1. Shift Interlock Mechanism: This is the most common culprit. The interlock prevents the car from shifting out of park unless the brake pedal is depressed and the key is in the "on" or "run" position (not just accessory).
* Check the Brake Pedal: Make sure the brake pedal is firmly pressed down. If the brake lights don't illuminate when you press the pedal, there's a problem with the brake light switch, which is also part of the shift interlock system. A faulty brake light switch is a common cause.
* Check the Brake Pedal Switch: This is usually located on the brake pedal itself. You may need to access it from under the dash (consult a repair manual for your specific model). Test the switch with a multimeter to see if it's providing continuity when the brake is depressed.
* Key Position: Ensure the key is in the "on" or "run" position, not just accessory.
* Shift Lever: Try gently rocking the shift lever back and forth while pressing the brake pedal. Sometimes it just needs a little persuasion.
2. Shift Cable or Linkage: Worn or damaged shift cables or linkage can prevent the car from shifting properly. This is less likely, but possible.
* Visual Inspection: If you're comfortable working under the car, inspect the shift cables and linkage for any obvious damage, fraying, or binding. This will require some knowledge of your car's mechanics.
3. Transmission Problems: While less likely to be the primary cause of just a "stuck in park" issue, internal transmission problems could eventually manifest this way. This is usually accompanied by other transmission problems like slipping, harsh shifting, or noises.
* Other Transmission Symptoms: Do you experience any other issues with the transmission?
4. Electrical Issues: A problem in the car's electrical system controlling the shift interlock can prevent it from working correctly. This could include a blown fuse or a faulty control module.
* Check Fuses: Consult your owner's manual to locate the fuse(s) related to the transmission or shift interlock.
What to Do:
* Start with the Simplest: Check the brake pedal and key position first. These are the easiest things to troubleshoot.
* Consult Your Owner's Manual: Your owner's manual should have diagrams and troubleshooting tips specific to your 2001 Buick Regal.
* Professional Mechanic: If you've tried the basic troubleshooting steps and the problem persists, it's best to take your car to a qualified mechanic for diagnosis and repair. They have the tools and expertise to diagnose more complex issues.
Ignoring the problem could lead to further damage or inconvenience. Get it checked out promptly.
