isn't loose for the gas tank.
I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.