This information provides repair recommendations and general guidelines for steel classified as Ultra High Strength Dual Phase Steel (Dual Phase Steel with a tensile strength greater than 800 MPa), also known as DPX.
General Motors recommends the following when repairing or replacing this type of steel during collision repair.
Note:
Recommended Repairs:
Special Tools and Equipment

Mild Steel
Frame and UnderbodyRoadside Assistance Program
For U.S.-purchased vehicles, call 1-800-243-8872; (Text Telephone (TTY): 1-888-889-2438).
For Canadian-purchased vehicles, call 1-800-268-6800.
Service is available 24 hours a day, 365 days a year.
Calling for Assistance
When calling Roadside Assistance, have the following information ready:
• ...
Installation Procedure
Align the front side door outer panel.
Verify the fit of the front side door outer panel.
Clamp the front side door outer panel
into position.
Pre-flanging the flange with BO-6396 pliers and BO-6392 tool kit .
Continue to hammer in stages along the hem flanges.
...
SIR Disabling and Enabling
SIR component location affects how a vehicle should be serviced. There are
parts of the SIR system installed in various locations around a
vehicle. To find the location of the SIR components refer to SIR Identification
Views.
There are several reasons for disabling the SIR system, such as re ...