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Q: Truck will not shift out of park.

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Truck is locked in park! and the brake lights do not come on when you press the brakes! Check the fuses for damage, and I bought a brake stop light part from auto zone and still not working.
My car has an automatic transmission.

A: There are a few things to check. Check fuse...

There are a few things to check. Check fuse #9 carefully. Sometimes fuses look ok from the top but are actually blown. Use a multimeter to ensure the fuse has not gone bad.

Also double check the brake pedal switch for proper operation. Again a multimeter can be used to verify that the switch makes contact when the pedal is depressed.

Based on the information you gave, I do not feel that the shift interlock is faulty because your brake lights do not work either. Finally, check the brake's electrical circuit for shorts or opens using a multimeter and the factory service manual to determine which wires have power and which wires are supposed to be a ground. If help is still needed, a certified technician, like one from YourMechanic, will have the tools to fully diagnose your truck's inability to shift out of park.

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