The serpentine belt drives accessories like the alternator, water pump, A/C compressor, and power steering pump from the crankshaft.
A single continuous ribbed belt routes around pulleys; a spring-loaded tensioner keeps it tight as it stretches with age.
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Replacement runs $120–$400 including parts and 0.5-1.5 hours labor. Exact cost depends on vehicle, parts tier (OEM vs aftermarket), and local labor rate.
Expected lifespan is 60,000-100,000 miles. Driving conditions, climate, and maintenance affect real-world life.
Squealing on start; Visible cracks or missing ribs; Power steering loss; Battery warning; Overheating.
Most modern serpentine belts 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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