Have Transmission Questions? Ask a Mechanic for Answers ASAP
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The 2 most common causes are the brake switch and the shift interlock solenoid. Both are part of the BTSI- brake transmission interlock system.
When it doesnt shift out of park, you need to check the brake lights. If they are not working, then it is the brake switch. If they are, it is the shift interlock solenoid at the shifter assembly.
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