it should come on then go off after the self system check
Ok its stuck in security mode
OK, there may be an issue with the security system, but lets try a relearn procedure. It is posted below. Try it an let me know what happens.
30-Minute Relearn Procedure
Use this procedure after replacing any of the following components:
Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to RUN. You must turn the ignition OFF before attempting to start the vehicle.
it is stuck in theft mode the ignition key switch may require replacement...try the relearn first
Loss Of High Speed GMLAN Communications, Intermittent No Crank, IP Gauge Fluctuation, Intermittent Door Lock Cycling, Intermittent Chime Operation, Various IP Warning Lamps Illuminated, Transmission May Not Shift, Communication DTCs U0073, U0100, U0101, U0102, U0109, U0121 or U0140 Set (Repair Backed Out Terminal In Transmission Harness Connector, Repair Open or Shorted GM High Speed LAN Circuits, Open or Shorted Data Link Resistor, Correct Corrosion or Poor Connections in Various Control Module Connectors)
Some customers may comment on any of the following conditions:
Depending on the vehicle, technicians may find one or more of the following High Speed GMLAN Communications DTCs set as Current or History:
These conditions may be caused by, but not limited to, any of the following: