2004 chevy venture will not shift from park. The engine is running and the brake pedal is pressed.

spring --damaged clip--debris --need to remove cover to access the bottom of shifter ---and possible shift interlock failure
https://www.youtube.com/watch?v=0LDkoecODII this link shows bypass and fixes

It definitely sounds like you have a bad shifter cable. Not a very expensive part, but can be a pain to get changed.

There is a switch on the brake pedal shaft that releases the lock on the shift lever. Check all the fuses and then check the switch to see if it is loose of defective.

Slide under at the rear of the back axle and pull the ebrake cable back off at the center of the axle,then push the cables into each of the rear wheels to release.

Cars have a locking solenoid that prevents the vehicle from being shifted out of Park when the engine is running if the brake pedal is not pressed. This is to prevent accidental shifting into gear by children left in running cars, or people leaning over the shifter to get to the glove box, etc. Sounds like the solenoid is not being deactivated when the brake pedal is pressed. There is usually a manual release button in case this feature fails, but the button may be inconvenient to access. You could try putting the car in Neutral before trying to start it, since most cars will start in either the Park or Neutral position. This will allow you to use the vehicle until you can diagnose and make repairs.

is it a linkage issue? if the shift lever is working and you can feel the detents, check your fluid make sure it is full and clean, if not you could have internal issues with the trans

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 thew following components:
• The automatic transmission shift lock control solenoid
• The body control module (BCM)
• The powertrain control module (PCM)
With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid receives a ground from the BCM. When the automatic transmission shift lock control solenoid is energized, the shift lever mechanically locked in the PARK position. When the driver presses the brake pedal the PCM sends a class 2 serial data message to the BCM. The BCM turns OFF the ground control circuit and this de-energizes the automatic transmission shift lock control solenoid. When the automatic transmission shift lock control solenoid is de-energized, the shift lever may be moved out of the PARK position. The BCM determines transaxle shift lever position through a class 2 serial data message from the PCM. The PCM receives inputs from the park/neutral position switch and determines shift lever position. When the BCM receives this information and determines that the shift lever is out of the PARK position, the automatic transmission shift lock control solenoid ground is opened.

Do you know what a DTC is ? Diagnostic trouble code !

DTC B2708
The body control module (BCM) controls the automatic transmission shift lock control solenoid. Positive voltage is supplied via the ignition 1 voltage circuit to the automatic transmission shift lock control solenoid. The BCM controls the ground circuit of the automatic transmission shift lock control solenoid . When the brake pedal is depressed, the BCM removes the ground allowing the solenoid to disengage. This action allows the vehicle to be shifted out of the PARK position.
Conditions for Running the DTC
DTC B2707

Your best bet mite be to have a qualified repair shop check it .

Yeah, all cars with automatic transmissions do. Press the brake while shifting from park.

I would say it is a problem with the shift interlock.

The truck should have never come out of park without using the brake pedal. If it did, and the brake lamps worked correctly, chances are the shift interlock solenoid is the problem.

Quick test, with the engine off, turn the key to the run position ( do not start ), press the brake pedal and put into neutral.

If this works correctly, the shift interlock is the problem. Start with checking the fuse.

It's a brake booster switch, Ford cars are notorious for this problem. It's a switch on the brake pedal that detects when your brake pedal is pressed. It's cheap and easy to fix.