yeah it is possible the interlock or brake switch may be malfunctioning.
if the actuator is the one at fault then its part number is gm 26097679 and sells for a $75. you likely will not need the fixture too i think it is mainly to hold the column up but is usually not needed.
gc99ckbody_2-162a
A/T Shift Lock Control - Disassemble
DISASSEMBLY PROCEDURE
- Tools Required
- J 41352 Modular Column Holding Fixture
Removed pic
- Set the steering column into J 41352.
Removed pic
- Use a screwdriver to pry the electrical BTSI actuator from the steering column jacket assembly.
A/T Shift Lock Control - Assemble
ASSEMBLY PROCEDURE
- Tools Required
- J 41352 Modular Column Holding Fixture
Removed pic
- Install the electrical BTSI actuator.
- Put the column in the neutral position.
Removed pic
- Adjust the electrical BTSI actuator.
3.1. Pull the tab (1) out on the block side (2) of the electrical BTSI actuator. 3.2. Press on the adjuster block (2) to compress the internal adjuster spring to disengage the adjuster teeth. Slide the adjuster block as far away from the solenoid as possible. 3.3. Lock in place by pushing the tab (1) back in.
- Inspect the electrical BTSI actuator.
4.1. The electrical BTSI actuator must lock the gear shift lever when it is put into the park position. 4.2. When the column is installed in the vehicle you will not be able to shift the gear shift lever out of the park position without pressing on the brake pedal. The solenoid will be energized. 4.3. Readjust if needed.
- Take the column out from J41352.