Hello everyone! I am a proud owner of a 2000 Pontiac Bonneville SSEI. This is my third Bonneville and I absolutely love this one. It has given my many problems, but I just keep fixing it because it'* became a family member. I am currently having issues with the car not starting. Code P0443 is all I am getting from it. I'm completely lost on this issue. Should I get a new gas cap first or is this a much bigger problem?

Nice to have ya missbeckylynn

welcome to the forum, it sound like a familiar story. ive had some issues with the car too but i have to keep fixing it because my wife loves the thing. its had a almost constant evap code of one kind or another almost since we got it about 10yrs ago.

Causes

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

I have other problem and I am not sure if leads back to the code. My temperature gauge drops off to nothing then kicks back on. This happens every couple minutes. Can anyone give me any info on where the purge solenoid is located?

could be different because of year i dont know but
https://www.gmforum.com/specifications-general-information-132/vacuum-lines-sensors-278867/