GM Service Manual Online
For 1990-2009 cars only

Notice: After performing the system repair, perform the following:

   â€¢ A code clear with a scan tool, regardless of whether or not a DTC is set
   â€¢ A Diesel Particulate Filter (DPF) Service Regeneration with a scan tool
Perform the above in order to remove soot from the DPF and avoid possible DPF failure.