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 UnderbodyRemoval Procedure
Warning: Refer to Glass and Sheet Metal Handling Warning in the
Preface section.
Disable the SIR System. Refer to SIR Disabling
and Enabling.
Disconnect the negative battery cable. Refer to Battery Negative Cable
Disconnection and Connection.
Remove the rear side door. Refer to ...
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the brake rotor. Refer to Front Brake Rotor Replacement.
Remove the wheel speed sensor screw (2).
Remove the wheel speed sensor (1) from the steering knuckle.
Remove the wheel drive shaft from the fron ...
Paint Gauges
Paint thickness gauge. measure the total thickness of the vehicle finish. It
is important to accurately measure the thickness of the finish on
each vehicle as the thickness of the finish will vary on each vehicle. Use a
paint gauge before the sanding process in order to accurately
measure how ...