Re: Need desperate help P0443
Check the charcoal canister for fuel saturation If the vehicle has been overfueled, then there is a chance that liquid fuel can enter the canister and cause drive problems or emission related problems.
Check orientation of purge solenoid On all Trucks the purge solenoid is marked TOP and BOTTOM and has an arrow that should point up. If installed upside down the result could be Purge flow monitor failure or a Evap purge solenoid circuit failure. Because of the weight of the armature in the purge solenoid, the coil can not effectively pull it off of it's seat.
Review and if necessary, Perform TSB 18-35-98 MODELS: 1999 (WJ) Grand Cherokee. NOTE: THIS INFORMATION APPLIES TO VEHICLES EQUIPPED WITH GASOLINE ENGINES BUILT PRIOR TO DEC. 18, 1998 (MDH 1218XX). SYMPTOM/CONDITION: Some vehicles may exhibit MIL illumination with DTC $12 (P0443) - EVAPORATIVE PURGE SOLENOID CIRCUIT FAILURE. This condition can be caused by electrical noise generated by the ignition switch.