I have a 2001 dodge ram 1500 code P0443 code came on code p0455 code was on I replace the purge valve then the code p0443 came on

DTC P0443
Circuit Description
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge valve. The EVAP canister purge valve is pulse width modulated (PWM). The scan tool displays the amount of ON time as a percentage. The control module monitors the status of the driver. The control module controls the EVAP canister purge valve ON time by grounding the control circuit via an internal switch called a driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.


Suggest you view video's on youtube for testing PCM/ECM drivers , scanner danner videos . You may have a fried driver . The computer isn't controlling it .

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OBD-II Trouble Code: P0443 Evaporative Emission Control ...

www.obd-codes.com/p0443

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www.jaguarforums.com > ... > XJ XJ8 / XJR ( X308 )

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Purge control circuit problem. Part of Evaporative emission control system.

Error Code: P 0443
Description:
Evaporative Emission (EVAP) Canister Purge Valve - Circuit Malfunction
Problem Area:
Wiring, or VSV connector loose or detached.
Evaporative emission (EVAP) canister purge valve.

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.

P0443 Code is purge control valve circuit. Go to the driver side near the battery or better yet use the underhood sticker emission diagram That black cylinder is the canister,on it is the purge valve which hoses lead to the intake. make sure the hose are not torn,or leaking or disconnected if it is clear the code rerun the monitor (just drive it its 2 trip),because more likely that would be the code for P0443.Just because its a valve circuit doesnt mean its the valve circuit the ECM sent a command to purge and the MAP did not detect a purge,The ECM doesnt know if it is caused by a bad purge solenoid a disconnected line for the purge (normally closed) so it coded it if you want to fix it it is either the hose of the purge or the valve itself.

Code P0443 is related to the EVAP purge circuit.

maybe a fuse is blown? did you have the mechanic check the fuses? or even check all your relays and wiring?

danbalue, a code P1765 means Transmission 12V Supply Relay Control Conditions and P1494 means EVAP LDP Pressure Switch Fault Conditions.

I found info on the following codes:
P0443 - http://www.obd-codes.com/p0443
P1494 - http://www.check-engine-light.com/dodge

Good luck.

might need to replace the purge selonoid valve