Sierra 1500 4WD V8-6.0L (2007)
Suspension Travel Bumper: Customer Interest
Suspension - Multiple Noises From Front Of Vehicle
TECHNICAL
Bulletin No.: 10-03-08-002A
Date: November 03, 2010
Subject: Squeak/Creak/Rumble or Rattle Noise Coming from Front of Vehicle During Low Speed Maneuvers in Cold Ambient Temperatures (Enlarge
Upper Inside Diameter (ID) of Strut Jounce Bumper)
Models:
2007-2011 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2011 Chevrolet Avalanche, Silverado LD, Suburban LD, Tahoe
2007-2011 GMC Sierra LD, Sierra Denali, Yukon, Yukon XL LD, Yukon XL Denali
Supercede:
This bulletin is being revised to add the 2011 model year and clarify the text in the Subject, Condition, Cause and Correction. Please discard Corporate
Bulletin Number 10-03-08-002 (Section - 03 Suspension).
Condition
Some customers may comment on a squeak, creak, rumble or rattle noise coming from the front of the vehicle or it may sound like it is coming through
the front of the dash, during low speed maneuvers. The noise may be most noticeable in ambient temperatures of 0°C (32°F) or colder. The noise will
most likely be heard during small to medium suspension travel such as in parking lot maneuvers, over small bumps, or when stopping.
Cause
This condition may be caused by the front strut jounce bumper inside diameter to the piston rod of the strut experiencing a slip/stick condition during
certain cold ambient temperature conditions.
Correction
1. Test drive the vehicle in the same range of ambient temperatures of 0°C (32°F) or colder and the same low speed maneuvers mentioned by the
customer in order to verify the concern.
2. Using Chassis Ears, verify that the noise is most noticeable at the upper strut mount area. The concern may be on one or both sides of the vehicle.
3. By jouncing the vehicle, the noise or vibration can be isolated using a stethoscope, and may possibly be felt in the vicinity.
4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
5. Remove the LH and RH strut assemblies from the vehicle. Refer to Shock Absorber and Spring Assembly Replacement in SI.
6. Disassemble the coil spring and top mount assembly from each strut. Refer to Shock, Shock Component, and/or Spring Replacement in SI.
