The starter cranks the engine over against compression so it can fire and run.
When you turn the key, the solenoid engages a Bendix gear with the flywheel ring gear, then connects high-current battery power to the motor windings to spin the engine.
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Replacement runs $200–$750 including parts and 0.8-3 hours labor. Exact cost depends on vehicle, parts tier (OEM vs aftermarket), and local labor rate.
Expected lifespan is 100,000-150,000 miles. Driving conditions, climate, and maintenance affect real-world life.
Single click on key turn; Grinding or whirring without crank; Intermittent no-crank; Slow cranking even with good battery; Burning electrical smell.
Most modern starter motors are sealed units that get replaced rather than rebuilt. A shop will diagnose, confirm with a load or output test, then swap the unit and verify operation.
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