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Start the vehicle and have someone press on the brake pedal.If there are no brake lights this usually indicates the fault is with the brake switch itself needing replaced.
If you do have brake lights what fails and causes this issue here is the shifter assembly.The shifter assembly houses several electronics for your vehicle to operate properly including shifter release from park.The shifter electronics fail and causes this fault here.
These are the two most common causes with either the brake light switch needing replaced ( if there are no brake lights) or the shifter.To help find out for sure the shifter is at fault the codes would need checked/read out with either a fully compatible scan tool that will plug in and can read all computers to see if the shifter is sending a signal at all or if it has any codes set that will help diagnose it as the cause.I have had to replace both before in the past.
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