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Service bulletin PI-0491

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10039506
Published by NHTSA2011-08-01
Manufacturer's numberPI-0491
Manufacturer's date2011-06-01
NHTSA componentWHEELS

NHTSA's summary

GM: 2006-2011 IMPALA. A CLUNK NOISE IS COMING FROM UNDER THE FRONT OF THE VEHICLE WHEN DRIVING AND/OR WHEN PUTTING THE TRANSMISSION IN DRIVE OR REVERSE. THIS MAY BE CAUSED BY DAMAGED MOUNTING AREAS. THE FRAME CAN SHIFT CAUSING THE CLUNKING NOISE. *RM

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Wheels

Vehicles listed
CHEVROLET IMPALA2006, 2007, 2008, 2009, 2010, 2011

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
25-NA-1562025-12-04. Service bulletin. This service bulletin provides information on Tire Sidewall Irregularities.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
21-NA-0432024-12-10. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
00-03-10-006P2024-05-01. Service bulletin. This service bulletin provides information for dealers/technicians on Tire Radial Force Variation (RFV).
PI0655A2024-04-29. Service bulletin. Information on Removal/Cracking of Stainless Steel Wheel Nut Caps.
17-NA-0522024-04-23. Service bulletin. This bulletin updates the position of General Motors on refinishing aluminum wheels. GM has determined that wheel refinishing under warranty will no longer be performed.
03-00-91-001I2023-11-22. Service bulletin. This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
17-NA-1702023-10-25. Service bulletin. This service bulletin provides information about the Hunter wheel Road Force balancers that should be utilized for all repairs requiring balance and Road Force measurement.
12-03-10-001E2023-06-05. Service bulletin. This service bulletin provides information for dealers/technicians on Vibration Shortly After Tires are Mounted/Preventing Vibration from Wheel Slip (Tire Sliding on Wheel).
17-NA-1702023-05-06. Service bulletin. This service bulletin provides information about the Hunter wheel Road Force balancers that should be utilized for all repairs requiring balance and Road Force measurement.