Compressor Air Intake Turbocharger Whine Noise

Engine Mechanical - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5153082

Cause	Correction
Note: 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.
Worn turbocharger bearings	Visually inspect for evidence of compressor wheel to housing contact. If the turbocharger bearings are worn or damaged, inspect for a Generator Replacement or Water Pump Replacement.
Intake system leaks or obstructions	1. With the engine off, pressurize the intake system and inspect for intake manifold leaks. 2. Inspect for obstructions in the intake manifolds.