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Automatic Transmission - 4T45-E - Symptom Troubleshooting And Diagnosis
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High Pitch Whine Noise
High Pitch Whine Noise
Checks
Action
DEFINITION: A high pitch whine which will intensify with engine RPM or which is sensitive to the oil pressure.
Oil Pump System
Verify that the noise is internal to the oil pump during a preliminary oil pressure check. An increase in line pressure will vary an oil pump noise.