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Turbocharger Whine Noise

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Turbocharger Whine Noise

Condition Action
Some whine noise is normal. Compare to a known good vehicle.
Leaking charge air cooler/pipes/hoses Inspect for leaks in charge air cooler/pipes/hoses using J 46091  .
Worn turbocharger bearings Visually inspect for evidence of compressor wheel to housing contact.
If the turbocharger bearings are worn or damaged, inspect for a Turbocharger Lack of Oil Supply .
Intake system leaks or obstructions
  1. With the engine off, pressurize the intake system using J 46091  and inspect for intake manifold leaks.
  2. Inspect for obstructions in the intake manifolds.
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