Why won't 2003 pontiac grand prix. shifter come out of park? Shift button will not depress. When pushing on the button and pulling back, the whole shifter raises up but will not come out of park. The key is not stuck in the ignition and it will come out of park when I use the manual shift release. Smacked down on the top of the shifter and then the button depressed and it came out of park. What's the fix? I don't want to have to smack it or use the manual release every time. :)

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05 Jul, 2017

  • 73%
    Solved this issue
  • 100min
    Time to fix
  • 60%
    Recommend to DIY
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Shift - interlock system problem .
Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The automatic transmission park lock solenoid
• The automatic transmission shift lock control switch
• The transmission range switch
With the ignition in the ON position, battery voltage is supplied to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The transmission range switch provides a path to ground for the automatic transmission shift lock control solenoid in the PARK position. With the automatic transmission shift lock control solenoid energized the shift lever is mechanically locked in the PARK position. When the driver presses the brake pedal, the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to move from the PARK position. When the shift lever is out of the PARK position the controlled ground contacts in the transmission range switch open. This prevents the automatic transmission shift lock solenoid from energizing when the vehicle is out of the PARK position.
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