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Q: engine light on cod p0443 on 2003 Cadillac DeVille

like to know what is mean and how much it cost to fix it
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Your on board computer is telling you that code PO443 is causing this code. you can google the OBDll codes and find this information and what this particular code means. I can tell you (after looking it up myself), It refers to the selenoid that controls the EVAP emission system. To start at the beginning, there is a plastic tube that directs the fumes from the gas tank to a charcoal filter in a canister.This canister is located under the vehicle 1/2 way between the tank and the driver. It can be accessed through an access hole in the trunk. However, the actual selenoid is mounted on the throttle body. I recently urchased one off the internet for $40.00 and installed It myself.Believe it or not, but a simple little thing as small as a loose gas cap can cause this code to appear. The whole idea how it works is to burn the built up gasoline fumes in the tank. Once you start the engine the fumes in the lines will be sucked into the engine and burned. Meanwhile, those not burned are routed through a charcoal canister to be neutralized so they won't pollute the atmosphere. Small plastic tubing tie all these parts together routing the fumes to their proper places. I replaced the selenoid on my vehicle but I am still geting this code. Car runs great so I think It Is erroneous.
P0443 EVAP Solenoid Control Circuit Malfunction - With Automatic Transmission
Possible Causes Setting Conditions

Purge solenoid connector is damaged (inspect pins for damage, and moisture)
Purge solenoid control circuit is open, shorted to ground or shorted to voltage
Purge solenoid Ignition circuit is open (check the IGN1 fuse in U/H fuse box)
Purge solenoid has failed
PCM has failed
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