Body/Steering - Clunk From Front of Vehicle on Turns
Bulletin No.: 05-02-35-003Date: June 03, 2005
ADVANCED SERVICE INFORMATION
Subject:
ADVANCED SERVICE INFORMATION - EI-05061 I-Shaft Clunk or Stick-Slip
Models:
2005 Cadillac Escalade, Escalade ESV, Escalade EXT
2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2005 GMC Sierra, Yukon, Yukon XL
Attention:
THIS IS NOT A RECALL. "GM of Canada" dealers are not authorized to use this bulletin. This bulletin ONLY applies to vehicles in which the customer has commented about this concern AND the E1 number shows in GMVIS. All others should disregard this bulletin and proceed with diagnostics found in published service information.
Condition
Important:
If the customer did not bring their vehicle in for this issue, DO NOT proceed with this bulletin. Customers may comment about a "clunk" noise coming from the front of the vehicle.
Correction
GM Engineering is attempting to determine the root cause of I-Shaft replacements. There are three potential areas that may cause the customer's concern. GM Engineering is requesting that the three areas be evaluated before making any repairs. The three areas (listed in no particular order) that may cause the customer's concern are:
^ Body mount at the A-pillar - this noise may be heard mostly during a driving situation in which the body is twisted/flexed (i.e. hitting a pot-hole).
^ Frame - this noise may be heard at the torsion bar crossmember during a turning maneuver.
^ I-Shaft - this noise may be heard when turning at low speeds on rough road surfaces.
To determine the source of the customer's concern, use chassis-ears to evaluate the body mount area and the frame torsion bar cross-member. An I-shaft concern can be felt as a "chucking" feel through the steering wheel. After the chassis-ears are installed, drive the vehicle to evaluate the customer's concern.
If it is determined the cause of the customer's concern is due to the body mount or torsion bar crossmember, proceed with the appropriate repair. If it is determined the cause of the concern is the I-Shaft, contact the following engineers who will want to evaluate the vehicle:
IF IT IS DETERMINED THE CAUSE OF THE CUSTOMER'S CONCERN IS THE I-SHAFT, DO NOT MAKE ANY REPAIRS.
CONTACT ONE OF THE FOLLOWING ENGINEERS WHO WILL COME TO THE DEALERSHIP TO EVALUATE THE CONCERN AND PROVIDE THE TECHNICIAN WITH REPAIR INSTRUCTIONS.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer