Issue with gear selector not unlocking after starting the truck

Hi,

There is what is called a shift lock actuator which prevents the shifter from coming out of park unless the brake is depressed. This actuator is powered by the brake light switch. So, first make sure the brake lights are working when it won't shift.

If you look at the first pic I attached, I circled the park position switch. I suggest to first check to make sure the connection is tight and not damaged or corroded.

______________________

Next, the shift lock cable could be stretched. Here are directions for replacing it. I'm adding it because the directions indicate how to check if it is stretched or bad.

_____________________

2001 Nissan-Datsun Truck Pathfinder SE 4WD V6-3.5L (VQ35)
Procedures
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Shift Interlock Shift Interlock Cable Service and Repair Procedures
PROCEDURES
KEY INTERLOCK CABLE

pic 2

CAUTION:
- Install key interlock cable in such a way that it will not be damaged by sharp bends, twists or interference with adjacent parts.
- After installing key interlock cable to control device, make sure that casing cap and bracket are firmly secured in their positions. If casing cap can be removed with an external load of less than 39.2 N (4.0 kg, 8.8 lb.), Replace key interlock cable with new one.

Removal

pic 3

Unlock slider from adjuster holder and remove rod from cable.

Installation

pic 4

1. Set key interlock cable to steering lock assembly and install lock plate.
2. Clamp cable to steering column and fix to control cable with band.
3. Set selector lever to P position.

Pic 5

4. Insert interlock rod into adjuster holder.

-pic 6

5. Install casing cap to bracket.
6. Move slider in order to fix adjuster holder to interlock rod.

________________________________

Let me know if this helps and what you find. If you have additional questions, feel free to ask.

Take care,
Joe