Wont start Car cranks fine,even starts,for 2 to 3 seconds then shuts off,[Like an old chrysler with a bad balast resistor],you can hear the fuel pump run for key on prime,and it runs for a second or two after the engine dies.No flashing theft light!, is on but steady.Scanner has DTC for no BCM comunication. Acquired Good ?? used BCM exact same Results!Power is present at the ignition module with the key on and or while cranking,even as the engine shuts off. also tried leaving the key on for 20 min., same results.Vehicle does have after market alarm with remote??

SOURCE: Theft lock 2005 Cobalt

If the BCM has been replaced, the BCM has to be reprogrammed by a dealer as it control many car functions.

SOURCE: 99 chevy cavalier theft system light on steady, car wont crank.

My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!

SOURCE: Chevy S-10 Start problems

If hall effect switch was bad you wouldn't get any spark.What year 2.5L is this?Is this a 2 injector Throttle Body? The pink wire on top of injectors comes thru a 20Amp fuse controlled by the Ignition switch you should have battery voltage with key on The dark green and dark blue wires come from the pcm which are called injector drivers the drivers supply a pulsating ground if you crank the engine with a test light between either pink/dk green or pink/dk blue test light should flash dimmlythat would mean injectors are being driven but there isn't any fuel at the injector or the injectors are bad no pulse means either a bad computer ( which these drivers are known for going bad)or the computer isn't being commanded to fire the injectors.

SOURCE: "Cranks, but won't start". Replaced fuel pump, CKP, ICM & nothing

If the engine cranks over normally when you attempt to start you car, but the engine does not start, the problem may be NO FUEL, NO SPARK or NO COMPRESSION. The engine needs adequate fuel pressure, a properly timed spark and normal compression to start.


1) To find why the engine won't start, remove the air inlet tube from the throttle body, push the throttle open and spray a small amount of aerosol starting fluid into the engine. Crank the engine. If it has spark and compression but NO FUEL, it will start and run a few seconds before dying. If it does NOT start, it probably has NO SPARK.

2)Another method to check for spark is to pull a spark plug wire off of a spark plug (if it has plug wires, coil-on-plug ignitions do not) and place the open end of the plug wire near a metal surface on the engine. Have a helper crank the engine while you watch for a spark. DO NOT hold the wire while doing this as it can shock you. If you see a spark, the problem is not spark, but most likely NO FUEL or NO COMPRESSION. If you do not see a spark, the problem is in the IGNITION CIRCUIT.

3)Proper fuel pressure is critical for fuel injected engines to start and run. You should hear the fuel pump inside the fuel tank buzz for a couple of seconds when the ignition is turned on (no buzz means the pump is not running and the engine is not getting fuel). You can smell the tailpipe for gasoline vapors after cranking the engine. If you smell gas, the problem is likely not fuel but NO SPARK. You can also remove the plastic cap and press the schraeder valve test fitting on the fuel rail to see if there is any fuel pressure to the engine (not a very accurate test because fuel pressure must be at a certain level for the engine to start, for that you need a gauge). Even so, no fuel at the fuel rail would tell you fuel is not getting to the engine..

SOURCE: car wont start. turns over but wont stay running

your cars antitheft system is trying to prevent the car from being stolen so it is shutting it offf after it starts. go back over step by step you installation instructions make sure the ring around the ignition that comes with the remote starter is taped into the exact loacation it needs to be, or the cars own anti theft system will not notice it and will try to shut car off. its an anti theft feature. if this doesn't wotk you will not be able to use this remote starter. i ran into the same problem finally got it to work poperly.