Need help with my 2001 pontiac grand prix - it seems sluggish all of a sudden, service engine soon light came on a couple times then went out, seems poor on power,

This says it is a Fuse

https://www.startmycar.com/ca/pontiac/grand-prix/info/fusebox/2001

This seems to explain it
https://www.reddit.com/r/Pontiac/comments/krgfsf/does_anybody_know_anything_about_the_power_drop/

Owner's Manual
https://my.gm.ca/gm/en/content/dam/gmownercenter/gmna/GMCC/dynamic/2001/pontiac/grandprix/en/2001_Pontiac_Grandprix_Manual_en_CA.pdf

....

No it does not. The Service Engine Soon (SES) light and the Check Engine light are the same thing, just with different words. They're both the Malfunction Indicator Lamp (MIL) just with different wording. GM decided to be special in that regard.

If the "service soon" is turn on, this is a warning about "maintenance time" (filter and fluids change); this warning light isn't the same that "check engine".

Hope helps.

You might have blown the 15 amp fuse that powers the cigarette lighter socket. This fuse also powers pin #16 in the test connector and if there isn't any power at pin #16 then the scan tool can't read engine data. Hope this helps out!

This means that since the last service, the mileage is close to the term for the next service. Hope this helps

CHECK TRANSMISSION FLUID IT COULD BE LOW OR YOU NEED A FLUID AND FILTER CHANGE.YOUR TRANSMISSION IS SLIPPING REASON FOR SLUGGLISH TAKE OFF.

3.1 AND 3.8 ARE KNOWN FOR UPPER AND LOWER INTAKE GASKETS

check evap vent solenoid alot stick on these cars.

This happens when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

This happens usually when the thermostat/temperature sensor is faulty, and is bad for emissions and fuel consumption.

The repair cost may vary, even if themperature sensor is not an expensive part, after replacing the sensor there is need to reset the ECU (car computer module).

you can go to advance auto and use there scanner for free to clear the code its called an obd2 connection or when you disconnect your battery you can touch your black negative cable to your red positive cable that connects to the battery and it will completley drain everything and reset but warning you if your trying to get the car through emissions your gonna have to drive the car 50 or 100 miles after you disconnect the battery each time..