So the engine DOES crank and run if starting fluid is used? Check the injectors and see if there is power to them, they make a noid light that plugs into the harness for this, but a test light can be used. If no power to the injectors check fuses and PCM power and ground. You can try a Passkey relearn if it's the security system.
Have you done a relearn on the pass-key?
GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it
Tuesday, November 12th, 2019 AT 2:56 PM
(Merged)