| Subject: | Information on Very Faint Engine Whine Noise At Speeds of 0-48 KM/H (0-30 MPH) At 1000-2500 RPM On 3.6L LY7 Engine |
| Models: | 2004-2007 Buick Rendezvous |
| 2005-2007 Buick Allure (Canada Only), LaCrosse |
| 2004-2007 Cadillac CTS, SRX |
| with 3.6L V6 Engine (VIN 7 - RPO LY7) |
A very faint engine whine-type noise heard at speeds of 0-48 km/h (0-30 mph) at 1000-2500 RPM may be caused by the primary camshaft drive chain. This type of noise may be amplified by the vehicle's body structure. The noise may be
present at idle (hot or cold) and, in some vehicles, this noise may be louder.
GM Powertrain Engineering states that this type of noise is characteristic and/or normal for this engine. No abnormal engine wear or internal damage will result due to this noise condition.
If an engine whine, whistle or ringing-type noise is heard from the front of the engine and increases in intensity as the engine RPM increases, refer to Corporate Bulletin Number 05-06-01-013B.
An engine noise primarily around 1600 RPM that can be described as a howl will typically be coming from the exhaust system. This is also considered a characteristic and/or normal type of noise.
