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Why wont a 1998 Tahoe shift out of park having brake light issues and changed the fuse and brake light switch and still no brake lights and now it wont shift out of park?
Many vehicles in that age group were fitted with a safety INTERLOCK which was designed to prevent a driver from taking the transmission selector lever out of "Park" UNLESS their foot was on, and holding, the brake pedal FIRMLY depressed.
This was to prevent the vehicle suddenly "lurching" upon being shifted into a "moving" position.
The interlock safety function was accomplished by using the brake light electrical signal to a type of solenoid locking mechanism on the gear shift selector, or in the transmission.
I suspect that you have what is commonly called an "open circuit condition" in the brake light / safety interlock circuit, and that is what is preventing you from taking the shift lever out of the Park position.
Therefore, once you find and correct the open circuit issue, then the shift lever will become responsive again.
Obviously there are probably several possible causes for the open circuit, and following are a few that come to my mind at the moment.
- A "connector" in the circuit has become "unplugged," or loose
- Corrosion buildup inside on the metal contacts is acting to open the circuit,
- A "conductor" [wire] has become disconnected, broken, or cut,
- The brake light switch is out of proper adjustment,
- The brake light switch has developed an internal failure and is now defective,
- The "interlock" solenoid has become maladjusted or defective.
Again I caution that, as I am not specifically familiar with your vehicle, there could be other causes I haven't listed. Good luck.
What else can I help you with?
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