Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description & Operation: Introduction: Notes
The Brake Transmission Shift Interlock (BTSI) system is a safety device that prevents an inadvertent shift out of PARK when the engine is running.
The shift interlock system prevents driver from moving gearshift lever from PARK position unless ignition switch is turned to ON position. BTSI solenoid inhibits gearshift lever movement from PARK position until simultaneously applying brake pedal with ignition switch turned to ON position. Shift interlock solenoid is located at gearshift lever in steering column or center console.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.