On the Pontiac Grand Prix, the ignition switch and cylinder are just to the right of the steering column. The ignition switch starts the engine when activated by your car key. If the ignition cylinder won't turn, you can troubleshoot it with a few simple tweaks that should get it working again.
Spray the ignition cylinder in your Pontiac Grand Prix with a lubricant such as WD-40 to minimize resistance from metal-on-metal friction. Then, insert your key and try turning the switch to see if it will work. If not, go on to the next step.
Insert a wire into the keyhole to dislodge any loose debris that might be restricting you from inserting and turning the key in the cylinder. Try turning the key again. If the cylinder still won't turn, go on to the next step.
Remove the dashboard panels around the ignition cylinder to see if there is anything impeding the movement of the cylinder. You can remove the panels by popping them off with a straight blade.
Remove and replace the cylinder. You can remove the cylinder by inserting your key and then inserting a straightened paper clip into the small hole just to the left. Turn the key to the "ACC" position and pull out the cylinder. Clean the cylinder and brush away any visible debris. Reinsert the cylinder or install a new ignition switch in place of the old one.
