2007 Impala battery is dead. Ignition key will not return to lock, brake pedal won't depress and cannot gear shift out of park. Will not roll out of garage for any maintenance.
Car was not started for about 3 weeks. It did start the other day but no radio, Onstar, or on-dash lights. I drove it about 20 miles round trip and it was off at my destination for about 2 hours. It started again and I returned home. One week later (today) is was dead.
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Park is release by a small solenoid, the solenoid is powered up by the brake light circuit, so if the brake lights don't work due to a bad switch or wiring issue at the switch park will no release. If the brake lights do work then the wiring to the solenoid may be defective or the solenoid is sticking. Every car I have ever worked on has a bypass for the park lock, check your owner's manual for information on bypassing the lock out when this type of problem occurs.
Automatics have a gear shift safety solenoid that locks the gearshift/transmission in park unless the brake pedal is depressed. This is to prevent people from dropping into a gear from park and rolling into traffic or backing up over someone unexpectedly. When you press the brake pedal you should be able to hear a clicking sound coming from under the gear shift lever. If you dont hear the sound then the solenoid may need to be replaced. The other possibility is needing to replace the brake pedal position switch (usually attached to the pedal assembly or behind the brake pedal assembly) which tells the shifter solenoid to activate when the pedal is depressed.
My 2009 Sonata had the same problem, my wife returned home from taking our child to school and was unable to shift into reverse or park, also unable to remove her keys from the ignition when she finally left the car parked in neutral.
Solution: Replaced the faulty BRAKE LIGHT SWITCH actuated by depressing the brake pedal, even though the brake lights still functioned the switch controls numerous functions. Parts total $20.00 Dealer's diagnostic fee: $110.00... yes it still hurts, but it's better than the torque converter going out as a previous poster had mentioned.
If you cannot move the gearshift lever out of P (Park) with ignition in the RUN position and the brake pedal depressed: 1. Apply the parking brake, turn ignition key to LOCK, then remove the key. 2. Insert the key and turn it to OFF. Apply the brake pedal and shift to N (Neutral). This allows the automatic transmission shift lever to be moved from the P (Park) position without the brake pedal depressed. 3. Start the vehicle. If it is necessary to use the above procedure to move the gearshift lever, it is possible that a fuse has blown or the vehicle's brakelamps are not operating properly.
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.
Sounds like the park/brake shift interlock switch is bad.
"An actuator solenoid and module assembly, located on the lower portion
of the steering column, locks the shifter in Park whenever it receives
a signal that the ignition switch is in the ON position. When the
module receives a signal from the Brake On-Off (BOO) switch that
indicates the brake pedal is depressed, it unlocks the shifter so that
it can be shifted out of Park."
It says the most common failures in the system are the fuse and the BOO
switch, and if they are fine, special tools are needed to diagnose.
To disable the system: Apply the parking brake, turn the ignition key
to LOCK, then remove the key. Insert the key and turn it to OFF. Press
the brake pedal. Shift to neutral, start the vehicle and select the