Question about 2003 Pontiac Grand Prix
When I go to put my Grand Pix in park and shut off the engine I can not pull the key out and when I go to shift into gear the shift lever will not release out of the locked position, however I 'm able to release manually.
Could this have something to do with the shift lock control switch?
hope you can help
Had the same problem last year. replaced the burned out fuse located in the glove box - BTSI fuse (automatic transaxle **** lock control )
Posted on Jan 17, 2009
Makes sense. Also, look up under the dash, on the "arm" that the brake pedal is mounted on. There should be several switches up there (one of which is probably the shift lock control). Make sure that when you press the pedal down, any switch being pressed by this action is pressed straight and completely. If one of them is out of alignment, it could mean the car can't tell that you're pressing the brake down, and therefore won't let the car out of gear (or won't realize it's in park and will lock the key in the ignition).
Posted on Aug 02, 2008
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Posted on Jan 02, 2017
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The IPC detects a loss of serial data communications with the ECM. 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 the PARK position. The system consists of the following components:
The automatic transmission shift lock control solenoid
The automatic transmission shift lock control switch
With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed 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 be move out of the PARK position.
The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The PCM supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
You need a Tech2 scan tool to diagnose this problem ! possible range sensor !
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