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Automatic Transmission Shift Lock Control Description and Operation.
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 solenoid (serviced as the automatic transmission shift lock actuator), as well as the body control module (BCM) and the engine control module (ECM). The shift lock solenoid is located within the floor shift control assembly with vehicles equipped with floor shift.
• The BCM controls the voltage supply circuit of the shift lock control solenoid. The following conditions must be met before the BCM will supply voltage to the shift lock control solenoid.
The BCM controls the voltage to the shift lock control solenoid through the shift lock control solenoid controlled voltage circuit. The following conditions must be met before the BCM will supply voltage to the shift lock solenoid:
• The ignition is in the ON position.
• The ECM sends an input via GMLAN serial data to the BCM indicating the transmission is in the PARK position.
• The BCM determines the brake pedal is applied according the brake pedal position.
Since the shift lock control solenoid is permanently grounded, the BCM supplies voltage to the automatic transmission shift lock control solenoid, mechanically unlocking the shift lever allowing the driver to move the shift lever out of the PARK position as the solenoid energizes. When the brake pedal is not applied, the BCM turns the control voltage output of the shift lock control solenoid OFF, de-energizing the shift lock control solenoid. The de-energized solenoid mechanically locks the shift lever in the PARK position.
During remote start operation, the BCM will de-energize the shift lock control circuit, locking the shift lever in the PARK position.
The body control module (BCM) controls the shift lock solenoid by providing battery voltage to the shift lock control solenoid. The BCM utilizes a smart driver to control the voltage supplied to the shift lock solenoid. The smart driver monitors the voltage and current flow of the control circuit.
• Use a scan tool to verify there are no brake pedal position sensor and/or transmission internal mode switch (IMS) DTCs set that could cause the BCM not to provide battery voltage to the A/T shift lock solenoid.
• If the automatic transmission shift lock control circuit is shorted to battery positive voltage, the A/T shift lock solenoid will be inoperative. The vehicle will shift out of PARK without depressing the brake pedal.
Your best bet is have it towed to a repair shop !
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.
Can be several things. There is an interlock for the gearshift which must agree with the brake pedal showing your foot is on the brake. If anything is out of alignment, then the gearshift will not release.
Sometimes if you look at the Brakelight, a sure sign of problems is they refuse to light up when the pedal is pressed. The brake pedal interlock at the top of the brake pedal lever is out of place or broken. Once the switch is restored, everything should work again.
Sometimes if the steering wheel is not lined up, a release pin in the column will not let the interlock move. Tilt columns can often have this problem.
Take a look and see if the brake lights are working,the power to release the shift lock comes from the brake switch when you step on the brake the shifter is unlocked. i had a few of these that needed new brake light switches, first try starting the car and stepping on the brake pedal as hard as you can and then try shifting,if this works replace brak switch, next if that doesnt work check the brake light to see if they work if not or if so check all fuses even under the hood fuse box, hope this helps. here a picture of the shift release soleniod it on the steering column, dissconnect and slide by hand to release shifter until repaired.
mcdevito75 here, When you turn the car off the ignition switch locks the steering wheel, sometimes when you go to start the car it starts but you can"t move the shift lever due to the steering wheel being locked, try this, put the key in the ignition switch, turn the key and at the same time move the steering wheel, if you can move the steering wheel even a 1/2 inch that should free up the shift lever also.
I had this problem and its common on the impala. There is a manual release button under the shifter trim. Remove the trim and look down and on the passenger side you will see a silver button near the bottom. With the shifter in park push in the button and this will release the shifter. You can drive the car as long as you don't put it back in park. If you do just push in the button and release it again. My problem was a broken wire in the shifter cable. You won't find this release button in the owners manual. After mine was repaired I drilled a inch and one half hole in the passenger side of the console opposite the level of the button in case I had future problems. Just reach in with your finger and push in the button to release the shifter.