Clunk/Bang from Rear of Vehicle (Replace Fuel Tank and Reflash PCM)

This bulletin is being revised to remove the 2003 Grand Prix from the models. Please discard Corporate Bulletin Number 04-06-04-066A (Section 06 -- Engine/Propulsion System).

Some customers may comment on a clunk/bang type noise coming from the rear of the vehicle. This noise will be most noticeable when the vehicle comes to a stop or during parking lot maneuvers. Customers may also comment that the noise occurs when the fuel tank is between ½ and full.

The noise may be caused by fuel sloshing around in the fuel tank.

Replace the fuel tank with P/N 15141578. Refer to the Fuel Tank Replacement procedure in the Engine Controls sub-section of the service manual. This new tank has internal baffles to prevent the fuel from sloshing around.

Important: This new fuel tank also requires the PCM to be reflashed with a new service calibration due to revised evaporative characteristics. This new calibration is currently available through TIS2000. As always, make sure your Tech 2® is updated with the latest software version. You will need to call Techline® Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). TCSC will provide a VCI number to allow the vehicle to be updated with the proper calibration.

For vehicles repaired under warranty, use: