That is a wide open question. I take it someone told you this was the code stored in your car's computer and your MIL or Check Engine light is on. This code means that, for some reason, the vent solenoid (located under the car near or on the emissions canister) is not working when it should. It could be a bad solenoid, the wiring to it, or even a problem with the computer itself. To avoid throwing money at it by changing parts that may not be bad, have a qualified tech check it out. You can get tips for finding a mechanic at www.autoservicetech.com/forthecarowner.html
Do you mean P1451 ? - Evap Control System Canister Vent Solenoid Circuit Malfunction
P0449ChevroletEVAP Vent Solenoid Control Circuit Malfunction
P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0443 - EVAP control system CANISTER PURGE VALVE CIRCUIT MALFUNCTION - VPWR circuit open - Evap canister purge valve circuit shorted to ground - damaged EVAP canister purge valve - EVAP canister purge valve circuit open - EVAP canister purge valve circuit shorted to VPWR - damaged PCM
install updated vent control solenoid valve and jumper harness.
Do you mean P0433 ? - Evap Canister Purge Control Solenoid or Valve Faulty or Faulty Circuit
Technical DescriptionEVAP Control System Canister Vent Solenoid Circuit Malfunction What does that mean?The EVAP system monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command. SymptomsYou will likely not notice any drivability problems. CausesA code P1451 may mean that one or more of the following has happened: VPWR circuit openDamaged canister vent solenoidCanister vent solenoid circuit open or shorted to ground, power, etc.Damaged Powertrain Control Module (PCM)Possible SolutionsVerify canister vent solenoid - To verify normal functioning, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal. Output test mode may be used to switch output on/off to verify function.Replace canister vent solenoid
Injector #1 control circuit malfunction.Injector #1 control circuit malfunction.
Trouble code P0403 means: EGR Control Solenoid Circuit Malfunction
Its a Canister Purge Control Solenoid
Trouble code P0449 means: EVAP Vent Solenoid Control Circuit Malfunction
Trouble code P0803 means:1-4 upshift (skip shift) solenoid control circuit malfunction