This Preliminary Information communication provides information to the technician about vehicles that may have an erratic idle, idle surge or sag, and other low engine speed drivability concerns, including the potential for stall events that can occur infrequently. Technician should insure he is working on a Tahoe Police Pursuit Vehicles and Special Service Tahoe?s Regular Production Option Code 5W4. Technician will need to reprogram the Engine Control Module and Body Control Module with the latest calibration to correct this concern.
