1. Check the Parking Brake Itself:
* Is it *really* disengaged? Sometimes, the brake lever may *feel* disengaged but isn't fully released. Try firmly releasing the lever several times. If it's a cable-operated system, ensure the cable isn't binding or stuck.
2. Investigate the Electrical System:
* Parking Brake Switch: This is the most likely culprit. The switch, located near the parking brake lever mechanism, tells the car's computer that the parking brake is engaged. A faulty switch can send a false signal even when the brake is off. This switch often needs to be replaced. Locating the exact position of this switch might require consulting a repair manual specific to your 2000 Pontiac Grand Prix GT.
* Wiring: Check the wiring harness connected to the parking brake switch for any damage, corrosion, or loose connections. Inspect the wires all the way to the brake light circuit. A short in the wiring could also cause the light to stay on.
* Brake Light Switch (Separate from Parking Brake): While less likely to cause a *only* the parking brake light to stay on, a malfunctioning brake light switch could contribute to the problem, especially if your brake lights are also acting up.
3. Fuse Check (Less Likely but Possible):
* Although less probable, a blown fuse in the brake light circuit *could* cause the light to stay on if it's creating a short. Check your owner's manual for the brake light fuse location and test it with a multimeter. Replacing a blown fuse is a simple fix, but the underlying cause (like a short) needs to be addressed.
4. Computer/Module Issue (Least Likely):
* In rare cases, a problem within the car's computer system or a related module could send a false signal to the brake lights. This is typically diagnosed by a professional mechanic using diagnostic tools.
How to Proceed:
1. Start with the easiest: First, thoroughly check if the parking brake is fully released. Then, carefully inspect the wiring to the parking brake switch. Look for any obvious damage.
2. Check the switch: The parking brake switch is the most frequent cause. If you're comfortable working on your car, you may be able to replace this switch yourself; otherwise, a mechanic can do it quickly. You'll need to consult a repair manual or online resources to find the switch's location and replacement procedure.
3. Professional help: If you're not comfortable with car repairs, or if the issue persists after checking the switch and wiring, take your Grand Prix to a qualified mechanic. They have the diagnostic tools to pinpoint the problem more accurately.
Important Note: Driving with a constantly illuminated parking brake light can be problematic. While it may not always indicate a true mechanical braking issue, it could be a sign of a larger electrical fault. Ignoring it could lead to further complications.
