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I'm not sure about a Pontiac, but on my mom's Ford Escort it is located under the all the plastic housing where the gear shift is mounted on the floor. It should be located somewhere near your safety interlock override button, as this is attached to the solenoid itself. You can use the override button to bypass the solenoid if it quits working so that you can get at least get your car in gear until you get a chance to replace solenoid.
the brake interlock press on the brake to release it
If the trans. is an automatic, the prob. might be in the trans. shift interlock solenoid. This is a solenoid that prevents shifting into gear unless your foot is on the brake pedal. The solenoid is located on the steering column or under the center console on floor shift models. Check to see if you have any connectors unplugged at these locations, if you do, find where it goes and your problem may go away.
Which gear - 1,2,3,4,5,6???
It ensures that only one gear can be engaged at a time.
reverse gear does not work off a solenoid do you have 2nd and 4th gear or just rev missing
The shifter on automatic transmission cars is interlocked with the brake. You can not take it out of PARK unless you press on the brake pedal. If you are pressing on the brake and it still will not come out of PARK, the interlock solenoid may be bad.
if the shifter does not move the shift interlock may be bad
That clicking noise you hear when you press and release the brake pedal is the "Shift Lock Solenoid" engaging and disengageing. The shift lock solenoid is located below the center console directly underneath the gear shift lever. That sound is normal.
keeps you from putting car in gear unless brakes are pushed. I have been doing that wanting to put the truck in gear but it is not happening. It is still stuck in park.
Sounds like a faulty btsi solenoid (brake transmission shift interlock). Key on push on the brake and listen for a click by the shifter. If no click try wiggling the shifter and pushing forward.
keeps you from putting car in gear unless brakes are pushed. I have been doing that wanting to put the truck in gear but it is not happening. It is still stuck in park.