Shift Interlock Solenoid – GM (20860378)

Shift Interlock Solenoid is an electrically controlled component in the engine or transmission management system. Because the module cross-checks it against other inputs, a fault here often surfaces as a code for a different circuit.

Replace the Shift Interlock Solenoid when a value freezes or drops out intermittently, which usually means an internal fault rather than wiring. Wiggle-testing the harness while watching live data separates the two.

Reference number for the Shift Interlock Solenoid: 20860378. It is filed under Starters & Alternators, and it is the number that has to match the part coming off the vehicle.

Genuine GM part for the Shift Interlock Solenoid. Where the manufacturer has superseded a number, the current reference is the one that ships.