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 UnderbodyDanger, Warnings, and Cautions
Warning messages found on vehicle labels and in this manual describe hazards
and what to do to avoid or reduce them.
Danger indicates a hazard with a high level of risk which will result in serious
injury or death.
Warning or Caution indicates a hazard that could result in injury or death.
WA ...
Door Locks
To lock or unlock the vehicle from outside, use the Remote Keyless Entry (RKE)
transmitter or the key.
From inside the vehicle, use the power door lock switch.
Power Door Locks
: Press to unlock the doors.
: Press to lock the doors.
Safety Locks
The rear door safety locks prevent passenge ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in
the Preface section.
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 Bat ...