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
Shift interlock system prevents gearshift lever from being moved from Park unless brake pedal is depressed and accelerator pedal is in idle position. Voltage is provided to shift lock solenoid when ignition is on. In case of a malfunction, gearshift lever can be released by placing ignition key in key release slot near gearshift lever and pushing down. See Fig 1.
Shift interlock system consists of brake pedal position switch, key interlock solenoid and switch, park pin switch, Powertrain Control Module (PCM) and shift lock solenoid. See Fig 2.
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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.