error code 452 and light auto turn on on 2000 GMC Safari

I have an intermittent code 452. the service engine light will come on, check the code get 452. Without doing anything to vehicle the light will go out in couple days. No code. then couple days later will come on again an repeat. Any thoughts. Also how can I turn off the module/switch that turns on the headlights when it is dark/dusk?

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